- linaro-toolchain - lists.linaro.org

by Peter Maydell

RAG: Red: Amber: Green: Current Milestones: || || Planned || Estimate || Actual || ||upstream-omap3-cleanup || 2011-11-10 || 2011-11-10 || || Historical Milestones: ||add-omap3-networking || 2011-10-13 || 2011-10-13 || 2011-10-13 || ||a15-systemmode-planning || 2011-10-13 || 2011-10-13 || 2011-09-22 || ||a15-usermode-support || 2011-11-10 || 2011-11-10 || 2011-10-27 || == other == * Linaro Connect week. Included an extremely useful double-length session about KVM on A15, which should turn into blueprints/plans in due course * Found out a bit more about UEFI -- I'm leaning towards having QEMU for vexpress run UEFI by default as a way of letting you just pass it a disk image rather than having to feed it a separatekernel/initrd. (Will look into this more when the ARM landing team have it all building and working on hardware.) * I have a working prototype of the QEMU virtio-mmio transport (written to Pawel's spec). However to get this upstream we will first need to properly refactor the qemu virtio code so the link between the transport and the blk/net/etc backends is a qdev bus. -- PMM

13 years, 8 months

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[ACTIVITY] weekly status

by Revital Eres

Continue working on the regsiter pressure estimation implementation - testing the implementation on libav micro benchmarks. With the patch some SMSed kernels in put-h264-qpel8-hv-lowpass-8, swscale-rgb24ToY_c mjpegenc benchmarks are identified as having register pressure. I'm looking at the kernels which still have regressions with SMS and it seems the reason is not related to register pressure.

13 years, 8 months

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Video - Toolchain support for kernel debugging

by Michael Opdenacker

Hi Ulrich, Here's a video of your session about kernel debugging: http://www.youtube.com/watch?v=_lIz0W3l2E8 Thanks, Michael. -- Michael Opdenacker - Community Manager Linaro, http://linaro.org Phone: +33 484 253 396 IRC: 'opm' in #linaro on irc.freenode.net

13 years, 8 months

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LAVA recipe

by Andrew Stubbs

Hi All, This is a brain dump of what I learned about running LAVA today. Dave will probably find a place for this in the Validation wiki, but I'll pass it round in the meantime. Hope it helps Andrew

13 years, 8 months

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[ACTIVITY] weekly status

by Ken Werner

Hi, * libunwind * posted small bug fixes * noticed the unwinding on Android is broken somehow (need to track down the commit that broke it) * linaro android * repo sync fails due invalid bionic commit id (#885792) * tried to remotely attend the Connect * +1 for having live streams of the plenaries (http://video.ubuntu.com/live/) * -1 for pointing us to the wrong grand sierra irc channels (http://uds.ubuntu.com/participate/remote) * icecast streams worked most of the time (* public holiday on tuesday) Regards Ken

13 years, 8 months

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[ACTIVITY] 2011-11-04

by David Gilbert

=== 64 bit atomics * I got the race in membase down to a futex issue, and asking dmart pointed me at a kernel bug that affects recent kernels where a fix had gone in about a month ago. That was a nasty one! * I've still got a few bugs left; most are turning out to be timing races in the test code (e.g. one that times out after 2seconds but the code takes around 1.7 seconds ish - but if something else gets in trips over the line, and another one where it did a recv_from on a socket but only got the start of a message, presumably because the sender had used multiple sends). It's tricky going because the tests are a combination of most scripting languages (perl, python, ruby with a splash of Erlang). I've so far found no bugs in the atomic code. * I looked at apr and SDL-1.3; both of which use atomics; but end up not using 64bit atomics; the tendency is for them to ensure they can do atomics on long and on a void*; both of which for us are 32bit. === String routines * I've got the Newlib A15 optimised memcpy running in a test harness at the moment for comparison. === Listening to connect * I listened in to a few connect sessions each day; the 1st day or so was 3/4 lost on audio systems that didn't work (I'm especially annoyed at not being able to hear the QEMU for A15/KVM session and toolchain support for kernel). The Rypple session was rather lost through the lack of any screen share or slides.

13 years, 8 months

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Linaro Cross Compiling

by Lalancette, Christopher

Hello all, I've been playing around with linaro and have it working on my Pandaboard locally. I have a couple of questions about the linaro environment; if this is the wrong forum, I'm happy to take it elsewhere. I see that Linaro makes monthly releases of the hwpacks and images. How are the packages/binaries in those images created? Are they cross-compiled, or compiled natively on the target platform? If they are cross-compiled, how is the environment created? The reason I ask is that we've been looking at cross-compiling some packages ourselves, and have been running into issues. So we were wondering what toolchain the linaro community uses. Thanks in advance, -- Chris Lalancette

13 years, 8 months

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Linaro Cross Compiling

by Lalancette, Christopher

Hello all, I've been playing around with linaro and have it working on my Pandaboard locally. I have a couple of questions about the linaro environment; if this is the wrong forum, I'm happy to take it elsewhere. I see that Linaro makes monthly releases of the hwpacks and images. How are the packages/binaries in those images created? Are they cross-compiled, or compiled natively on the target platform? If they are cross-compiled, how is the environment created? The reason I ask is that we've been looking at cross-compiling some packages ourselves, and have been running into issues. So we were wondering what toolchain the linaro community uses. Thanks in advance, -- Chris Lalancette

13 years, 8 months

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[ACTIVITY] Oct 30 - Nov 3

by Ira Rosen

Hi, - Finished rewriting SLP analysis to support not only unary and binary operations. Committed upstream. - Implemented cond_expr support in SLP (for libav weight_h264_pixels). Testing it now. - Vectorizer maintenance (test/bug fixes, patch reviews). Ira

13 years, 8 months

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Todays performance meeting is cancelled

by Ramana Radhakrishnan

We are trying to organise a phone and merge this with the pgo session. Sorry about the short notice. Ramana

13 years, 8 months

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[ACTIVITY] weekly status

by Revital Eres

Testing an initial version of the implementation which estimates register pressure in SMS on libav micro benchmarks. I see 20% improvements in mjpegenc microbench and 11% on aacsbr-2 with SMS. However swscale-rgb24ToY_c still have spills in the final code although it requires maximum 64 VFP_REGS registers out of the available 64 registers so I'm trying to understand the reason for the spill.

13 years, 8 months

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[Activity] Week ending 28th Oct 2011

by Ramana Radhakrishnan

==Progress=== * Off for one day during the week for Diwali. * Connect preparation - Wrote down areas to look at during connect and tried to plan what we want to look at during connect. * Looked at some of the cases with vcond<float> with Ira and helped frame blueprint. * Investigated one of the big performance regressions in the popular embedded benchmark and looked at why it wasn't being vectorized only to realize that it couldn't be. Thanks Ira. Still don't know why ARM state is 22% faster than Thumb2 state. * Looked at the issue with fPIC where GCSE appears to remove a label for sometime but not much progress. === Plans === * Connect ! next week and then vacation. Absences. * 26 Oct - Diwali * 31st Oct - 4th Nov - Linaro Summit Orlando - Travel booked - * 08 Nov - 11 Nov - Vacation booked * Dec 19 - 31st Dec - Vacation booked

13 years, 8 months

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[ACTIVITY] 2011-10-28

by David Gilbert

== 64 bit atomics == * I've been building and testing membase * Version 1.7.1.1 source builds OK (after turning off -Werror due to some of their curious type naming) * The git version fails to build - it doesn't seem consistent * 1.7.1.1 passes simple tests, but there are 3 tests in its test suite that intermittently fail on ARM and seem to be solid on x86. (There are also some that just require timeouts increased due to the relatively slow machine). * t/issue_163.t turned out to be a timing race in the test itself, made worse by being on a relatively slow machine and probably made worse by the Pandas odd idea of timing. That was reported to them with a break down of it, and upstream has fixed their test. ( http://code.google.com/p/memcached/issues/detail?id=230 ) * t/issue_67.t is proving tougher; once in a while memcached will lock up during init in thread_init; there is one particular point where adding a printf will make it work apparently reliably. I've got one or two ideas but I need to check my understanding of pthread_cond_wait first. * There is an assert I've seen triggered once - not looked at that yet. == String routines == * While I was off last week, my memchr and strlen were accepted into newlib * Joseph has responded to my eglibc mail, with a couple of small queries. == Other == * Wrote a more detailed test case for bug 873453 (odd timing behaviour on panda); it's quite odd - I can get > ~80ms timing discrepency so it's not a clock granularity issue. * Replicated a QEMU crash for Peter. Dave

13 years, 8 months

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[ACTIVITY] weekly status

by Ken Werner

Hi, * finished changing libunwind to be more portable * tested patchset on ARM and X86_64 * now builds on Android without modifications (Android.mk, config.h and libunwind-common.h are still required) * verified that the modified debuggerd still works * discussed backtracing using libunwind on ARM with Harald from the BSC * they use libunwind in a sampling tool that generates Paraver tracefiles * started to upgrade my Linaro Android environment and ran into issues * need to check: * why building the toolchain using linaro-build.sh fails * why repo sync fails due to invalid platform/bionic SHA1 * what happened to LEB-panda.xml Regards Ken

13 years, 8 months

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[ACTIVITY] report week 43

by Peter Maydell

RAG: Red: Amber: Green: Current Milestones: || || Planned || Estimate || Actual || ||a15-usermode-support || 2011-11-10 || 2011-11-10 || 2011-10-27 || ||upstream-omap3-cleanup || 2011-11-10 || 2011-11-10 || || Historical Milestones: ||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 || ||qemu-linaro 2011-09 || 2011-09-15 || 2011-09-15 || 2011-09-15 || ||add-omap3-networking || 2011-10-13 || 2011-10-13 || 2011-10-13 || ||a15-systemmode-planning || 2011-10-13 || 2011-10-13 || 2011-09-22 || == a15-usermode-support == * A15 instruction support patches committed upstream in time for upstream's 1.0 release == upstream-omap3-cleanup == * some work on restructuring the omap3 patchset -- it's now basically in the right order and the last 'touches several different bits of code' jumbo patch has been split == other == * sent some patches upstream which address the main things I want to get into qemu 1.0 (PL041 audio support and fixing a regression in handling multithreaded programs in linux-user mode) * A15 KVM planning work and other preparation for Linaro Connect * finally tracked down the qemu-on-ARM memory corruption: we mmap the code generation buffer at 0x1000000 with MAP_FIXED; unfortunately this is now in the middle of glibc's heap... (filed as LP:883133) * qemu now has a coroutine implementation which defaults to using makecontext() if it is present. Unfortunately ARM eglibc provides an implementation which always returns ENOSYS, which is a bit tricky to detect with a compile time configure check (without breaking cross-compilation support). * these two things (and some other known bugs) mean that QEMU on ARM hosts is basically broken, and will probably continue to be since we don't have the spare resource to test and fix bugs (beyond those which we need to fix for KVM-on-ARM)

13 years, 8 months

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[ACTIVITY] w43

by Asa Sandahl

* Looked at how to configure Firefox and how to build different parts of the program. Usage of .mozconfig, myrules.mk and myconfig.mk. * Tested the Talos framework. https://wiki.mozilla.org/Buildbot/Talos. I think it would be good to use Talos for the browsing benchmarks. We can discuss it further at connect. * Preparing for connect. Best Regards Åsa

13 years, 8 months

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[ACTIVITY] WW42

by Zhenqiang Chen

Summary: * Exercise crosstool-ng and summarize the gaps. Details: * Exercise crosstool-ng (1) Sync with lp:~linaro-toolchain-dev/crosstool-ng/linaro. (2) Try to config linux-host-baremental-target an mingw32-host-baremental-target. (3) Try to build the toolchain for both embedded toolchain and linaro-gcc-4.6-2011.10 with the config. . C compiler for linux and mingw32 hosts and c++ compiler for linux host can be built without any change. . C++ compiler for mingw32 host can be built after PCH is disabled. . GDB-cross build fail due to dependence packages. * Gaps in crosstool-ng (1) Improve GDB-cross scripts to download and build the dependence packages: expat and ncurses. Or put expat and ncurses as companion_libraries. (2) To remove dependence, embedded toolchain requires more prerequisites like zlib. New config and scripts are required to support the packages. (3) Currently, the embedded toolchain source packages are released as a tarball, which includes gcc, gmp, etc. New scripts are required to support it. (4) To make sure the toolchain can run with lower version glibc like redhat4/5, the embedded toolchain requires lower version native gcc4.3.6 to build it. To support it, . Users can build the native gcc manually, or . Enhance the scripts to add one step to build native gcc. (5) All the default package configurations are different from embedded toolchain internal build scripts. Since the configurations in embedded toolchain had been tuned and tested, we will change the configurations in crosstool-ng if they do not match and not configurable. The same rule will apply for linaro toolchain. Plans: * Write scripts to re-pack the embedded toolchain source packages. * Add the supports for all prerequisites in crosstool-ng menuconfig. Thanks! -Zhenqiang

13 years, 8 months

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[ACTIVITY] 24th - 28th October

by Andrew Stubbs

Posted a patch upstream to fix big-endian for generic tuning. This was a simple omission from my previous patches. Merged GCC 4.6.2 to Linaro GCC. It's still in testing now, so I'll have to commit it sometime over the weekend or next week. Looked at the benchmark results from Spec2000 running on both A8 and A9 systems, with and with NEON, and with various compiler options. Posted the results in a spreadsheet (visible within Linaro only). Begun making adjustments to generic tuning and started new spec2k runs to see if they are beneficial. First, I'm trying A9 prefetch settings on A8 to see how much damage it does. Next I'll try enabling the A8 NEON tuning settings on A9 to see what happens there. Prepared for travel next week. Vacation Friday

13 years, 8 months

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[ACTIVITY] October 23-27

by Ira Rosen

Hi, - Merged to gcc-linaro: - widening shifts - SLP features: support loads with different offsets and swap operands if necessary - Started rewriting SLP analysis to support operations with more than two operands (towards SLP of conditions) - Updated NEON presentation following Ramana's suggestions (thanks!) - Suggested to Ramana to implement vcond with mixed types, created a blueprint: https://blueprints.launchpad.net/gcc-linaro/+spec/vcond-with-mixed-types - Vectorizer: - updated vectorizer's webpage - updated vectorizer's wiki page - the usual maintenance - Committed upstream two SLP data-ref analysis improvements: PR 50730 and PR 50819 Ira

13 years, 8 months

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Toolchain Connect sessions

by Michael Hope

Hi there. Connect is just around the corner. Have a look at: https://wiki.linaro.org/MichaelHope/Sandbox/Q4.11Plans for a summary of the toolchain sessions and hacking topics. It would be great to have kernel and OCTO input in the ARM STM driver, Kernel debugging, and KVM sessions. -- Michael

13 years, 8 months

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Toolchain performance call during connect.

by Ramana Radhakrishnan

Hi Folks, Draft agenda for the performance meeting next week at Connect - https://blueprints.launchpad.net/gcc-linaro/+spec/linaro-toolchain-performa… Are there any topics that people would like to bring up during this meeting other than the ones listed here ? I suspect that we'll probably just have about 10-15 minutes for a topic in this case. I am not considering discussing PGO related stuff in this session given that we've got another session in which we can discuss this. Thoughts ? cheers Ramana

13 years, 8 months

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Performance improvements hacking time at Connect Q4.11

by Ramana Radhakrishnan

Hi Folks, I've been trying to capture what we want to do in terms of hacking time and some of the performance related backlog that we have in the system. I have done so here. https://wiki.linaro.org/RamanaRadhakrishnan/Sandbox/Q411ConnectGCCPerfPlan I'm on vacation tomorrow but should be picking email for sometime during the day. Thoughts about what else we could be doing in this area or if there's a better way we could use our hacking time. cheers Ramana ---

13 years, 8 months

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Building gcc-linaro 4.6 2011.10 on ubuntu 11.10 32bit for cortex-a9

by Bruno Niklaus

hi@all i try to build the linaro-gcc on a ubuntu host 11.10 32 bit for a cortex a9. but it doenst build to the end. this is the first time ever i try to build a toolchain on my own, so excuse me if its just a beginner-mistake. somebody has any idea? configured like this *./configure --target=arm-linux-gnueabi --disable-bootstrap --enable-languages=c,c++ --with-mode=thumb --with-arch=armv7-a --with-tune=cortex-a9 --with-fpu=neon --with-float=softfp --prefix=/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10* * * no errors when configuring, but it fails during building with this error: *checking for suffix of object files... configure: error: in `/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/arm-linux-gnueabi/libgcc': * *configure: error: cannot compute suffix of object files: cannot compile* *See `config.log' for more details.* *make[1]: *** [configure-target-libgcc] Fehler 1* *make[1]: Verlasse Verzeichnis '/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src'* *make: *** [all] Fehler 2* when i check the ./arm-linux-gnueabi/libgcc/config.log the errors which return 1 are: *configure:3028: /home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/xgcc -B/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/bin/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/lib/ -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/include -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/sys-include -V >&5* *xgcc: error: unrecognized option '-V'* *xgcc: fatal error: no input files* *compilation terminated.* *configure:3039: $? = 1* *configure:3028: /home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/xgcc -B/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/bin/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/lib/ -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/include -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/sys-include -qversion >&5* *xgcc: error: unrecognized option '-qversion'* *xgcc: fatal error: no input files* *compilation terminated.* *configure:3039: $? = 1* *configure:3055: /home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/xgcc -B/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/bin/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/lib/ -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/include -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/sys-include -o conftest -g -O2 conftest.c >&5* */home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/as: line 87: exec: -m: invalid option* *exec: usage: exec [-cl] [-a name] [command [arguments ...]] [redirection ...]* *configure:3058: $? = 1* *configure:3246: checking for suffix of object files* *configure:3268: /home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/xgcc -B/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/bin/ -B/home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/lib/ -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/include -isystem /home/user/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10/arm-linux-gnueabi/sys-include -c -g -O2 conftest.c >&5* */home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/host-i686-pc-linux-gnu/gcc/as: line 87: exec: -m: invalid option* *exec: usage: exec [-cl] [-a name] [command [arguments ...]] [redirection ...]* *configure:3272: $? = 1* *configure: failed program was:* *| /* confdefs.h */* *| #define PACKAGE_NAME "GNU C Runtime Library"* *| #define PACKAGE_TARNAME "libgcc"* *| #define PACKAGE_VERSION "1.0"* *| #define PACKAGE_STRING "GNU C Runtime Library 1.0"* *| #define PACKAGE_BUGREPORT ""* *| #define PACKAGE_URL "http://www.gnu.org/software/libgcc/"* *| /* end confdefs.h. */* *| * *| int* *| main ()* *| {* *| * *| ;* *| return 0;* *| }* *configure:3286: error: in `/home/bruno/pandaboard/linaro/gcc-linaro-4.6-2011.10_src/arm-linux-gnueabi/libgcc': * *configure:3289: error: cannot compute suffix of object files: cannot compile* *See `config.log' for more details.*

13 years, 8 months

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ARM eglibc: adding ucontext?

by Peter Maydell

At the moment ARM eglibc doesn't support the functions declared in ucontext.h: getcontext(), setcontext(), swapcontext() and makecontext(). Instead you get implementations which always fail and set errno to ENOSYS. QEMU uses these functions to implement coroutines. Although there is a fallback implementation in terms of threads, there are reasons why using the fallback is suboptimal: * its performance is worse * it will be less tested, because x86_64 and i386 both implement the ucontext functions and so QEMU on those hosts will be using different code paths * I'm not aware of a good way at configure time to detect whether getcontext() et al will always fail without actually running a test binary, which won't work in a cross-compile setup. (If eglibc just didn't provide the functions at all this would be much simpler...) We're going to care about performance and reliability of QEMU on ARM hosts as we start to support KVM on Cortex-A15, so it would be good if we could add ucontext function support to eglibc as part of that effort. Opinions? Have I missed some good reason why there isn't an ARM implementation of these functions? (I'm aware that the ucontext functions have been removed from the latest version of the POSIX spec; however AFAIK there's no equivalent functionality that replaces them so I think they're still worth having implementations of for parity with other architectures.) -- PMM

13 years, 8 months

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[Activity] Week ending 21st Oct 2011

by Ramana Radhakrishnan

==Progress=== * Some upstream patch review. * Spent time looking at LP 836588 which is a case where CSE removes a particular label access in one case but doesn't remove it from the list of things in the constant pool which is quite bizarre. Will probably need some help with looking into this one. * Sent out vcvt.f32 and vcvt.f64 patches . * Connect preparation - laptop cleanup and getting it finally onto an x86_64 distribution. * Looked at some of the vec_perm / vec_rev cases in Neon with Ira. * Spent some time looking at some of Andrew's issues with generic-v7a tuning especially the cases where it was doing better and gave some suggestions. === Plans === * Prepare for Connect. * Prepare by looking at some of the large differences between various comparative benchmarks. * Some research into PGO related stuff. * Try to upstream some more of my patches in the backlog before the end of the week. * Finish off some internal paperwork. * I'm off on 26th - Wednesday. Absences. * 26th Oct - Day off. * 31st Oct - 4th Nov - Linaro Connect Q4.11 * 08 Nov - 11 Nov - Tentatively booked * Dec 19 - 31st Dec - Tentatively booked

13 years, 8 months

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