- linaro-toolchain - lists.linaro.org

Blueprints, Headline and Acceptance criteria for monthly releases

by Mounir Bsaibes

Release Management needs the list of the the blueprints that will be delivered this month. For each bp, they want a Headline and Acceptance criteria. The Headline is a statement to include in the Monthly release announcement. The acceptance criteria is a statement how to verify the work is done. I have collected this month's blueprints in the spreadsheet, please review it for accuracy. If a blueprint you are working on is missing, please add it. The Headline and Acceptance can be added into the whiteboard as follows: Headline: headline text Acceptance: acceptance text Once you add the the headline and acceptance, please modify the spreadsheet to reflect that it is done. https://docs.google.com/a/linaro.org/spreadsheet/ccc?key=0AoZqvK7R1biJdGxSc… Thanks in advance, Mounir -- Mounir Bsaibes Project Manager Follow Linaro.org: facebook.com/pages/Linaro/155974581091106 http://twitter.com/#!/linaroorg http://www.linaro.org/linaro-blog <http://www.linaro.org/linaro-blog>

15 years

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[Activity] Weekly report for w/e 2011-09-09

by Ramana Radhakrishnan

==GCC== ===Progress=== * Fixed https://bugs.launchpad.net/ubuntu/+source/gcc-4.6/+bug/838994 . Investigated Bernd's alternate patch . Will commit mine. * Looked at PR48308 for sometime whihc might be a dup of PR50313 . * Some blueprint foo. * Committed a few of the outstanding approved patches into Linaro GCC-4.6 * Patch review week * Caught up with email after vacation. === Plans === * Commit conditional compares patch. * Commit the patch for LP838994. * Investigate some of the performance issues with strlen and some of the cases with - one of the ideas is to probably try and get the specific testcases run under u-boot or as a bare-metal binary and look at dumps of various performance monitoring counters and see what's happening. * Look at BRANCH_COST and finish that up next. * Dust off patch for PR19599 . One of them them that has fallen into the cracks. * Some patch review. Meetings: * 1-1s * TCWG calls * Thumb2 performance call. Absences. * 16th Oct (pm) - LLVM developer summit - London * 31st Oct - 4th Nov - Linaro Summit Orlando - Travel booked - hotel to be booked. * 08 Nov - 11 Nov - Tentatively booked not approved. * Dec 19 - 31st Dec - Tentatively booked not approved.

15 years

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[ACTIVITY] 5th - 11th September

by Andrew Stubbs

Merged both GCC 4.5 and 4.6 from FSF to Linaro. Matthias requested that I avoid a particular upstream 4.6 commit, so I selected the revision before that as the merge point. The problem was then fixes upstream, and another fix was desirable, so I've redone the merge from the branch head. Another widening-multiplies bug was reported to me (I logged it as pr50318/lp843775), so I've fixed that and committed the fix upstream, and filed a merge request on Launchpad. Finished fixing the bugs in my thumb2 constants optimizations, and backported the new patches to Linaro GCC 4.6. Pushed the updated stuff to Launchpad for testing. Richard Sandiford found a flaw in my patch for pr50193/lp836401, so I've done another version of that and posted it upstream. Ramana didn't like that version. I've started again trying to fix it a different way, but I don't have it working just yet. Continued work on my new constant reuse patch. I have it detecting many constant expressions, and calculating the values for some of them. Once it does that sufficiently well, the next step is to track what constants are available where, I then I'll be in a position to find optimization opportunities. At the moment, 'sufficiently well' could just mean MOVW/MOVT pairs, as those are the most common Tried to get the CS Panda Boards up and running again after the move. No success. Ricardo is on the case. I'm still using the boards located at Canonical. Andrew

15 years

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[ACTIVITY] Weekly status

by Revital Eres

Continue looking at Richard's micro benchmarks taken from libav w.r.t SMS and experiment with different patches that Richard wrote to improve code generation. Submitted SMS related patch for minor misc fixes http://gcc.gnu.org/ml/gcc-patches/2011-09/msg00551.html Trying to understand why to new version of the patch to support instructions with REG_INC_NOTE in SMS causes bootstrap failure. Will email to the ml regarding it. (http://gcc.gnu.org/ml/gcc-patches/2011-08/msg01216.html)

15 years

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[ACTIVITY] Weekly status

by Richard Sandiford

* Looked at LP bug 736661. Sent a patch upstream. Some positive feedback, but it hasn't been approved or rejected yet. * Looked at the old R_ARM_THM_CALL linker bug, after Matthias prepared a self-contained testcase (thanks). Attached a patch to the bug. Will submit upstream next week if testing goes OK. * Looked at why the backport of lp823708-4.5 retriggered the same bootstrap failure that Chung-Lin's patch did. Haven't been able to reproduce yet. * Looked at making the neon_vget_high/low patterns use ordinary subreg moves. Found that this triggered a fair few latent bugs in the rtl optimisers. Tried to fix those. This gave some nice improvements in some of the libav loops. * Added h264 loops to the libav microbenchmarks. * Blueprints. * Upstream patch review. Richard

15 years

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[ACTIVITY] w36

by Asa Sandahl

* Completed First-time wiki page, at least for now. Expecting to add more information as I go. * Running SPEC2K on the Snowball board. The tests are failing because I run out out of memory. This is due to too little RAM available in the default kernel configuration. (Official HW pack.) I had a go with creating a swap file on the SD-card. The tests are then running, but results are slow (which makes sense). Will try to make more memory available with changed uboot-option, or with a fresh kernel. * Discussing with Michael about benchmark candidates that will add a web browsing perspective to the benchmarks we have. I suggest Sunspider and V8 benchmark suite for the JavaScript aspect, and EEMBC Browsing Bench and perhaps ARMBBench for the load and render aspect. As for the imaging aspect we have DENBench and ConsumerBench. Best Regards Åsa

15 years

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GCC Trunk r178719 fails to build

by Michael Hope

For reference, trunk r178719 fails to build in an A9 or ARMv5 configuration: http://builds.linaro.org/toolchain/gcc-4.7~svn178719/logs/armv7l-natty-cbui… The error is: /scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/./prev-gcc/g++ -B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/./prev-gcc/ -B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/install/armv7l-unknown-linux-gnueabi/bin/ -nostdinc++ -B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/src/.libs -B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/libsupc++/.libs -I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/include/armv7l-unknown-linux-gnueabi -I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/include -I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/gcc-4.7~/libstdc++-v3/libsupc++ -L/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/src/.libs -L/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/libsupc++/.libs -c -g -O2 -gtoggle -DIN_GCC -W -Wall -Wwrite-strings -Wcast-qual -Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common -DHAVE_CONFIG_H -I. -I. -I../../../gcc-4.7~/gcc -I../../../gcc-4.7~/gcc/. -I../../../gcc-4.7~/gcc/../include -I../../../gcc-4.7~/gcc/../libcpp/include -I../../../gcc-4.7~/gcc/../libdecnumber -I../../../gcc-4.7~/gcc/../libdecnumber/dpd -I../libdecnumber insn-peep.c -o insn-peep.o ../../../gcc-4.7~/gcc/config/arm/arm.md: In function 'const char* output_319(rtx_def**, rtx)': ../../../gcc-4.7~/gcc/config/arm/arm.md:10636:78: error: unknown conversion type character '(' in format [-Werror=format] ../../../gcc-4.7~/gcc/config/arm/arm.md:10636:78: error: unknown conversion type character ')' in format [-Werror=format] /scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/./prev-gcc/g++ -B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/./prev-gcc/ -B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/install/armv7l-unknown-linux-gnueabi/bin/ -nostdinc++ -B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/src/.libs -B/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/libsupc++/.libs -I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/include/armv7l-unknown-linux-gnueabi -I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/include -I/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/gcc-4.7~/libstdc++-v3/libsupc++ -L/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/src/.libs -L/scratch/cbuild/slave/slaves/ursa4/gcc-4.7~svn178719/gcc/default/build/prev-armv7l-unknown-linux-gnueabi/libstdc++-v3/libsupc++/.libs -c -g -O2 -gtoggle -DIN_GCC -W -Wall -Wwrite-strings -Wcast-qual -Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common -DHAVE_CONFIG_H -I. -I. -I../../../gcc-4.7~/gcc -I../../../gcc-4.7~/gcc/. -I../../../gcc-4.7~/gcc/../include -I../../../gcc-4.7~/gcc/../libcpp/include -I../../../gcc-4.7~/gcc/../libdecnumber -I../../../gcc-4.7~/gcc/../libdecnumber/dpd -I../libdecnumber insn-preds.c -o insn-preds.o cc1plus: all warnings being treated as errors -- Michael

15 years

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[ACTIVITY] 2011-09-09

by David Gilbert

== String routines == * Trying to understand my strlen behaviour that Michael identified - Found lots of ways of making the faster case slower, but none of making the slower case faster! - Perf not being available on Panda (bug 702999/843628) made it difficult to dig down * Fixing standards corner cases for strchr/memchr - input match needs to be truncated to char (fixes bug 842258 & 791274) * Tidying up formatting for cortex-strings release * Looking at eglibc integration again - getting confused by what has to happen in config.sub and how other users of it cope with triplets like armv7 even though it's not in config.sub == QEMU == * Testing Peter's QEMU release - All good - Lost a few hours due to the broken version of l-i-f-ui in Oneiric - PPA version works OK * A little bit of perf profiling == Other == * Managed to get hold of a nice fast build machine

15 years

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[ACTIVITY] Sep 5 - Sep 9

by Ulrich Weigand

== GDB == * Worked on hardware watchpoint support for gdbserver. == GCC == * Analyzed root cause of three more ICEs when building Linux kernel with mainline GCC (reported by Arnd): PR target/50305: Inline asm reload failure when building Linux kernel PR middle-end/50307: SSA checking ICE when building Linux kernel PR tree-optimization/50318: ICE optimizing widening multiply-and-accumulate * Implemented proposed fix for PR target/50305 and posted for review. == Misc == * Installed updated FPGA bitfiles on my Versatile Express and verified that network stability issues (LP #673820) are now fixed. * Booked Linaro Connect Q4.11 travel. Mit freundlichen Gruessen / Best Regards Ulrich Weigand -- Dr. Ulrich Weigand | Phone: +49-7031/16-3727 STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E. IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Martin Jetter | Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht Stuttgart, HRB 243294

15 years

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[ACTIVITY] report week 36

by Peter Maydell

RAG: Red: Amber: Green: overrunning OMAP3 upstreaming work (mostly) replanned Current Milestones: || || Planned || Estimate || Actual || ||qemu-linaro 2011-09 || 2011-09-15 || 2011-09-15 || || Historical Milestones: ||qemu-linaro 2011-04 || 2011-04-21 || 2011-04-21 || 2011-04-21 || ||qemu-linaro 2011-05 || 2011-05-19 || 2011-05-19 || n/a || ||close out 1105 blueprints || 2011-05-28 || 2011-05-28 || 2011-05-19 || ||complete 1111 planning || 2011-05-28 || 2011-05-28 || 2011-05-27 || ||qemu-linaro-2011-06 || 2011-06-16 || 2011-06-16 || 2011-06-16 || ||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || 2011-07-21 || ||qemu-linaro 2011-08 || 2011-08-18 || 2011-08-18 || 2011-08-18 || == upstream-omap3-patches == * more reshuffling of patches and dropping of unnecessary changes (eg code reformatting) * we're going to divide this blueprint into four, each of which has a reasonably clearly defined submilestone and an estimated 3 engineering weeks of work in it * in order to not have work on this completely push out other items on the schedule, we're going to limit work done on this to 2 or 3 days each week * still todo: actually split the blueprint, set dates for submilestones, check that other blueprints fit reasonably in the other half-week == linaro-qemu-11.11 == * built a pre-release tarball and tested it -- looks good for next week's release * investigated whether we can reinstate the firmware blobs in our releases (bringing us back into line with upstream) -- should be possible but need to go through the license approval process since some are GPLv3 == a15-system-mode-planning == * starting to see some (gentle) pressure for A15 support * thinking about what we should do here; my current opinion is that QEMU should implement an "A15 without virtualization or LPAE" -- we have Linux kernels that will boot on this, and it is essentially what an A15-on-A15 hw virt guest would see. The device work will be needed for KVM anyway. Need to write this up. == other == * submitted TSC licensing request to add the firmware blobs back into our qemu-linaro tarballs, in line with how upstream do releases * I need to track better how much time I'm spending on things like code review on qemu-devel, minor bug fixing and other things that aren't blueprints * all holiday to the end of the year now booked (see below) Current qemu patch status is tracked here: https://wiki.linaro.org/PeterMaydell/QemuPatchStatus Absences (to end of year): Sep 19, Sep 29-Oct 07, Oct 17, Nov 21, Dec 15-Jan 03: leave Oct 30-Nov 04: Linaro Connect Q4.11

15 years

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[ACTIVITY] weekly status

by Ken Werner

Hi, * I've been setting up a new system because the old laptop died * finished the initial port of libunwind for Android on ARM * changed debuggerd to make use of libunwind to unwind the stack of crashing applications * it works and the output looks great :) * I plan to document these things in the wiki by next week Regards Ken

15 years

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Added h264 loops to libav microbenchmarks

by Richard Sandiford

Just as an FYI, I've added these loops to the libav microbenchmarks avg-h264-chroma-mc8-8.txt avg-pixels8-8.txt ff-h264-idct-add-8-8.txt ff-put-pixels8x16-8.txt h264-loop-filter-luma-8.txt idct-internal-8.txt put-h264-chroma-mc8-8.txt put-h264-qpel8-h-lowpass-8.txt put-h264-qpel8-hv-lowpass-8.txt put-h264-qpel8-v-lowpass-8.txt based on Michael's h264 profile. These loops: decode_residual ff_h264_decode_mb_cavlc fill_decode_caches aren't really the kind of thing that the microbenchmark is designed for; running the whole h264 benchmark is probably a better test. Some of the functions in the profile just consist of two copies of a simpler loop, one after the other, so for those I just used the simpler loop. Usual microbenchmark caveats apply. Richard

15 years

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SMS wiki page

by Revital Eres

Hi, Following our last performance meeting; I started a wiki page which describes how to use SMS: https://wiki.linaro.org/WorkingGroups/ToolChain/UsingSMS Thanks, Revital

15 years

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[ACTIVITY] September 4-8

by Ira Rosen

Hi, * merged vector over-promotion patch to linaro-gcc-4.6 * committed upstream the change of the default vector size for NEON * continued working on widening shifts Ira

15 years

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Benchmarking / justifying cortex-strings

by Michael Hope

Hi Dave. I've been hacking away and have checked in a couple of benchmarking and plotting scripts to lp:cortex-strings. The current results are at: http://people.linaro.org/~michaelh/incoming/strings-performance/ All are done on an A9. The results are very incomplete due to how long things take to run. I'll leave ursa3 doing these over the weekend which should flesh this out for the other routines. Your new memcpy() is looking good as well - as fast as GLIBC. -- Michael

15 years

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Vectorised copy

by Michael Hope

While out benchmarking today, I ran across code similar to this: int *a; int *b; int *c; const int ad[320]; const int bd[320]; const int cd[320]; void fill() { for (int i = 0; i < 320; i++) { a[i] = ad[i]; b[i] = bd[i]; c[i] = cd[i]; } } I was surprised and happy to see the vectoriser kick in for the copy. The inner loop looks like: add r5, r3, ip adds r4, r3, r7 vldmia r2!, {d16-d17} vldmia r1!, {d18-d19} adds r0, r3, r6 vst1.32 {q9}, [r5] vst1.32 {q8}, [r4] vldmia r3, {d16-d17} adds r3, r3, #16 cmp r3, r8 vst1.32 {q8}, [r0] bne .L3 so r3 is the loop variable and {ip,r7} are the offsets from r3 to the destination pointers. Adding a __restrict doesn't change the code. Richard, will your auto-inc/dec changes combine the final vldmia r3, add r3 into a vldmia r3! ? Changing the int *a into in-file arrays like int a[320] gives: vldmia r0!, {d16-d17} vldmia r5!, {d18-d19} vstmia r4!, {d18-d19} vstmia r1!, {d16-d17} vldmia r2!, {d16-d17} vstmia r3!, {d16-d17} cmp r3, r6 bne .L2 Marking them as extern int a[320] goes back to the first form. Can we always use the second form? What optimisation is preventing it? -- Michael

15 years

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Re: Memcpy and memset

by Michael Hope

On Fri, Sep 2, 2011 at 4:51 AM, David Gilbert <david.gilbert(a)linaro.org> wrote: > Hi Michael, > I've just committed a pair of memcpy's into src/linaro-a9 - memcpy.S > that is armv7 > and memcpy-hybrid.S that is a Neon hybrid which uses neon for non-aligned cases > and for large (128K or larger) copies. I've also (accidentally) > wired the memcpy-hybrid > one into the Makefile.am (I wasn't sure what the right way to do this > was - the neon_sources > seemed a good place for it, but there is nothing currently in there > that turns off the non-neon > version). > > I'd be interested in seeing the results for both; I've got a bit of > a soft spot for the hybrid > solution. > > On the memset, yes the 'and' that you added is fine - but I started > having a play and have > some performance results (on -t 128) that I don't really understand: > > > 1) and r1,#0xff > orr r1,r1,r1,lsl#8 > orr r1,r1,r1,lsl#16 > > That's your solution - and fastest at somewhere around 2270MB/s for > me - by the TRM I reckon > that should be 3 cycles. > > 2) lsls r1,#24 > orr r1,r1,r1,lsr#8 > orr r1,r1,r1,lsr#16 > > lsl isn't explicitly listed in the TRM, so I assumed that was the > same as a move with a constant > shift, which my reading is that it's a single cycle; and the lsls is 2 > bytes - so you would think > that should be as fast as yours but 2 bytes smaller - except it's > reliably down at 2228MB/s - so > it is slower. > > 3) Thinking it was an alignment issue I tried adding a mov r5,r1 to > the front of that, and got 2248MB/s - > so being faster with an extra instruction it probably was an alignment issue? > > 4) I also tried a pair of bfi's: > bfi r1,r1, #8, #8 > bfi r1,r1, #16, #16 > > That came out at 2228MB/s - and is 4 cycles by the book. Unfortunately you can't tell the performance from the latency. Attached is a micro benchmark that has the three different versions (and, ubx, lsl). After compensating for the loop time, I got: * lsl: 1.006 s * ubx: 0.876 s * and: 0.918 s even though ubx has a latency of two cycles. I then took the AND version and shifted it to the start of the file. This small change in alignment pushed it up to 1.048 s which is 14 % slower. -- Michael

15 years

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Agenda - performance call - 2011-09-06

by Ramana Radhakrishnan

Hi, I've put a draft agenda for tomorrow's call at https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2011-09-06 Is there something else folks would like to add to this ? Follow-up on the cortex-strings discussion from today's call ? cheers Ramana

15 years

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[ACTIVITY] 29th - August - 3rd September

by Andrew Stubbs

* Linaro GCC Fixed up, committed and posted two bug fixes to my thumb2 constants patches, found by other people running FSF trunk. Analysed bug lp:836401 / pr50193, developed a fix, and posted it both upstream and to launchpad for testing. The launchpad tests have come back clean, and the patch is approved, but upstream have not approved it yet. Posted a query to linaro-dev mailing list asking for ARM CPU ID register numbers, and got lots back. Entered these into the patch, and begun some test builds. I will post the new verion upstream, if all's well, next week. Started looking at an optimization I discussed with Richard Earnshaw in Cambourne, in which GCC attempts to synthesize constants more efficiently by reusing constant values already in registers. I've made a start, but not much more to say just yet. * Other - Public holiday Monday. - Half day leave on Wednesday. - Internal train session

15 years

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[ACTIVITY] Weekly status

by Revital Eres

Continue looking at Richard's micro benchmarks w.r.t SMS. Examining Ayal's comments to the patch to support instructions with REG_INC_NOTE in SMS. (http://gcc.gnu.org/ml/gcc-patches/2011-08/msg01216.html) Took one day off yestarday (4/9)

15 years

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Csmith

by Andrew Stubbs

Do we know anything about "Csmith"? Maybe we should try it? Andrew -------- Original Message -------- Subject: Re: [PATCH][ARM] pr50193: ICE on a | (b << negative-constant) Date: Thu, 1 Sep 2011 13:21:38 +0000 (UTC) From: Joseph S. Myers <joseph(a)codesourcery.com> To: Andrew Stubbs <ams(a)codesourcery.com> CC: gcc-patches(a)gcc.gnu.org, patches(a)linaro.org Newsgroups: gmane.comp.gcc.patches References: <4E5F6B5F.2020207(a)codesourcery.com> On Thu, 1 Sep 2011, Andrew Stubbs wrote: > This patch fixes the problem by merely checking that the constant is positive. > I've confirmed that values larger than the mode-size are not a problem because > the compiler optimizes those away earlier, even at -O0. Do you mean that you have observed for some testcases that they get optimized away - or do you have reasons (if so, please state them) to believe that any possible path through the compiler that would result in a larger constant here (possibly as a result of constant propagation and other optimizations) will always result in it being optimized away as well? If it's just observation it would be better to put the complete check in here. Quite of few of the Csmith-generated bug reports from John Regehr have involved constants appearing in unexpected places as a result of transformations in the compiler. It would probably be a good idea for someone to try using Csmith to find ARM compiler bugs (both ICEs and wrong-code); pretty much all the bugs reported have been testing on x86 and x86_64, so it's likely there are quite a few bugs in the ARM back end that could be found that way. -- Joseph S. Myers joseph(a)codesourcery.com

15 years

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[ACTIVITY] weekly status

by Ken Werner

Hi, libunwind: * improvements in case the user doesn't use ARM unwind tables but DWARF info * code used to pick ARM unwind from the crt files which says "cantunwind" android: * upgraded working base to 11.08 * continue to port libunwind to android * noticed a header file clash that causes errors * finished an android app that uses a native part to crash the process * as a vehicle to test the modified debuggerd Regards Ken

15 years

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[ACTIVITY] Sep 1 - Sep 2

by Ulrich Weigand

== GDB == * Russell King now wants to revert my kernel patch that fixed #615974; discussed alternative options. == GCC == * Patch review week. * Analyzed root cause of ICE when building Linux kernel with mainline GCC (reported by Arnd). Mit freundlichen Gruessen / Best Regards Ulrich Weigand -- Dr. Ulrich Weigand | Phone: +49-7031/16-3727 STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E. IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Martin Jetter | Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht Stuttgart, HRB 243294

15 years

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[ACTIVITY] 2011-09-02

by David Gilbert

== QEmu == * Sent 64bit atomic helper fix upstream * Basic boot time and simple benchmarks v Panda board * Tested prebuilt images and Peter's latest post-merge QEmu tree - The full Ubuntu desktop on an emulated Overo is a bit slow - it's rather short on RAM - The full Ubuntu desktop on an emulated VExpress isn't bad; it's got the full 1G; (with particularly grim line of awk to mount vexpress images based on Peter's suggestion of the use of 'file') == String routines == * Pushed memcpy and memset up to cortex-strings bzr * Working through memset issue with Michael - Made my code a little less sensitive to initial alignment == Hard float == * Testing libffi 3.0.11rc1 - still hasn't got variadic patch in, but hopeing it will land later in the cycle. == Other == * Excavating inbox after week off. * Build LMbench and kicked run off on Panda. (Got stuck in some heuristics under emulation) Dave

15 years

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[ACTIVITY] report week 34

by Peter Maydell

(short week; bank holiday on Monday) RAG: Red: Amber: OMAP3 patch upstreaming is (still) slower progress than hoped Green: Current Milestones: || || Planned || Estimate || Actual || ||qemu-linaro 2011-09 || 2011-09-15 || 2011-09-15 || || Historical Milestones: ||qemu-linaro 2011-04 || 2011-04-21 || 2011-04-21 || 2011-04-21 || ||qemu-linaro 2011-05 || 2011-05-19 || 2011-05-19 || n/a || ||close out 1105 blueprints || 2011-05-28 || 2011-05-28 || 2011-05-19 || ||complete 1111 planning || 2011-05-28 || 2011-05-28 || 2011-05-27 || ||qemu-linaro-2011-06 || 2011-06-16 || 2011-06-16 || 2011-06-16 || ||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || 2011-07-21 || ||qemu-linaro 2011-08 || 2011-08-18 || 2011-08-18 || 2011-08-18 || == upstream-omap3-patches == * omap_gpmc patches were committed upstream * cleaned up and sent usb related patches upstream (accepted) * converted omap interrupt controller to qdev and MemoryRegions, submitted to upstream * went through the patchstack trying to classify the patches in it as a first step in reestimating/replanning this epic blueprint == other == * submitted patches doing some minor cleanup of versatile platform following MemoryRegion conversion * submitted a ppc-host compilation fix patch (accepted) * submitted minor cleanup patch removing an unused makefile target Current qemu patch status is tracked here: https://wiki.linaro.org/PeterMaydell/QemuPatchStatus Absences: Oct 30-Nov 04: Linaro Connect Q4.11

15 years

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[ACTIVITY] Weekly status

by Richard Sandiford

== This week == * Looked at the get_arm_condition_code ICE. Seems to be a popular bug: was reported as #589887 #823708 and #809761 in Lauchpad and as PR49030 in bugzilla. Sent a patch upstream. * Submitted SMS register-dependency patch upstream. * Reviewed Bernd's new shrink-wrap patch. * Tried to clean up my microbenchmarks. Found that preloading the caches at the start of the benchmark fixed the variations I was seeing on a Beagleboard. (As Dave says, it seems that there's no allocation on write.) Added code to check the results of each loop. Packaged it up and pushed into bzr. * An IBM colleague kindly tried my -fsched-pressure patch/hack on s390. Although it performed the best of the three runs (trunk, -fsched-pressure, patch+-fsched-pressure), there were some disappointing outliers. -fsched-pressure still introduces a 7% regression in one test (down from a 14% regression without the patch). Another test benefited from -fsched-pressure without my patch but regressed with it. == Next week == * Look more at SMS. * Look more at the sched-pressure thing (if I get time). Richard

15 years

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[ACTIVITY] w35

by Asa Sandahl

* SPEC2K week. Experimented with building and running and finally did a full run on the Panda board. * Running SPEC2K on the Snowball board as well. It is troublesome to work with the board because of the ethernet problem that makes the board freeze after some time. I have to use the SD-card for file transfer. It seems to be a known issue on the Snowball V3. Tested a V5 board which was much more stable. Have asked for a V5 board from ST-E Linaro internal project manager. (Do not know when I will get it.) * Preliminary travel booking done for Linaro Connect in Orlando. Best Regards Åsa

15 years

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libav-based microbenchmarks in bzr

by Richard Sandiford

I've tried to clean up the libav microbenchmarks that I did for the strided load/store stuff. They're on Launchpad at: lp:~rsandifo/+junk/loop-microbenchmarks The main changes are that the benchmarks now preload the caches (for CPUs that don't allocate on write) and that they now check the optimised loop against an unoptimised one. The usual big caveat applies: these loops were chosen because they were affected by strided load/stores. They aren't necessarily interesting for any other reason, and some were even explicitly marked as cold. I'm going to add some of the video decode routines from Michael's benchmark soon. These microbenchmarks aren't supposed to be libav-specific though, so if you have other interesting ones, please do add them. Richard

15 years

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Trip report: KVM Forum/LinuxCon NA 2011

by Peter Maydell

Trip report: KVM Forum/LinuxCon NA 2011 KVM Forum is an annual conference; this year it was colocated with LinuxCon NA in Vancouver. There were about 150 attendees; many of them are simply users of KVM and so many of the talks are aimed at KVM users. However it's also an opportunity for the KVM and QEMU developer community to get together, with a number of informal BoF sessions and an all-day hackathon later in the week. The talk schedule is here, together with the slides for all talks: http://www.linux-kvm.org/page/KVM_Forum_2011 Some brief highlights: * Keynotes ARM/Linaro got positive mentions in both keynotes; Avi Kivity said of the ARM/A15 KVM work that he had "every reason to expect it to be very successful". Anthony Liguori's keynote summarising the year in QEMU development included some statistics about commits: Linaro came third in the list of "companies with most commits", behind only Red Hat and IBM; I came top of the "individual authors with most commits" list, being apparently responsible for 7% of all QEMU patches this year :-) * KVM on POWER/PPC There were several talks about KVM on PPC architectures; interestingly this is seeing use not just on the server end but also in the embedded/realtime space (including a talk from Freescale where they said they are working on KVM on embedded PPC because of customer demand for KVM). It was also reassuring to see that another architecture has preceded us in shaking out x86-isms from KVM. * KVM Tool This has got headlines recently as a potential replacement for the userspace launcher/device model role which QEMU currently plays when starting guest OSes under KVM. It's intended to be minimal and lightweight and only to run Linux guests (with paravirtualised devices for most purposes). The general reaction seemed to be that although the implementation is currently minimal it will become larger and bloatier as they add features off their wishlist. There's also some ill-feeling about the effective namespace grab of calling the userspace binary "kvm". From an ARM-centric point of view we can just wait and see whether it gets much traction. Possibly it may turn into a testbed for technology which is easier to develop on than the 'mature' QEMU which has to deal with backwards compatibility and supporting users. * QEMU Object Model and Device Model issues and redesign For me one of the most important strands of conversation at the conference was replacing QEMU's device model abstraction with something better. QEMU's current device model abstraction is "qdev"; this is the (vaguely object-oriented) framework which lets you create devices, configure them and connect them together. It models the world as a tree: a root device exposes a bus, to which child devices can connect; those child devices may expose further buses, and so on. This works quite well in the PC world where mostly you're interested in plugging in USB devices, PCI cards, etc; it is rather less well matched to the embedded board models where things are much less hierarchical. qdev's major flaws include: + insists on bus hierarchy, but not everything is a bus, and in any case there are often several trees (memory transactions, clock, interrupts) which don't necessarily coincide + no support for composition ("device foo is actually devices bar and baz glued into one box") + just barely supports having devices expose signal (gpio/irq) lines and memory regions (typically registers), but doesn't let you give them useful names, so you have to access them by index number We spent just about all of Thursday's hacking session going through this. I felt we got good agreement on the problems, and perhaps 80-90% agreement on Anthony Liguori's proposed new QEMU Object Model as a solution to them; some loose ends still need to be worked through. * LinuxCon NA KVM Forum was colocated with LinuxCon NA this year. My opinion (which seemed to be shared with the other Linaro attendees I talked to about it) was that LinuxCon NA suffered from being not very technical and not very focused -- it wasn't clear to me who they thought their target audience was. A few points of interest: + Linus Torvalds' keynote was reported in some places as more complaints about ARM hardware but I actually thought it was pretty positive about the progress we're making in sorting out the issues + Matthew Garrett's talk about x86 platform drivers (those things that deal with LEDs, funny keys, batteries and other odd laptop hardware) revealed that actually PC hardware manufacturers do just as much random non-standard undocumented silliness, it's just that accident of history has limited them to only doing so in the minor bits at the edges... -- PMM

15 years

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request for gdb testing

by Nicolas Pitre

Hello Ulrich (or anyone else acquainted with gdb), Could the gdb test suite be run on a kernel with the below patch applied please? A confirmation that this patch doesn't regress gdb is required before this can move ahead. Quick feedback would be greatly appreciated. Thanks. ---------- Forwarded message ---------- Date: Thu, 25 Aug 2011 15:55:58 +0100 From: Russell King - ARM Linux <linux(a)arm.linux.org.uk> To: Tejun Heo <tj(a)kernel.org>, Arnd Bergmann <arnd(a)arndb.de>, Mark Brown <broonie(a)opensource.wolfsonmicro.com> Cc: Rafael J. Wysocki <rjw(a)sisk.pl>, linux-kernel(a)vger.kernel.org, linux-arm-kernel(a)lists.infradead.org Subject: Re: try_to_freeze() called with IRQs disabled on ARM On Thu, Aug 25, 2011 at 03:09:07PM +0200, Tejun Heo wrote: > Hey, Russell. > > If you can fix it properly without going through temporary step, > that's awesome. Let's put the arguments behind, okay? Here's the patch. As the kernel I've run this against doesn't have the change to try_to_freeze(), I added a might_sleep() in do_signal() during my testing to verify that it fixes Mark's problem (which it does.) I've tested functions returning -ERESTARTSYS, -ERESTARTNOHAND and -ERESTART_RESTARTBLOCK, all of which seem to behave as expected with signals such as SIGCONT (without handler) and SIGALRM (with handler). I haven't tested -ERESTARTNOINTR. I don't have a test case for the race condition I mentioned (which is admittedly pretty difficult to construct, requiring an explicit signal, schedule, signal sequence) but this should plug that too. How do we achieve this? Effectively the steps in this patch are: 1. Undo Arnd's fixups to the syscall restart processing (but don't worry, we restore it in step 3). 2. Introduce TIF_SYS_RESTART, which is set when we enter signal handling and the syscall has returned one of the restart codes. This is used as a flag to indicate that we have some syscall restart processing to do at some point. 3. Clear TIF_SYS_RESTART whenever ptrace is used to set the GP registers (thereby restoring Arnd's fixup for his gdb testsuite problem - it would be good if Arnd could reconfirm that.) 4. When we setup a user handler to run, check TIF_SYS_RESTART and clear it. If it was set, we need to set things up to return -EINTR or restart the syscall as appropriate. As we've cleared it, no further restart processing will occur. 5. Once we've run all work (signal delivery, and rescheduling events), and we're about to return to userspace, make a final check for TIF_SYS_RESTART. If it's still set, then we're returning to userspace having not setup any user handlers, and we need to restart the syscall. This is mostly trivial, except for OABI restartblock which requires the user stack to be written. We have to re-enable IRQs for this write, which means we have to manually re-check for rescheduling events, abort the restart, and try again later. One of the side effects of reverting Arnd's patch is that we restore the strace behaviour which we've had for years on ARM, and can still be seen on x86: strace can see the -ERESTART return codes from the kernel syscalls, rather than what seems to be the signal number: Before: rt_sigsuspend([] <unfinished ...> --- SIGIO (I/O possible) --- <... rt_sigsuspend resumed> ) = 29 sigreturn() = ? (mask now []) vs: rt_sigsuspend([]) = ? ERESTARTNOHAND (To be restarted) --- SIGIO (I/O possible) @ 0 (0) --- sigreturn() = ? (mask now []) x86: rt_sigsuspend([]) = ? ERESTARTNOHAND (To be restarted) --- {si_signo=SIGIO, si_code=SI_USER} (I/O possible) --- sigreturn() = ? (mask now []) So, this patch should fix: 1. The race which I identified in the signal handling code (I think x86 and other architectures can suffer from it too.) 2. The warning from try_to_freeze. 3. The unanticipated change to strace output. Arnd, can you test this to make sure your gdb test case still works, and Mark, can you test this to make sure it fixes your problem please? Thanks. arch/arm/include/asm/thread_info.h | 3 + arch/arm/kernel/entry-common.S | 11 ++ arch/arm/kernel/ptrace.c | 2 + arch/arm/kernel/signal.c | 209 ++++++++++++++++++++++++------------ 4 files changed, 155 insertions(+), 70 deletions(-) diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h index 7b5cc8d..40df533 100644 --- a/arch/arm/include/asm/thread_info.h +++ b/arch/arm/include/asm/thread_info.h @@ -129,6 +129,7 @@ extern void vfp_flush_hwstate(struct thread_info *); /* * thread information flags: * TIF_SYSCALL_TRACE - syscall trace active + * TIF_SYS_RESTART - syscall restart processing * TIF_SIGPENDING - signal pending * TIF_NEED_RESCHED - rescheduling necessary * TIF_NOTIFY_RESUME - callback before returning to user @@ -139,6 +140,7 @@ extern void vfp_flush_hwstate(struct thread_info *); #define TIF_NEED_RESCHED 1 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ #define TIF_SYSCALL_TRACE 8 +#define TIF_SYS_RESTART 9 #define TIF_POLLING_NRFLAG 16 #define TIF_USING_IWMMXT 17 #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ @@ -147,6 +149,7 @@ extern void vfp_flush_hwstate(struct thread_info *); #define TIF_SECCOMP 21 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) +#define _TIF_SYS_RESTART (1 << TIF_SYS_RESTART) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S index b2a27b6..e922b85 100644 --- a/arch/arm/kernel/entry-common.S +++ b/arch/arm/kernel/entry-common.S @@ -45,6 +45,7 @@ ret_fast_syscall: fast_work_pending: str r0, [sp, #S_R0+S_OFF]! @ returned r0 work_pending: + enable_irq tst r1, #_TIF_NEED_RESCHED bne work_resched tst r1, #_TIF_SIGPENDING|_TIF_NOTIFY_RESUME @@ -56,6 +57,13 @@ work_pending: bl do_notify_resume b ret_slow_syscall @ Check work again +work_syscall_restart: + mov r0, sp @ 'regs' + bl syscall_restart @ process system call restart + teq r0, #0 @ if ret=0 -> success, so + beq ret_restart @ return to userspace directly + b ret_slow_syscall @ otherwise, we have a segfault + work_resched: bl schedule /* @@ -69,6 +77,9 @@ ENTRY(ret_to_user_from_irq) tst r1, #_TIF_WORK_MASK bne work_pending no_work_pending: + tst r1, #_TIF_SYS_RESTART + bne work_syscall_restart +ret_restart: #if defined(CONFIG_IRQSOFF_TRACER) asm_trace_hardirqs_on #endif diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c index 2491f3b..ac8c34e 100644 --- a/arch/arm/kernel/ptrace.c +++ b/arch/arm/kernel/ptrace.c @@ -177,6 +177,7 @@ put_user_reg(struct task_struct *task, int offset, long data) if (valid_user_regs(&newregs)) { regs->uregs[offset] = data; + clear_ti_thread_flag(task_thread_info(task), TIF_SYS_RESTART); ret = 0; } @@ -604,6 +605,7 @@ static int gpr_set(struct task_struct *target, return -EINVAL; *task_pt_regs(target) = newregs; + clear_ti_thread_flag(task_thread_info(target), TIF_SYS_RESTART); return 0; } diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c index 0340224..42a1521 100644 --- a/arch/arm/kernel/signal.c +++ b/arch/arm/kernel/signal.c @@ -649,6 +649,135 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, } /* + * Syscall restarting codes + * + * -ERESTARTSYS: restart system call if no handler, or if there is a + * handler but it's marked SA_RESTART. Otherwise return -EINTR. + * -ERESTARTNOINTR: always restart system call + * -ERESTARTNOHAND: restart system call only if no handler, otherwise + * return -EINTR if invoking a user signal handler. + * -ERESTART_RESTARTBLOCK: call restart syscall if no handler, otherwise + * return -EINTR if invoking a user signal handler. + */ +static void setup_syscall_restart(struct pt_regs *regs) +{ + regs->ARM_r0 = regs->ARM_ORIG_r0; + regs->ARM_pc -= thumb_mode(regs) ? 2 : 4; +} + +/* + * Depending on the signal settings we may need to revert the decision + * to restart the system call. But skip this if a debugger has chosen + * to restart at a different PC. + */ +static void syscall_restart_handler(struct pt_regs *regs, struct k_sigaction *ka) +{ + if (test_and_clear_thread_flag(TIF_SYS_RESTART)) { + long r0 = regs->ARM_r0; + + /* + * By default, return -EINTR to the user process for any + * syscall which would otherwise be restarted. + */ + regs->ARM_r0 = -EINTR; + + if (r0 == -ERESTARTNOINTR || + (r0 == -ERESTARTSYS && !(ka->sa.sa_flags & SA_RESTART))) + setup_syscall_restart(regs); + } +} + +/* + * Handle syscall restarting when there is no user handler in place for + * a delivered signal. Rather than doing this as part of the normal + * signal processing, we do this on the final return to userspace, after + * we've finished handling signals and checking for schedule events. + * + * This avoids bad behaviour such as: + * - syscall returns -ERESTARTNOHAND + * - signal with no handler (so we set things up to restart the syscall) + * - schedule + * - signal with handler (eg, SIGALRM) + * - we call the handler and then restart the syscall + * + * In order to avoid races with TIF_NEED_RESCHED, IRQs must be disabled + * when this function is called and remain disabled until we exit to + * userspace. + */ +asmlinkage int syscall_restart(struct pt_regs *regs) +{ + struct thread_info *thread = current_thread_info(); + + clear_ti_thread_flag(thread, TIF_SYS_RESTART); + + /* + * Restart the system call. We haven't setup a signal handler + * to invoke, and the regset hasn't been usurped by ptrace. + */ + if (regs->ARM_r0 == -ERESTART_RESTARTBLOCK) { + if (thumb_mode(regs)) { + regs->ARM_r7 = __NR_restart_syscall - __NR_SYSCALL_BASE; + regs->ARM_pc -= 2; + } else { +#if defined(CONFIG_AEABI) && !defined(CONFIG_OABI_COMPAT) + regs->ARM_r7 = __NR_restart_syscall; + regs->ARM_pc -= 4; +#else + u32 sp = regs->ARM_sp - 4; + u32 __user *usp = (u32 __user *)sp; + int ret; + + /* + * For OABI, we need to play some extra games, because + * we need to write to the users stack, which we can't + * do reliably from IRQs-disabled context. Temporarily + * re-enable IRQs, perform the store, and then plug + * the resulting race afterwards. + */ + local_irq_enable(); + ret = put_user(regs->ARM_pc, usp); + local_irq_disable(); + + /* + * Plug the reschedule race - if we need to reschedule, + * abort the syscall restarting. We haven't modified + * anything other than the attempted write to the stack + * so we can merely retry later. + */ + if (need_resched()) { + set_ti_thread_flag(thread, TIF_SYS_RESTART); + return -EINTR; + } + + /* + * We failed (for some reason) to write to the stack. + * Terminate the task. + */ + if (ret) { + force_sigsegv(0, current); + return -EFAULT; + } + + /* + * Success, update the stack pointer and point the + * PC at the restarting code. + */ + regs->ARM_sp = sp; + regs->ARM_pc = KERN_RESTART_CODE; +#endif + } + } else { + /* + * Simple restart - just back up and re-execute the last + * instruction. + */ + setup_syscall_restart(regs); + } + + return 0; +} + +/* * Note that 'init' is a special process: it doesn't get signals it doesn't * want to handle. Thus you cannot kill init even with a SIGKILL even by * mistake. @@ -659,7 +788,6 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, */ static void do_signal(struct pt_regs *regs, int syscall) { - unsigned int retval = 0, continue_addr = 0, restart_addr = 0; struct k_sigaction ka; siginfo_t info; int signr; @@ -674,32 +802,16 @@ static void do_signal(struct pt_regs *regs, int syscall) return; /* - * If we were from a system call, check for system call restarting... + * Set the SYS_RESTART flag to indicate that we have some + * cleanup of the restart state to perform when returning to + * userspace. */ - if (syscall) { - continue_addr = regs->ARM_pc; - restart_addr = continue_addr - (thumb_mode(regs) ? 2 : 4); - retval = regs->ARM_r0; - - /* - * Prepare for system call restart. We do this here so that a - * debugger will see the already changed PSW. - */ - switch (retval) { - case -ERESTARTNOHAND: - case -ERESTARTSYS: - case -ERESTARTNOINTR: - regs->ARM_r0 = regs->ARM_ORIG_r0; - regs->ARM_pc = restart_addr; - break; - case -ERESTART_RESTARTBLOCK: - regs->ARM_r0 = -EINTR; - break; - } - } - - if (try_to_freeze()) - goto no_signal; + if (syscall && + (regs->ARM_r0 == -ERESTARTSYS || + regs->ARM_r0 == -ERESTARTNOINTR || + regs->ARM_r0 == -ERESTARTNOHAND || + regs->ARM_r0 == -ERESTART_RESTARTBLOCK)) + set_thread_flag(TIF_SYS_RESTART); /* * Get the signal to deliver. When running under ptrace, at this @@ -709,19 +821,7 @@ static void do_signal(struct pt_regs *regs, int syscall) if (signr > 0) { sigset_t *oldset; - /* - * Depending on the signal settings we may need to revert the - * decision to restart the system call. But skip this if a - * debugger has chosen to restart at a different PC. - */ - if (regs->ARM_pc == restart_addr) { - if (retval == -ERESTARTNOHAND - || (retval == -ERESTARTSYS - && !(ka.sa.sa_flags & SA_RESTART))) { - regs->ARM_r0 = -EINTR; - regs->ARM_pc = continue_addr; - } - } + syscall_restart_handler(regs, &ka); if (test_thread_flag(TIF_RESTORE_SIGMASK)) oldset = &current->saved_sigmask; @@ -740,38 +840,7 @@ static void do_signal(struct pt_regs *regs, int syscall) return; } - no_signal: if (syscall) { - /* - * Handle restarting a different system call. As above, - * if a debugger has chosen to restart at a different PC, - * ignore the restart. - */ - if (retval == -ERESTART_RESTARTBLOCK - && regs->ARM_pc == continue_addr) { - if (thumb_mode(regs)) { - regs->ARM_r7 = __NR_restart_syscall - __NR_SYSCALL_BASE; - regs->ARM_pc -= 2; - } else { -#if defined(CONFIG_AEABI) && !defined(CONFIG_OABI_COMPAT) - regs->ARM_r7 = __NR_restart_syscall; - regs->ARM_pc -= 4; -#else - u32 __user *usp; - - regs->ARM_sp -= 4; - usp = (u32 __user *)regs->ARM_sp; - - if (put_user(regs->ARM_pc, usp) == 0) { - regs->ARM_pc = KERN_RESTART_CODE; - } else { - regs->ARM_sp += 4; - force_sigsegv(0, current); - } -#endif - } - } - /* If there's no signal to deliver, we just put the saved sigmask * back. */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/

15 years

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[ACTIVITY] Aug 31 - Sep 1

by Ira Rosen

Hi, - catching up with the mail - fixed GCC PR50178 - prepared a patch to fix vectorizer dumps Ira

15 years

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how to properly enable multilib builds?

by Matthias Klose

Hi, the current gcc-4.6 packages build for both softfp and hard, so that the armel and (not yet existing) armhf packages can be installed together in the system. To enable multilib, I currently use the rather complicated arm-multilib.diff, which works, but doesn't seem to be correct. With the much simpler arm-ml2.diff, the directory for the default multilib is not resolved to . (as done for e.g. amd64). [amd64] $ gcc -print-multi-directory . [armel] $ gcc -print-multi-directory sf If I understand the code correctly, this comes from the hard setting of MULTILIB_DEFAULTS in the arm target. If you look at mips, you see #ifndef MULTILIB_DEFAULTS #define MULTILIB_DEFAULTS \ { MULTILIB_ENDIAN_DEFAULT, MULTILIB_ISA_DEFAULT, MULTILIB_ABI_DEFAULT } #endif which records the proper selected defaults. Should something similiar be done for arm? Matthias

15 years, 1 month

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request for testing: qemu-linaro git tree

by Peter Maydell

Hi; I've just completed a tricky rebase of qemu-linaro on upstream; there were several invasive upstream changes which have landed recently and which meant that I had to tweak a lot of the qemu-linaro patches as I did the rebase. I've tested the results but it's possible that some breakage may have slipped through... So if you're a regular user of qemu-linaro's system mode and feel like checking the sources out of git: git://git.linaro.org/qemu/qemu-linaro.git building them and testing that the things you regularly do with it haven't regressed, then I'd appreciate it, and you can help us avoid any nasty surprises in the next (2011.09) release. Thanks! -- Peter Maydell

15 years, 1 month

2
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GCC trunk fails to build

by Michael Hope

See: http://builds.linaro.org/toolchain/gcc-4.7~svn178154 The problem is -Werror triggering on: ../../../gcc-4.7~/gcc/config/arm/arm.c: In function 'int optimal_immediate_sequence_1(rtx_code, long long unsigned int, four_ints*, int)': ../../../gcc-4.7~/gcc/config/arm/arm.c:2690:46: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare] ../../../gcc-4.7~/gcc/config/arm/arm.c:2690:60: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare] ../../../gcc-4.7~/gcc/config/arm/arm.c:2691:20: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare] ../../../gcc-4.7~/gcc/config/arm/arm.c:2691:34: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare] ../../../gcc-4.7~/gcc/config/arm/arm.c:2701:16: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare] ../../../gcc-4.7~/gcc/config/arm/arm.c:2702:18: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare] ../../../gcc-4.7~/gcc/config/arm/arm.c:2703:18: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare] -- Michael

15 years, 1 month

2
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[ACTIVITY] 22nd - 27th August

by Andrew Stubbs

Booked hotel and travel for Linaro Connect in Orlando. Fixed a couple of bugs in my thumb2 constants patch and retested. The test results came back clean, so I've committed it upstream. Bernd claimed he has found some test failures that might be caused by my patch, but I couldn't reproduce them at first. I've now got the failure, but I've not yet investigated the cause. Next week ... Committed my widening multiplies patches to Linaro GCC, after first convincing Richard Sandiford that it wasn't totally bonkers. Started work on ARM GCC tuning options: * Submitted a patch for -m{arch,cpu,tune}=native http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg14225.html * Submitted a patch for -m{arch,cpu,tune}=generic-armv7-a http://www.mail-archive.com/gcc-patches@gcc.gnu.org/msg14231.html Joseph found an issue with those patches, but that was easily resolved and I've reposted both.

15 years, 1 month

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[ACTIVITY] Weekly status

by Revital Eres

Continue looking at Richard's micro benchmarks w.r.t SMS. Wrote a new version to the patch to support instructions with REG_INC_NOTE in SMS. (http://gcc.gnu.org/ml/gcc-patches/2011-08/msg01216.html)

15 years, 1 month

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[ACTIVITY] report week 34

by Peter Maydell

RAG: Red: Amber: OMAP3 patch upstreaming is (still) slower progress than hoped Green: Current Milestones: || || Planned || Estimate || Actual || ||qemu-linaro 2011-09 || 2011-09-15 || 2011-09-15 || || Historical Milestones: ||qemu-linaro 2011-04 || 2011-04-21 || 2011-04-21 || 2011-04-21 || ||qemu-linaro 2011-05 || 2011-05-19 || 2011-05-19 || n/a || ||close out 1105 blueprints || 2011-05-28 || 2011-05-28 || 2011-05-19 || ||complete 1111 planning || 2011-05-28 || 2011-05-28 || 2011-05-27 || ||qemu-linaro-2011-06 || 2011-06-16 || 2011-06-16 || 2011-06-16 || ||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || 2011-07-21 || ||qemu-linaro 2011-08 || 2011-08-18 || 2011-08-18 || 2011-08-18 || == upstream-omap3-patches == * finished the fairly nasty rebase of qemu-linaro onto upstream master (several invasive changes went into master that meant a number of our local patches needed updating) * omap_gpmc changes cleaned up, updated to use MemoryRegions, and submitted to upstream (17 patch patchset) == gsoc-support == * final meeting/evaluation writeup now the GSoC project has ended * we now have a first pass at what some upstream-acceptable versions of the Android goldfish platform devices might look like, and a much better idea of the degree of difference between the android and upstream qemu trees, and where the pitfalls/issues lie == other == * fixed some breakage upstream in n810 and integratorcp models caused by landing of MemoryRegion changes * trying to write up what my preferred model of device connections would look like in concrete C implementation terms * interesting discussion on boot-architecture list about how boot loaders should start hypervisor-aware software (xen, kvm kernel): http://www.mail-archive.com/boot-architecture@lists.linaro.org/msg00053.html Current qemu patch status is tracked here: https://wiki.linaro.org/PeterMaydell/QemuPatchStatus Absences: Oct 30-Nov 04: Linaro Connect Q4.11

15 years, 1 month

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[ACTIVITY] Weekly status

by Richard Sandiford

== This week == * Wrote some patches to make SMS schedule register moves. They made a significant difference to some libav loops. I'm running a regression test on pwoerpc-ibm-aix5.3.0 and will submit upstream next week if all goes OK. * Looked at why mjpegenc was so much worse with SMS. Turned out to be a register spilling problem. Found that -fira-algorithm=priority avoids the regression and makes several other tests better too. (I just tested that to see whether there was a feasible register allocation for these cases; -fira-algorithm=priority isn't the way to go.) * Saw that the register allocator seemed to be tripping over the XImode "structure" values, and that we still had one vector move per structure element by the time we get to the scheduling passes. Eliminated those with a combination of one fix and one hack. It seemed to avoid the allocation problems. * Patch review (Linaro and upstream). * Backported libgcc visibility fix to 4.6 and 4.5. == Next week == * Submit register-scheduling patch. * Submit memory cost patch (from auto-inc-dec changes) * Possibly submit the auto-inc-dec changes themselves, depending on how the rtx cost discussion goes. Richard

15 years, 1 month

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[Activity] Week ending 2011-08-26

by Ramana Radhakrishnan

==GCC== ===Progress=== * Looked at the vectorize_with_neon_quad failure again and decided that I had to handle another case but not convinced that the extra stall we'd get in this case was worth it. In any case it would have been a workaround but Richard Sandiford fixed this by getting df to do the right thing which would have been the right fix. * Backported tbh patch. * Backported conditional execution improvements patch from Jiangning to Linaro 4.6 branch. * Committed the LTO + Neon / Android intrinsics patch. * Panda seems more reliable this week but I suspect that's the room cooling more . * Broke up a few blueprints and marked some as done. * BRANCH_COST results show not a huge variation in SPEC and there are some results that are inconsistent.. Need to run a few benchmarks again Sigh :( . * Finished the A9 scheduler patch for smull and friends and committed upstream and into Linaro 4.6. * Reviewed the shrink-wrapping patch and the widening multiplies patch for a short duration. * Looked at the failures in the "popular embedded benchmark" for sometime with Asa. * Tried one of the ICE patches and that seemed to work just fine with bootstrap on FSF trunk. Need to figure out why this was breaking in the Linaro 4.6 tree. https://bugs.launchpad.net/gcc-linaro/+bug/689887 === Plans === Next Week - Holiday :) Feet not up but walking in what looks like typical bank holiday weather ... Might check email later in the week. Meetings: * 1-1s * TCWG calls * Thumb2 performance call. Absences. * 29th Aug - Sept. 2 - Holiday booked and approved. * 31st Oct - 4th Nov - Linaro Summit Orlando - Travel booked - hotel to be booked.

15 years, 1 month

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[ACTIVITY] 21th - 26th August

by Asa Sandahl

* Investigated the errors in the automotive test and concluded that they are CRC-errors, but not depending on the test case result (non intrusive crc check). We decided these errors need to be cleared out once and for all. Michael and Ramana helping out with continued investigation. * EEMBC run on both Panda and Snowball with gcc4.5.2. Results look reasonable, but Michael will also have a look. I will spend a little more time comparing the results from the two boards. * Started to run SPEC2K on the Panda board. Best Regards Åsa

15 years, 1 month

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Effect of SMS register move scheduling

by Richard Sandiford

Following on from yesterday's call about what it would take to enable SMS by default: one of the problems I was seeing with the SMS+IV patch was that we ended up with excessive moves. E.g. a loop such as: void foo (int *__restrict a, int n) { int i; for (i = 0; i < n; i += 2) a[i] = a[i] * a[i + 1]; } would end up being scheduled with an ii of 3, which means that in the ideal case, each loop iteration would take 3 cycles. However, we then added ~8 register moves to the loop in order to satisfy dependencies. Obviously those 8 moves add considerably to the iteration time. I played around with a heuristic to see whether there were enough free slots in the original schedule to accomodate the moves. That avoided the problem, but it was a hack: the moves weren't actually scheduled in those slots. (In current trunk, the moves generated for an instruction are inserted immediately before that instruction.) I mentioned this to Revital, who told me that Mustafa Hagog had tried a more complete approach that really did schedule the moves. That patch was quite old, so I ended up reimplementing the same kind of idea in a slightly different way. (The main functional changes from Mustafa's version were to schedule from the end of the window rather than the start, and to use a cyclic window. E.g. moves for an instruction in row 0 column 0 should be scheduled starting at row ii-1 downwards.) The effect on my flawed libav microbenchmarks was much greater than I imagined. I used the options: -mcpu=cortex-a8 -mfpu=neon -mfloat-abi=softfp -mvectorize-with-neon-quad -fmodulo-sched -fmodulo-sched-allow-regmoves -fno-auto-inc-dec The "before" code was from trunk, the "after" code was trunk + the register scheduling patch alone (not the IV patch). Only the tests that have different "before" and "after" code are run. The results were: a3dec before: 500000 runs take 4.68384s after: 500000 runs take 4.61395s speedup: x1.02 aes before: 500000 runs take 20.0523s after: 500000 runs take 16.9722s speedup: x1.18 avs before: 1000000 runs take 15.4698s after: 1000000 runs take 2.23676s speedup: x6.92 dxa before: 2000000 runs take 18.5848s after: 2000000 runs take 4.40607s speedup: x4.22 mjpegenc before: 500000 runs take 28.6987s after: 500000 runs take 7.31342s speedup: x3.92 resample before: 1000000 runs take 10.418s after: 1000000 runs take 1.91016s speedup: x5.45 rgb2rgb-rgb24tobgr16 before: 1000000 runs take 1.60513s after: 1000000 runs take 1.15643s speedup: x1.39 rgb2rgb-yv12touyvy before: 1500000 runs take 3.50122s after: 1500000 runs take 3.49887s speedup: x1 twinvq before: 500000 runs take 0.452423s after: 500000 runs take 0.452454s speedup: x1 Taking resample as an example: before the patch we had an ii of 27, stage count of 6, and 12 vector moves. Vector moves can't be dual issued, and there was only one free slot, so even in theory, this loop takes 27 + 12 - 1 = 38 cycles. Unfortunately, there were so many new registers that we spilled quite a few. After the patch we have an ii of 28, a stage count of 3, and no moves, so in theory, one iteration should take 28 cycles. We also don't spill. So I think the difference really is genuine. (The large difference in moves between ii=27 and ii=28 is because in the ii=27 schedule, a lot of A--(T,N,0)-->B (intra-cycle true) dependencies were scheduled with time(B) == time(A) + ii + 1.) I also saw benefits in one test in a "real" benchmark, which I can't post here. Richard

15 years, 1 month

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Turn on SMS by default on ARM

by Revital Eres

Hello, Following today performance call (https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2011-08-23) here are some points raised regarding the steps towards enabling SMS by default: * Benchmarks testing: -- Running benchmarks as EEMBC and SPEC2006 with SMS enabled is crucial to expose loops where SMS degrades the performance. those loops need to be analysed to construct a cost model. -- SMS increases code size by introducing prologue and epilogue to the loop kernel. This should also be measured. -- Measure increase in compile time: on native or cross build? Currently SMS fails to bootstrap trunk on ARM machine. this should also be taken into account when considering enabling it by default. Should it be turned on with -O2 or -O3? SMS flags to use for testing: -O3 -fmodulo-sched-allow-regmoves -fmodulo-sched -funsafe-loop-optimizations -fno-auto-inc-dec Thanks, Revital

15 years, 1 month

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Generic Linux cross toolchain for tests

by Marcin Juszkiewicz

Hi Some time ago we agreed that not everyone here uses Ubuntu distribution and decided to provide so called 'generic linux' cross toolchain. Recently I managed to get it done and now need brave testers to tell is it working or not. Get it here: http://people.linaro.org/~hrw/generic-linux/ (64bit only) Needed files are toolchain-11.07.tar.xz and init.sh script. Unpack tarball from / so /opt/linaro/11.07/ will be populated and put init.sh anywhere you want (it will be integrated into tarball later). How to use: $ source init.sh this will add cross toolchain into PATH and also set LD_LIBRARY_PATH to two directories: - one with binutils libraries - second with all extra libraries which may be needed Feel free to experiment with second dir by removing files from there and checking are system provided libs are fine too. So far I checked this toolchain under few distributions: - Ubuntu 10.04 'lucid' LTS - Ubuntu 11.04 'natty' - Fedora 14 - OpenSUSE 11.4 - CentOS 5.6 It failed only under CentOS (which was expected due to it's age). How did I checked? So far compilation of 'gpm' and 'zlib' were tested.

15 years, 1 month

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[Activity] Weekly status - w/e 19th August 2011

by Ramana Radhakrishnan

==GCC== ===Progress=== * Continue to look at the test failure with mvectorize-with-neon-quad. Should be able to commit the backend workaround in on Monday . * Having some problems getting my panda board working reliably. I'm not sure if its the temperature or what but when it gets hot in the office as it was on Tuesday keeping it working reliably is hard. The board locks up and then crashes quite often. * Looked at VFP moves again for some more time. * Committed tbh range change. * Committed fixes for PR50022 === Plans === * Finish off VFP moves patch. * Look at BRANCH_COST results. * Breakdown the T2 performance blueprints into smaller blueprints. * Backport tbh range changes to Linaro 4.6 * Test the intrinsics patch once with some more intrinsics tests and then merge it in to Linaro gcc 4.6 Meetings: * 1-1s * TCWG calls Absences. * 29th Aug - Sept. 2 - Holiday booked and approved. * 31st Oct - 4th Nov - Linaro Summit Orlando - Travel booked - hotel to be booked.

15 years, 1 month

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perf call tomorrow.

by Ramana Radhakrishnan

Hi, I've put up the agenda for tomorrow's call here. https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2011-08-23 Please feel free to add to the agenda if there's something we want to bring up for discussion. cheers Ramana

15 years, 1 month

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[ACTIVITY] report week 33

by Peter Maydell

RAG: Red: Amber: OMAP3 patch upstreaming is slower progress than hoped Green: Current Milestones: || || Planned || Estimate || Actual || ||qemu-linaro 2011-08 || 2011-08-18 || 2011-08-18 || 2011-08-18 || Historical Milestones: ||qemu-linaro 2011-04 || 2011-04-21 || 2011-04-21 || 2011-04-21 || ||qemu-linaro 2011-05 || 2011-05-19 || 2011-05-19 || n/a || ||close out 1105 blueprints || 2011-05-28 || 2011-05-28 || 2011-05-19 || ||complete 1111 planning || 2011-05-28 || 2011-05-28 || 2011-05-27 || ||qemu-linaro-2011-06 || 2011-06-16 || 2011-06-16 || 2011-06-16 || ||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || 2011-07-21 || == linaro-qemu-11.11 == * made final release * some work on build failures on some obscure platforms (ppc, etc) == other == * attended KVM Forum / LinuCon NA -- some very productive discussions/ arguments/etc with other qemu developers. Full trip report to follow * travel/accommodation for Linaro Connect Q4.11 now booked * submitted pullreq for misc. ARM devboard device model fixes (pl110, pl061, etc) : now committed Current qemu patch status is tracked here: https://wiki.linaro.org/PeterMaydell/QemuPatchStatus Absences: Oct 30-Nov 04: Linaro Connect Q4.11

15 years, 1 month

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GCC 4.6 merge

by Andrew Stubbs

Hi all, I'm having real trouble here :( I just can't seem to get bzr to work! I've tried to branch gcc-linaro/4.6 again and again, and it just won't. My other machine refuses to do the merge from lp:gcc/4.6, presumable because the bzr on there is too old. I'm stuck. Can anybody else do the merge from upstream? I'm going to keep trying. Andrew

15 years, 1 month

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[ACTIVITY] 15th - 19th August

by Andrew Stubbs

* GCC Completed merging GCC 4.5 from FSF to Linaro. Spun release tarballs for Linaro GCC 4.5 and 4.6. Uploaded them to Michael's server, and kicked off the test builds remotely. Submitted expenses for Linaro Connect. Finally (!) committed my widening multiplies patches to FSF. :) Continued trying to figure out what's wrong with my thumb2 constants patches. I think I have identified a possible flaw, but I'm having trouble reproducing the problem as I have been unable to pin down a specific constant/expression combination that makes it through all the other optimizations intact, and triggers the problem. I've not run out of idea yet though ... * Other On leave all day Wednesday. Prepared for the big CodeSourcery to Mentor switch-over by moving all my work-in-progress data over to the new servers.

15 years, 1 month

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[ACTIVITY] Weekly status

by Revital Eres

Looked at Richard's micro benchmarks w.r.t SMS. Addressed Ayal's comments to the patch to support instructions with REG_INC_NOTE in SMS. (http://gcc.gnu.org/ml/gcc-patches/2011-08/msg01216.html)

15 years, 1 month

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[ACTIVITY] 2011-08-19

by David Gilbert

== String routines == * Working through updating my eglibc patch for memchr, I think I'm nearly there - took way too long to persuade an eglibc make check to work cross (can't get native build happy). == QEMU == * Sent a new version of my QEMU patch for the atomic helpers to Peter. * Tested the Android beagle image on a real beagle - it fails in pretty much the same way as the QEMU run. == Other == * Had a brief look at bug 825711 - scribus ftbfs on ARM - this is QT being built to define qreal as float on ARM when it's double on most other things, scribus having a qreal variable and something it's defined as a double and then passing it to a template that requires two arguments of the same type; not really sure which one is to blame here! I'm on holiday next week. Dave

15 years, 1 month

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[ACTIVITY] Aug 15 - Aug 19

by Ulrich Weigand

== GDB == * Created and published Linaro GDB 7.3 2011-08 release. * Analyzed --with-sysroot=remote: testsuite failures, and opened bug LP #829595. * Reviewed Yao's latest Thumb-2 displaced stepping patch. == Schedule == * I'll be on vacation 08/23 through 08/31. Mit freundlichen Gruessen / Best Regards Ulrich Weigand -- Dr. Ulrich Weigand | Phone: +49-7031/16-3727 STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E. IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Martin Jetter | Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht Stuttgart, HRB 243294

15 years, 1 month

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[ACTIVITY] weekly status

by Ken Werner

Hi, * continued to work on getting libunwind support for remote unwinding upstream * reworked some of the code to address concerns from the ml * now upstream! * made smaller fixes to have another libunwind testcase passing * interfaced with the Linaro Android group to solve an issue where a compile was failing when using -O3 * turned out that the Linaro GCC vectorizes a loop by generating some neon instructions * unfortunately the gas of the 2.20.1 binutils (that is currently used by the Linaro Android toolchain) doesn't properly understand the alignment restrictions of the generated asm code and throws an error * this has be fixed upstream and using a gas from recent binutils fixes the issue * Bernhard is already working on getting newer binutils in their Androuid toolchain build system * continued the work to get libunwind building on Linaro Android * wrote an Android.mk and got an initial libunwind.so built (ugly hacks involved) * next step is modify the debuggerd to make use of libunwind.so Note: Next week I'll be on vacation. Regards Ken

15 years, 1 month

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[ACTIVITY] Weekly status

by Richard Sandiford

== This week == * Looked at LP #823711. Turned out to be a problem with symbol visibility in libgcc.a. Tested a fix that was accepted and applied upstream. Will backport to upstream release branches, so we should be able to pull the fix in that way. * Backported the fix for BZ PR49987 to Linaro 4.6 and 4.5. * Looked at the regrename bug that Ramana reported on gcc@. * Looked at why libav wasn't being vectorised. Discussed with Ira. I think we now have a Plan. * Submitted address writeback scheduling patches upstream. * Submitted and applied some tweaks to the rtx cost interface upstream. * Spent a while trying to figure out what the targetm.rtx_costs API actually is, and how rtx_cost should use it to evaluate the cost of a SET. Discussed on gcc@. * Found that ARM was giving SETs a base cost of 4 instructions. Benchmarked the cost of "fixing" this. It generally seemed positive. * Wrote a couple of other rtx cost patches. == Next week == * Backport fix for #823711 to upstream branches. * Hopefully finish off rtx costs stuff. * Unless there's a clear outcome from the gcc@ discussion, I think I'll abandon my idea of using insn_rtx_cost in the new auto inc/dec patch, and simply sum the cost of every SET. Should be a small change. Richard

15 years, 1 month

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[ACTIVITY] 15th - 19th August

by Asa Sandahl

* Started running EEMBC on Panda. Got three errors in the automotive test at this point. * Started documenting necessary steps for my start-up task: https://wiki.linaro.org/Internal/ToolChain/Benchmarks/First%20time%20notes * Upgraded the Snowball board to the latest version (V3). Created a corresponding test image for Snowball (Linaro 11.06). There is a problem with the serial console freezing after a couple of minutes without any error, not sure if it is a complete crash or just the serial output. The people I have talked to so far has not experienced the same problem. I will set up the networking for the board and see where ssh gets me. Best Regards Åsa

15 years, 1 month

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[ACTIVITY] August 14-18

by Ira Rosen

Hi, - change of default vector size for auto-vectorization on NEON - submitted and approved - continued working on vectorization of widening shifts - looked into SLP vectorization for libav - two vacation days I'll be on vacation on Aug 22-30. Ira

15 years, 1 month

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Basic libav profiling

by Michael Hope

I put a build harness around libav and gathered some profiling data. See: bzr branch lp:~linaro-toolchain-dev/+junk/libav-suite It includes a Makefile that builds a C only, h.264 only decoder and two Creative Commons licensed videos to use as input. README.rst has the basic commands for running ffmpeg and initial perf results showing the hot functions. Dave, 20 % of the time is spent in memcpy() so you might want to have a look. The vectoriser has no effect. GCC 4.5 is ~17 % faster than 4.6. I'll look into extracting and harnessing the functions themselves later this week. -- Michael

15 years, 1 month

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Is the Linaro toolchain useful on x86/x86_64?

by Bernhard Rosenkranzer

Hi, is the Linaro toolchain (esp. gcc) useful on x86/x86_64, or is an attempt to use the Linaro toolchain with such a target just asking for trouble? (No, I'm not secretly an Intel spy ;) Just trying to have some fun with my desktop machine ;) ) ttyl bero

15 years, 1 month

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Linaro GDB 7.3 2011.08 released

by Ulrich Weigand

The Linaro Toolchain Working Group is pleased to announce the release of Linaro GDB 7.3. Linaro GDB 7.3 2011.08 is the first release in the 7.3 series. Based off the latest GDB 7.3, it includes a number of ARM-focused bug fixes. This release includes all bug fixes from the latest Linaro GDB 7.2 release that were not already included in FSF GDB 7.3. In addition, this release fixes: * LP: #804401 [remote testsuite] Thread support * LP: #804387 [remote testsuite] Shared library test problems * LP: #804392 [remote testsuite] Rebuilt executables not copied * LP: #804396 [remote testsuite] Spurious failures The source tarball is available at: https://launchpad.net/gdb-linaro/+milestone/7.3-2011.08 More information on Linaro GDB is available at: https://launchpad.net/gdb-linaro

15 years, 1 month

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Linaro QEMU 2011.08 released

by Peter Maydell

The Linaro Toolchain Working Group is pleased to announce the release of Linaro QEMU 2011.08. Linaro QEMU 2011.08 is the latest monthly release of qemu-linaro. Based off upstream (trunk) QEMU, it includes a number of ARM-focused bug fixes and enhancements. This month's release is primarily minor improvements: - Fixes LP:816791: ARMv6 cp15 barrier instructions now work in linux-user mode as well as system mode - Support for ARM1176JZF-S core has been added (thanks to Jamie Iles <jamie(a)jamieiles.com>) - Add workaround for kernel bug LP:727781 (which has resurfaced in 3.0) to suppress warnings about bad-width omap i2c accesses Plus of course new upstream fixes and improvements. Performance: When running qemu in system mode with an SD card image we have determined that performance is best when the image is in writeback caching mode. This significantly increases the performance of the SD card (by factors of 10 or more). An example command line option is: -drive if=sd,cache=writeback,file=my-sd-card.img Note that cache=writeback may result in data not being written to disk if the host system powers down unexpectedly (guest crashes or powerdowns are not a problem). Known issues: - The beagle and beaglexm models still do not support USB networking - There may be some problems with running multithreaded programs in linux-user mode (LP:823902) The source tarball is available at: https://launchpad.net/qemu-linaro/+milestone/2011.08 Binary builds of this qemu-linaro release are being prepared and will be available shortly for users of Ubuntu. Packages will be in the linaro-maintainers tools ppa: https://launchpad.net/~linaro-maintainers/+archive/tools/ More information on Linaro QEMU is available at: https://launchpad.net/qemu-linaro

15 years, 1 month

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Linaro GCC 4.6 and 4.5 2011.08 released

by Michael Hope

The Linaro Toolchain Working Group is pleased to announce the 2011.08 release of both Linaro GCC 4.6 and Linaro GCC 4.5. Linaro GCC 4.6 2011.08 is the sixth release in the 4.6 series. Based off the latest GCC 4.6.1+svn177703, it focuses on fixing bugs found during the Android integration and in SMS. This is a quiet release due to Linaro Connect. Interesting changes include: * Updates to 4.6.1+r177703 Fixes: * LP: #736007 ICE immed_double_const at emit-rtl.c * LP: #809768 ICE when compiling bionic's libm * LP: #815777 Inconsistent packaging between tarball and root directory names Linaro GCC 4.5 2011.08 is the thirteenth release in the 4.5 series. Based off the latest GCC 4.5.3+svn177552, the release is focused on maintenance. Interesting changes in 4.5 include: * Updates to 4.5.3+r177552 * Now builds for PowerPC Fixes: * LP: #736007 ICE immed_double_const at emit-rtl.c * LP: #809768 ICE when compiling bionic's libm * LP: #815435 ICE: insn does not satisfy its constraints The source tarballs are available from: https://launchpad.net/gcc-linaro/+milestone/4.6-2011.08 https://launchpad.net/gcc-linaro/+milestone/4.5-2011.08 Downloads are available from the Linaro GCC page on Launchpad: https://launchpad.net/gcc-linaro Mailing list: http://lists.linaro.org/mailman/listinfo/linaro-toolchain Bugs: https://bugs.launchpad.net/gcc-linaro/ Questions? https://ask.linaro.org/ Interested in commercial support? inquire at support(a)linaro.org -- Michael

15 years, 1 month

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Improving libgmp [was: Re: Potential tools team work]

by Michael Hope

On Thu, Aug 18, 2011 at 4:16 AM, Richard Earnshaw <Richard.Earnshaw(a)arm.com> wrote: > I was just browsing libgmp this afternoon and noticed that it really > could do with an overhaul to support recent ARM chips. > > The ARM code seems to have been written for StrongARM; which is now > almost obsolete (for example, it loads from a cache line it is about to > write to in order to pre-allocate the line in the cache). > > It doesn't support v4T interworking. > > It doesn't make any use of v5 or later instructions. > > There is some Thumb(1) code, but again it has no support for > interworking, is pretty poor and limited in scope. > > I'm not sure overall how useful this is to gcc performance; the library > is needed to build GCC, but I think it's mostly there to support libmpfr. > > Nevertheless, there are other apps out there that make use of this > stuff, including some crypto code, IIRC. I looked at using gmp as a benchmark some time ago. The assembly version is twice as fast as the C version already, which is nice. I assume NEON would be a big improvement as well. I had a quick poke through the dependencies in Ubuntu and came up with the following popular packages that use libgmp or libmpfr: * guile * python-crypto * gch (Haskel) * maxima * darcs Nothing earth shattering but probably worthwhile. I've registered: https://blueprints.launchpad.net/linaro-toolchain-misc/+spec/improve-libgmp so that we don't lose it. -- Michael

15 years, 1 month

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Branch is open

by Michael Hope

Hi there. The 2011.08 release has been spun and is testing up well. The 4.5 and 4.6 branches are now open so feel free to commit any approved patches. -- Michael

15 years, 1 month

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Re: What are the chances of a phone based developer image

by Ramana Radhakrishnan

> . Would you be interested in adding a Firefox-based benchmark? As a large > application it is a good testbed for LTO, FDO and other aggressive > optimizations. Sorry about the delayed response. I did notice your mail last week but I was busy with our conference and then the first couple of days this week have just disappeared with some internal training. I would be interested in hearing how you get on with LTO and FDO on ARM. Listening to Honza talking at the GCC unconference in London about the memory usage for full LTO with trunk I did wonder what would happen if we tried it on the ARM target to see what we got, but I never managed to get around to trying anything there :) . We did look at getting FDO working with Linaro GCC last cycle but there are still a couple of issues with PGO in Linaro GCC 4.5. With respect to LTO , the one problem we have currently is that the Neon intrinsics aren't streamed out and streamed back in. So you might have a few issues if your code uses arm_neon.h . https://bugs.launchpad.net/gcc-linaro/+bug/823548 is an example of this problem. This was fixed upstream and we probably just need to backport that into our 4.6 tree. I've tried a backport this morning and I think I have this right finally. If you could do a build and a firefox benchmark run in about 30-60 minutes by all means please do let us know how you get on and what you find. We've been steadily trying to improve the performance of the ARM toolchain and the biggest improvements you'll notice will be with the vectorizer but there will be other small improvements that you'll notice in other general areas of code generation. We would be interested in feedback about what can be done and to add to our queue of things to look at and improve for the ARM port of GCC. With respect to the images, Kiko's probably answered that bit. cheers Ramana

15 years, 1 month

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[ACTIVITY] 8th - 12th August.

by Andrew Stubbs

* GCC Continued tracking down problems in my various broken patches. Fixed one bug, investigated two more. Re-submitted the widening multiplies for testing, and this time it returned with no problems. Yay, I can now check it in next week. Merged from upstream GCC 4.5. The launchpad import bug still exists (although should not for much longer) so I had to ask on #launchpad to get the imports done. Submitted the merged branch for testing. Tried to merge GCC 4.6 similarly, but failed. Bzr just refused to play ball, which was very frustrating. Michael Hope has now done the merge instead. * Other On leave Wednesday and Friday.

15 years, 1 month

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[ACTIVITY] weekly status

by Revital Eres

* libauqntum - running the SMSed version on ARM machine did not show significant improvement. Discussed it with Richard Sandiford. Apparently in the SMS phase the instructions are of DI mode due to the fact the loop contains 64 bit operations while they later been generated as 32 bit operations. This makes SMS less accurate and I'm now looking into a version which disables DI mode operations. * Started to look at the potential of SMS on libav. Initial runs of Richard's microbenchmarks with SMS show some regressions as well as improvements that I'm looking at.

15 years, 1 month

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Standard GCC configurations

by Michael Hope

Hi there. I've written up the standard configurations that we use to build and test Linaro GCC: https://wiki.linaro.org/WorkingGroups/ToolChain/Configurations/GCC It includes such things as flags, libraries, and sysroots. You might find it useful to see what we're testing or, if new to compilers, what a good starting point is. -- Michael

15 years, 1 month

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[ACTIVITY] 2011-08-12

by David Gilbert

== QEMU == * Finished off a first cut of the 64bit helper patch to QEMU - Gave it to Peter and have reworked most of the things he commented on * This also lead into a bit of a rabbit hole of finding various generic QEMU threading issues * Tested Peter's 11.08 QEMU release (I used linaro-fetch-image-ui for the first time to grab the release images; quite nice, hit a couple of issues but much nicer than crawling around the site to find where the hwpacks are). == Other == * Pinged gcc patches list for more comments on 64bit atomic patch I'm on holiday the week of 22nd (i.e. the week after next). Dave

15 years, 1 month

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[ACTIVITY] Aug 8 - Aug 12

by Ulrich Weigand

== GDB == * Re-tested Linaro GDB 7.3 on Versatile Express (native & remote testing). * Committed patch to re-enable remote thread test cases (#804401) to mainline and Linaro GDB 7.3. * Reviewed Yao's latest Thumb-2 displaced stepping patch. == GCC == * Patch review week. Mit freundlichen Gruessen / Best Regards Ulrich Weigand -- Dr. Ulrich Weigand | Phone: +49-7031/16-3727 STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E. IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Martin Jetter | Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht Stuttgart, HRB 243294

15 years, 1 month

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[ACTIVITY] report week 32

by Peter Maydell

RAG: Red: Amber: OMAP3 patch upstreaming is slower progress than hoped Green: Current Milestones: || || Planned || Estimate || Actual || ||qemu-linaro 2011-08 || 2011-08-18 || 2011-08-18 || || Historical Milestones: ||qemu-linaro 2011-04 || 2011-04-21 || 2011-04-21 || 2011-04-21 || ||qemu-linaro 2011-05 || 2011-05-19 || 2011-05-19 || n/a || ||close out 1105 blueprints || 2011-05-28 || 2011-05-28 || 2011-05-19 || ||complete 1111 planning || 2011-05-28 || 2011-05-28 || 2011-05-27 || ||qemu-linaro-2011-06 || 2011-06-16 || 2011-06-16 || 2011-06-16 || ||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || 2011-07-21 || == linaro-qemu-11.11 == * put together release candidate tarball for 2011.08 release, tested * added a workaround for omap kernel bug LP:727781 which had been fixed in 2.6.x but has resurfaced in 3.0 * tarball now ready and only needs releasing next week == 64-bit-sync-primitives == * reviewed David Gilbert's qemu patches to support 64 bit sync primitives == upstream-omap3-patches == * testing/reading Avi's memory API patches to see how they fit in or clash with the qdevification and other omap3 patches == other == * more investigation/thought about LP:823902 -- qemu bug running multithreaded programs in linux-user mode * Manned Linaro demo stand at ARM Partner Meeting (Tue, Wed) * Meetings: GSoC student x2, toolchain, toolchain standup, 1-2-1 Current qemu patch status is tracked here: https://wiki.linaro.org/PeterMaydell/QemuPatchStatus Absences: 15-19 August: KVM Forum and LinuxCon NA, Vancouver

15 years, 1 month

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[Activity] Week ending 2011-08-12

by Ramana Radhakrishnan

== GCC == === Progress === * Linaro sprint last week - one day of fun with broken laptop. * Looked at how we could get BUILTIN_VECTORIZE_CONVERT work to allow vectorizing some of the floating point conversions. * Fixed PR50022 . Couple of iterations. * Internal training for 2 days. * Dusted off a couple of my old patches and sent them out after testing. * Next to get back to old VFP and ivopts patch. * Looked at a testfailure with -mvectorize-with-neon-quads with Ira . === Plans === * Continue to look at the test failure with mvectorize-with-neon-quad * Finish off optimize_size patch based on comments. * finish off case for handling tbh instrucitons. * Commit fix for PR50022 * Look at some of the issues with VFP moves and try and get forward with it. * Look at BRANCH_COST results. Meetings: * 1-1s * TCWG calls * GNU Toolchain planning meeting. * Some patch review and bugzilla triaging. Absences. * 1st Aug - 5th August - Linaro sprint. * 8th - 9th August - Internal training. * 29th Aug - Sept. 2 - Holiday booked and approved. * 31st Oct - 4th Nov - Linaro Summit Orlando - Travel to be booked.

15 years, 1 month

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[ACTIVITY] Weekly status

by Richard Sandiford

== This week == * Looked a bug report that the fix for LP #736007 had caused regressions on powerpc-darwin. It turned out to be a target-specific bug; the backend has the same const_vector code as i386 and spu, but the fix for PR34856 was never applied there. I'll submit the patch (and backport to Linaro 4.6) once the bug submitter has had a chance to test it. * Experimented with -falign-loops. Found that it triggered a bug in the ARM minipool layout code. Posted patch upstream and committed. Backported to 4.6. * Committed patch to allow globs in define_bypass. * Updated auto inc/dec patch after comments from Bernd and Stephen. I'm pretty happy with it now, but there are a couple of prerequisite patches I need to sort out first. * Started getting those prerequisites ready. * Decided that we needed something a bit more subtle than my original insn_rtx_cost patch: at the moment, we simply don't use rtx costs for lvalues. Wrote a series of patches to "improve" the rtx_cost interface, including providing the outer operand number and an indication of whether the rtx is an lvalue or an rvalue. * Upgraded my laptop. This turnted out to be more eventful than anticipated, and ended up taking a whole day. == Next week == * Post auto inc/dec preparatory patches for review. Hopefully post an RFA for the pass itself. Richard

15 years, 1 month

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[ACTIVITY] weekly status

by Ken Werner

Hi, * worked on getting the remote unwind support for ARM upstream * noticed when building a recent android image of the linaro_android_2.3.4 branch for the panda the init.rc attempts to mount wrong partitions * tracked down the commit and opened a bug * linaro android team fixed it real quick * started to integrate libunwind into Andriod * two issues here: - the build system requires an Android.mk (while libunwind is autoconf+libtool based) - libunwind uses some interfaces/headers that are not provided by the bionlic libc Regards Ken

15 years, 1 month

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Re: What are the chances of a phone based developer image

by Christian Robottom Reis

On Thu, Aug 04, 2011 at 12:03:00PM -0700, Taras Glek wrote: > Recently we have been looking at how to squeeze more performance out > of our toolchain for building Firefox on Android. Mike Hommey > integrated GCC 4.6 into the android NDK and has been testing > performance (with mixed results > http://gcc.gnu.org/ml/gcc/2011-08/msg00096.html). You should definitely be trying to build using the Linaro 4.5 and 4.6 compiler branches; they are pretty much guaranteed to give you better performance, and if they don't, we're on the hook to fix it quickly! All the patches go upstream, so there is no risk of you being stuck on a fork -- it just makes everything you need available right now. I'm copying the linaro-toolchain list to make sure that you get the right people's attention (though if they weren't all coming back from Connect in Cambridge this week they would have picked the email up already). > I like how Linaro is doing regular arm benchmarking, ie > https://wiki.linaro.org/Platform/Android/AndroidToolchainBenchmarking/2011-… We do much more than that, but it's not as easy to find right now; for instance http://ex.seabright.co.nz/helpers/benchcompare is Michael's regular release benchmark. > . Would you be interested in adding a Firefox-based benchmark? As a > large application it is a good testbed for LTO, FDO and other > aggressive optimizations. Totally. Let's do it. Can you give me an idea of what boards you are testing the build on today? Do you have a test suite that we could run in a reasonable timeframe (hours, not days)? > We are also looking at setting a developer-friendly android ROM with > oprofile, perf, systemtap, gdb, debug symbols, etc. It might even be > beneficial for us to use newer kernels as we exlore options like > kernel-assisted ld.so relocations, etc. That seems to similar to > what Linaro provides in the evaluation ROMS. Is there any chance of > Linaro providing developer-friendly "evaluation" ROMs for retail > phones like the Nexus S? It's indeed pretty similar (we just call them LEBs), and Zach will be really interested in working with you on this. As for supporting actual released phones, it lies somewhat outside of our optimal operating model, and we don't have any hardware available. I guess we could do a spin for a specific model if we had enough of them to use by a set of engineers in the different teams. They are so expensive, though. Do you guys have lots of them? -- Christian Robottom Reis, Engineering VP Brazil (GMT-3) | [+55] 16 9112 6430 | [+1] 612 216 4935 Linaro.org: Open Source Software for ARM SoCs

15 years, 1 month

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Change in Linaro Toolchain naming

by Michael Hope

Hi there. This is a heads-up that the name of the Toolchain group releases will change slightly with next weeks release. We're dropping the respin suffix (the -0) to line up with the new whole of Linaro naming convention. What was: gcc-linaro-4.6-2011.xx-0.tar.bz2 gdb-linaro-7.2-2011.xx-0.tar.bz2 qemu-linaro-0.15-2011.xx-0.tar.bz2 will now be: gcc-linaro-4.6-2011.xx.tar.bz2 gdb-linaro-7.2-2011.xx.tar.bz2 qemu-linaro-0.15-2011.xx.tar.bz2 Earth shattering, eh? I've taken the opportunity to write up our naming convention at the same time: https://wiki.linaro.org/WorkingGroups/ToolChain/Naming -- Michael

15 years, 1 month

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Re: RFC: Saving and restoring the assembler state during assembly

by Richard Sandiford

Dave Martin <dave.martin(a)linaro.org> writes: > However, there's not really anything fundamentally > architecture-specific about this problem, and ideally the solution and > the directives should not be architecture-specific either. > One option which appeals to me is to have some directives which can > exist across all architectures, and do something analogous to what > .set push and ,set pop do on MIPS. FWIW, this sounds like a really good idea to me. I won't argue about the syntax (I have no particular preference). > I feel that the environment should also include global, > target-independent state such as the current macro mode (.altmacro > versus .noaltmacro) and current ELF section stack state, but not > symbols or macro definitions themselves. Sounds reasonable. To state the obvious, we'd have to make the existing target-dependent groupings (like .set push/pop on MIPS) work with this new scheme, but those directives musn't affect this extra target-independent information. So the new directives would interact with both the traditional .pushsection and the traditional target-dependent directives, even though those two features would otherwise remain independent. That is, .pushsection and .set push/pop operate on conceptually separate stacks whoses pushes and pops can be freely mixed. But .pushsection and the new directives would need to be strictly stacked; pops must have the same form as their corresponding pushes. Combinations of .set push/pop and the new directives would also need to be strictly stacked. Nothing a bit of code can't handle though. Richard

15 years, 1 month

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RFC: Saving and restoring the assembler state during assembly

by Dave Martin

Hi all, On ARM, we've now hit the problem a few times of temporarily overriding the assembler state (or rather, not being able to do this reliably). For example, sometimes there's a need to assemble a few instructions for a different architecture version so we can optionally execute or skip them at run-time is not really possible at present. This sort of feature is especially useful in macros but can be useful elsewhere too. There seem to be some target-specific solutions to this problem already. MIPS has its "option stack", maintained by .set push and .set pop directives. From the documentation, it sounds like this saves/restores a somewhat comprehensive set of state, but doesn't make much syntactic sense on arches which use .set to define symbols (i.e., most arches). PowerPC also has .machine push and .machine pop, but those only act on one specific aspect of the assembler state, and therefore aren't as portable a concept. However, there's not really anything fundamentally architecture-specific about this problem, and ideally the solution and the directives should not be architecture-specific either. One option which appeals to me is to have some directives which can exist across all architectures, and do something analogous to what .set push and ,set pop do on MIPS. My names would be .pushenv and .popenv, but obviously, they can be named any way people like. (For now I'm stealing groff's "environment" terminology to refer to such saved and restored state -- hence "env". Again, the nomenclature is arbitrary.) These directives would save and restore a target-specific set of state, which the philosophy that anything that can reasonably be changed with a directive mid-file can also be saved and restored with .pushenv/.popenv. Effectively, .popenv would be equivalent to issuing the necessary set of assembler directives to restore the assembler state to whatever it was at the last .pushenv (including the state of the environment stack itself) I feel that the environment should also include global, target-independent state such as the current macro mode (.altmacro versus .noaltmacro) and current ELF section stack state, but not symbols or macro definitions themselves. Currently, neither the macro mode nor the behaviour of .previous is reliably restorable after being changed (unless I missed something). This can result in unexpected behaviour after a macro which switches sections or changes the macro mode. This seems unfortunate since on most arches there is no syntactic difference between a machine instruction and a macro invocation -- hence in the presence of macros, the only time you're really 100% certain what .previous will do is immediately after a .pushsection or .section directive (which obviously is not much use). Comments are welcome -- at the moment this is just a fuzzy idea for a feature which might prove useful. I haven't investigated the implementation implications -- maybe it could be built straightforwardly around the current MIPS directives. Cheers ---Dave

15 years, 1 month

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[ACTIVITY] August 7-11

by Ira Rosen

Hi, * fixed PR 50014 and 50039 - to be backported to linaro-gcc * tested the patch to change the default vector size on NEON * found one test that fails with quad-words - gcc.c-torture/execute/mode-dependent-address.c. Debugging it with Ramana. * started looking into widening shifts Vacation plans: next week Monday and Wednesday and August 22 - 30. Ira

15 years, 1 month

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ld in current (4.6-2011.07-0-8-2011-07-25_12-42-06) toolchain fails to link uboot

by Bernhard Rosenkranzer

Hi, ld in the current (4.6-2011.07-0-8-2011-07-25_12-42-06) Android toolchain fails to link uboot: arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/libgeneric.o: Unknown mandatory EABI object attribute 44 arm-eabi-ld: failed to merge target specific data of file /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/crc16.o arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/libgeneric.o: Unknown mandatory EABI object attribute 44 arm-eabi-ld: failed to merge target specific data of file /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/crc32.o arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/ctype.o: Unknown mandatory EABI object attribute 44 arm-eabi-ld: failed to merge target specific data of file /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/ctype.o arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/div64.o: Unknown mandatory EABI object attribute 44 arm-eabi-ld: failed to merge target specific data of file /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/div64.o arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/errno.o: Unknown mandatory EABI object attribute 44 arm-eabi-ld: failed to merge target specific data of file /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/errno.o arm-eabi-ld: /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/ldiv.o: Unknown mandatory EABI object attribute 44 arm-eabi-ld: failed to merge target specific data of file /mnt/user/bero/android-iMX53-20110716151649/out/target/product/iMX53/obj/u-boot/lib/ldiv.o I believe this is already fixed in upstream binutils (or at least in hjl's 2.21.52.0.2 release from kernel.org /pub/linux/devel/binutils). ttyl bero

15 years, 1 month

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tomorrow's call cancelled.

by Ramana Radhakrishnan

Given I'm away at some internal training and we had one last week . I decided to cancel this. Ramana

15 years, 1 month

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[ACTIVITY] report week 31

by Peter Maydell

RAG: Red: Amber: OMAP3 patch upstreaming is slower progress than hoped Green: Current Milestones: || || Planned || Estimate || Actual || ||qemu-linaro 2011-08 || 2011-08-18 || 2011-08-18 || || Historical Milestones: ||qemu-linaro 2011-04 || 2011-04-21 || 2011-04-21 || 2011-04-21 || ||qemu-linaro 2011-05 || 2011-05-19 || 2011-05-19 || n/a || ||close out 1105 blueprints || 2011-05-28 || 2011-05-28 || 2011-05-19 || ||complete 1111 planning || 2011-05-28 || 2011-05-28 || 2011-05-27 || ||qemu-linaro-2011-06 || 2011-06-16 || 2011-06-16 || 2011-06-16 || ||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || 2011-07-21 || == upstream-omap3-patches == * discussion with upstream about how best to model omap-gpmc as qdev == other == * Attended Linaro Connect Q3.11 * submitted some patches which fix minor bugs that were preventing the QEMU M3 model from booting the Keil example binary images * miscellaneous upstream patch review Current qemu patch status is tracked here: https://wiki.linaro.org/PeterMaydell/QemuPatchStatus Absences: 9, 10 August: manning Linaro demo stand at APM 15-19 August: KVM Forum and LinuxCon NA, Vancouver

15 years, 1 month

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[ACTIVITY] Weekly status

by Richard Sandiford

== Last week (Linaro Connect) == * Reran libav comparisons after Ira's fix for excessive promotion. The vectorized versions are now at least as good as the non-vectorised ones. Updated wiki page with new asm output and microbenchmark results. * More work on SMS. I have some patches that wire up the ddg code to IV analysis. It gave some nice benchmark improvements, but also some regressions. Traced the regressions down to cases where the schedule for small iis generated too many moves. E.g. in a small microbenchmark, we were able to schedule 6 instructions with an ii of 3 (i.e. in a loop iteration of 3 cycles), but then needed to add ~9 moves in order to keep the dependencies correct. We got much better code with a larger ii and fewer moves. Wrote a patch to estimate how many moves would be added, and to try to a larger ii if the number of moves is too high. This improved the results for one benchmark independently of the iv patch, and had no effect on the others. Discussed this with Revital, who said that Mustafa had tried a similar thing but seen no benefit. * Got powerpc-ibm-aix5.3 bootstraps working. Needs a few local fixes due to C++ bootstrapping. Used it to test a couple of preparatory patches for the IV work. Submitted those patches upstream. * Ran benchmarks with -fno-schedule-insns after seeing that the first scheduling pass was responsible for the main NEON-vs.-non-NEON regression in EEMBC. It fixed that case, but as expected, made others worse. Mentioned this to Ramana, who pointed me at -fsched-pressure. Reran the benchmarks with -fsched-pressure instead of -fno-schedule-insns. It too fixed the main regression, and improved a couple of other tests too. It showed a regression in another test though. Looked at that regression. It was a case where many registers were live across a loop, but not used in it. This was causing the loop to have a very conservative schedule. It would be better to spill some of the other registers instead. Wrote a patch to take loops into account, and it seemed to do the right thing for EEMBC. Sent it to Andreas, after Ulrich mentioned that he had been looking at -fsched-pressure problems on s390. Andreas is away for a while, though, so I might put this on the back burner until he gets back. == This week == * SMS * auto inc/dec * libav, perhaps Richard

15 years, 1 month

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[ACTIVITY] Aug 1-5

by Ira Rosen

Hi, * committed upstream a patch that reduces over-promotion of vector operations * started to work on a new version of the patch to change the default vector size for Neon * attended Linaro connect Ira

15 years, 1 month

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[ACTIVITY] Weekly status

by Revital Eres

* Committed a set of SMS patches to trunk and gcc-linaro branch. * Implemented a hack to evaluate the potential of SMS on SPEC2006/libqauntum. * involved in non linaro issue

15 years, 1 month

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[ACTIVITY] 2011-08-05

by David Gilbert

== QEMU == * After discussion with Peter started writing QEMU fixup for 64bit atomic helper version location. * Sent fixes for soc-dma code to qemu list * Trying to understand just how much of omap_dma's code is needed. == Other == * Travelling to/from connect * Wanted to dial into some of the seessions in Corpus and Magdelen rooms but the remote audio from them was unusable. Dave

15 years, 1 month

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[ACTIVITY] weekly status

by Ken Werner

Hi, Libunwind: * finished initial ARM support for remote unwinding (libunwind-ptrace) Android: * took a closer look at the debuggerd * got the perflab benchmark running on my PandaBoard using Linaro GCC Misc: * remotely attended some Linaro Connect Android sessions Regards Ken

15 years, 1 month

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[ACTIVITY] Aug 1 - Aug 5

by Ulrich Weigand

== GDB == * Created Linaro GDB 7.3 branch * Ported all remaining feature patches from Linaro GDB 7.2 * Backported mainline patches to fix remote test issues: - Fixed #804387 Shared library test problems - Fixed #804392 Rebuilt executables not copied - Fixed #804396 Spurious failures * Committed mainline patch to fix dlopen test cases for remote testing (#804387). * Committed mainline patches to fix misc. other remote test problems (#804396). == Misc == * Attended Linaro Connect in Cambourne. Mit freundlichen Gruessen / Best Regards Ulrich Weigand -- Dr. Ulrich Weigand | Phone: +49-7031/16-3727 STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E. IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Martin Jetter | Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht Stuttgart, HRB 243294

15 years, 1 month

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libav wiki page updated for current FSF trunk

by Richard Sandiford

I've updated: https://wiki.linaro.org/RichardSandiford/Sandbox/NeonLibAv so that it gives the output for current trunk, including Ira's commit yesterday to reduce the amount of overpromotion. I also reran the microbenchmarks. The good news is that the vectorised code is now better in all cases than the non-vectorised code. The biggest winner from last time was rgb24tobgr16_C(). It used to be much worse with vectorisation due to lots of excessive widening. Thanks to Ira's patch, the loop now looks pretty respectable, and is ~3.25x faster than the non-vectorised code. As well as using a more recent compiler, the new version also uses -mvectorize-with-neon-quad. Once again it shows a significant improvement over the default. Richard

15 years, 1 month

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QEMU futures

by Michael Hope

Hi there. We had a brainstorm this afternoon about areas QEMU could go into in the future. My pigeon-scratchings are at: https://wiki.linaro.org/WorkingGroups/ToolChain/Q3.11/QEMUFutures See also: https://wiki.linaro.org/MichaelHope/Sandbox/RoadmapIdeas#QEMU_everywhere -- Michael

15 years, 1 month

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[ACTIVITY] 25th - 31st July

by Andrew Stubbs

Continued work on widening multiplied. I've identified another cause for the bootstrap failure, and submitted the new version for testing. Continued trying to find out how my thumb2 constants patches are broken. This is taking ages due to the time it takes to turn around a bootstrap build on my IGEP board. Tried to get the CS Panda boards to work again. They'll do the bootstrap builds much faster (if still not quickly), but are no longer very well. All my attempts to bring them back up remotely have failed. I've discovered that the device the serial console on one was connected to has been relocated to the new Mentor Graphics board lab, so this might explain some of it .... Chaired the Monday and Thursday meetings in Michael's absence. Travelled to the Linaro Connect event in Cambourne, near Cambridge. Other: More machine trouble. I keep thinking I have the display issues solved, and then it starts up with all the windows displayed double sized, but requiring mouse clicks in the correct location .... typically this happened just when I needed access to the pin number for the Monday meeting. This hasn't happened since Monday, so hopefully it's now ironed out ... this sort of thing does not happen with Windows. :( ---- Upstream patched requiring review: * NEON scheduling patch http://gcc.gnu.org/ml/gcc-patches/2011-02/msg01431.html

15 years, 1 month

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[ACTIVITY] Weekly status

by Revital Eres

* Looking into SMS patches sent to mainline which expands SMS functionally to avoid using doloop. The patches resolve the recent bootstrap failure on mainline. http://gcc.gnu.org/ml/gcc-patches/2011-07/msg01807.html * Continue looking into 462.libquantum.

15 years, 2 months

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Using valgrind with linaro toolchain

by Diane Holt

Valgrind wants a less stripped ld-2.12.1.so or it won't work. The build process (that Michael Hope put together) just downloads the libc6_2.12.1-0ubuntu6_armel.deb, and the ld-2.12.1.so in there is fully stripped. I thought I'd be able to just get the libc6-dbg_2.12.1-0ubuntu6_armel.deb instead, thinking that was just the pre-stripped version of these libs -- but apparently it's not, because trying to use those libs instead of the stripped ones results in undefined symbols. For example, ld-2.12.1.so defines _rtld_global -- but libc-2.12.1.so is looking for _rtld_global@@GLIBC_PRIVATE, so _rtld_global@@GLIBC_PRIVATE ends up undefined. (Ditto for __tls_get_addr, __libc_enable_secure, _dl_argv, etc.) I'm not sure who actually builds these packages (they're retrieved from: http://ports.ubuntu.com/pool/main/e/eglibc/), but if anyone has any suggestions on how to get past this, I'd be most appreciative. (I've got angry developers trying to track down memory issues, who about to come after me with torches and pitchforks :P ) Thanks, Diane

15 years, 2 months

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[ACTIVITY] Jul 25 - Jul 29

by Ulrich Weigand

== GDB == * Committed second mainline patch to fix re-built executable remote test problems (#804392). * Prepared for rebasing Linaro GDB on top of GDB 7.3 release. == Misc == * Prepared for Linaro Connect. Mit freundlichen Gruessen / Best Regards Ulrich Weigand -- Dr. Ulrich Weigand | Phone: +49-7031/16-3727 STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E. IBM Deutschland Research & Development GmbH Vorsitzender des Aufsichtsrats: Martin Jetter | Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht Stuttgart, HRB 243294

15 years, 2 months

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[ACTIVITY] weekly status

by Ken Werner

Hi, * Monday was full of IBM internal meetings * Android * got a self built LEB and generic version 2.3.4 of linaro android running on my pandaboard (build with the gcc 4.6 07 release plus the patch that Richard made) * requires libicui18n.so (external/icu4c/i18n) to be built with -O2 * ran into a few issues (816491, 807230) * libunwind: * simplified the local unwinding (there is no need to touch the ARM exidx table segment when looking it up) * fixed a bug (corner case: the info of the IP to be unwound is described by the last unw entry) * made some progress on the remote unwinding via ptrace * remotely searching the unw withing entry exidx table segment * next step is to remotely extract the unw isns Regards Ken

15 years, 2 months

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[ACTIVITY] report week 30

by Peter Maydell

RAG: Red: Amber: OMAP3 patch upstreaming is slower progress than hoped Green: various outstanding patches accepted upstream in time for 0.15 Current Milestones: || || Planned || Estimate || Actual || ||qemu-linaro 2011-08 || 2011-08-18 || 2011-08-18 || || Historical Milestones: ||qemu-linaro 2011-04 || 2011-04-21 || 2011-04-21 || 2011-04-21 || ||qemu-linaro 2011-05 || 2011-05-19 || 2011-05-19 || n/a || ||close out 1105 blueprints || 2011-05-28 || 2011-05-28 || 2011-05-19 || ||complete 1111 planning || 2011-05-28 || 2011-05-28 || 2011-05-27 || ||qemu-linaro-2011-06 || 2011-06-16 || 2011-06-16 || 2011-06-16 || ||qemu-linaro-2011-07 || 2011-07-21 || 2011-07-21 || 2011-07-21 || == upstream-omap3-patches == * omap-gpmc patches now all cleaned up; I think I need to look at qdevifying this device before submitting patches, though * sent patch for bug which makes n810 model crash when key is pressed * sent a pull request collecting together the patches submitted so far == other == * qemu 0.15: put together pull request for ARM patches I think should go into this release; wrote ARM-related bits of the release notes * helped GSoC student track down a bug causing android not to boot * LP:816791: tracking down issues with running mono under qemu (combination of a couple of known qemu bugs and a mono bug) * admin/prep for upcoming travel (cambourne, vancouver, orlando) * reviewing pl041 patches which add audio support to versatilepb and vexpress models * mailing list discussion of possible new qemu object model * lots of meetings this week (toolchain, standup, doughnuts, team comms x2) Current qemu patch status is tracked here: https://wiki.linaro.org/PeterMaydell/QemuPatchStatus Absences: 1-5 August: Linaro sprint 1111 15-19 August: KVM Forum and LinuxCon NA, Vancouver

15 years, 2 months

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multilib'd (softfp/hardfp) gcc available in Ubuntu oneiric

by Matthias Klose

the current gcc-4.6/eglibc is now built multilib'd for -mfloat-abi=softfp|hard, including the GCC runtime libraries. I hope that the gcc cross builds will pick this up soonish, not needing to build the cross compiler twice for softfp and hard float-abi. Matthias

15 years, 2 months

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[ACTIVITY] 2011-07-29

by David Gilbert

== 64 bit atomics == * Sent updated set of 64bit atomic patches to gcc list with fixes from previous review * Started hunting for other users of 64bit atomics than membase jemalloc, sdl and boost lock free look like possibilities; but I've not looked at them hard yet == QEmu == * Released fix for last SD card block access error - Vincent Palatin released a bunch of SD card fixes a few hours later - that included a fix to the same bug; however it does look like he has a bunch of other stuff we should keep sync'd with. * Changing caching mode to writeback on the block layer fixes bug 732223 (hangs on heavy IO) - goes from 130KB/s to 8MB/s on vexpress - Asked mailing list whether that's reasonable to make as default for SD * Looking at path from CPU->MMC/SD card - the DMA on OMAP is pretty inefficiently emulated, but the soc_dma code has an unused special case for dma'ing to hardware, looks promising but need to figure out how to use it and if it works. * Comparing Vincent's SD card patch with earlier meego patches; partial overlap. == Other == * Pinged libc-ports for comments on my optimised memchr patch * Image testing Next week; I intend to be in Camborne on the afternoon of Monday, Wednesday and Friday. Dave

15 years, 2 months

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[ACTIVITY] July 24-28

by Ira Rosen

Hi, I am checking the coverage of the NEON instructions mostly by writing tests in C to check which instructions are generated (after auto-vectorization) and which are not. I put here https://wiki.linaro.org/IraRosen/Sandbox/InstructionCoverage the list of things that I've checked till now. Ira

15 years, 2 months

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[ACTIVITY] 18th - 22nd July

by Andrew Stubbs

Spun release tarballs for Linaro GCC 4.5 and 4.6. Sent them to Michael Hope and Matthias Klose. Testing for my widening multiplies patches revealed a bug when the accumulate value had a different type. The problem is easily fixed, so I've created a patch, submitted it, and now it's approved upstream. Same again, this time with a bug involving constant integers. Again, easily fixed, submitted, and approved. Nobody had reviewed the first patch in my series - Richard Guenther had reviewed all the others, but wasn't happy to review the expand pass. So, I asked newly crowned RTL Maintainer Richard Sandiford to review it, but apparently it's the wrong bit of the back-end, so I asked Bernd instead. Bernd kindly reviewed and approved it, so now the whole series is ready to commit if only my test comes back clean. Continued trying to figure out why my thumb2 constants patch is broken. So far, no further progress. It might be that Michael's build system is confused, but it's looking likely to be a real bug. ---- Upstream patched requiring review: * NEON scheduling patch http://gcc.gnu.org/ml/gcc-patches/2011-02/msg01431.html

15 years, 2 months

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[ACTIVITY] Weekly status

by Revital Eres

- Opened PR49789 to record the bootstrap failure with SMS flags. - SPEC2006/libquantum: Wrote a hack to apply SMS on the hot loop. Need to make it more accurate. - Pinged SMS patches in mainline. - Looking with Ramana on the effect of the Tree reassociation improvement patch on bwaves http://gcc.gnu.org/ml/gcc-patches/2011-07/msg00904.html

15 years, 2 months

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[ACTIVITY] 2011-07-22

by David Gilbert

== 64 bit atomics == * Updated gcc patches as per comments from Ramana and Joseph; build currently cooking on Panda == Qemu == * Testing Peter's pre-release, finding bug on beagle (that he tracked down to x-loader change) * Found cause of occasional SD card errors I was seeing (SD: CMD12 in a wrong state); I'll cut a patch next week, but the bug is writing the last sector throws an error and also leaves it in the wrong state * Added a bunch of tracing code to the SD card layer * With the tracing code and fixing the other bug I'm starting to understand how it works - and half a dozen reasons that the emulation is really slow; whether that's the cause of the reported recoverable lock ups under load is an interesting question; I plan to fix the obvious problems and see how it goes. Dave

15 years, 2 months

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