Sent the patch which implements register pressure estimation in SMS to
the gcc mailing list as RFC.
I looked at some of the regressions in libav and intend to continue
with that this week.
== Last week ==
* Caught up on lots of email.
* Looked into the SMS regression that Revital found. Turned out to be
caused by the ARM backend not modelling the VMLA fast accumulator path.
Need to know how the path actually works before modelling it
(the docs aren't clear).
* Continued to look at -fsched-pressure.
Richard
Summary:
* Create crosstool-ng patches and build embedded toolchain on ubuntu-8.04.4.
Details:
* Crosstool-ng patches
* Update old patches according to Michael's comments and revise them
according the guideline.
* Create patches for nls option, newlib and gdb.
* Try to build embedded toolchain on ubuntu-8.04.4. It works after
installing all the dependence libraries.
Plans:
* Upstream the patches.
* Build and test.
Thanks!
-Zhenqiang
Hi there. The 4.6-2011.10 release causes an output miscompare failure
in 175.vpr from SPEC 2000. The fault didn't exist in 2011.09 and has
cleared in 2011.11.
Does this ring a bell with anyone? Andrew, could it be related to
your widening multiplies fix?
-- Michael
Hi,
* rewrote the Android.mk of libunwind to make use of autoreconf and libtool
* finished my work on libunwind
* upgraded my Linaro Android build environment
* debugged Linaro Android build failures (#891753)
* tested backtracing on the Linaro Android 2.3.5 and 2.3.7 branches
* documented debuggerd usage on Android:
https://wiki.linaro.org/Platform/Android/DebugAndroidSystemComponents
* Debugged a linking failure of the android perflab benchmark that Andy
is seeing. Turns out that the GCC is optimizing two consecutive calls to
sinf and cosf (same angle) are optimized by the GCC to one sincosf call.
The libm provided by the benchmark is lacking sincosf. Workaround is to
use -fno-builtin-sinf -fno-builtin-cosf.
Regards
Ken
== 64 bit atomics ==
* Still fighting membase
* Cleaned up a bunch of other issues, but I'm back at an 'expiry'
issue, where the test
stores some data with a fixed expiry time and then waits until after
it should have expired,
and checks it has. Except on ARM it sometimes doesn't expire quickly
enough. I've got
enough debug now to see that the server processes view of time (which
it updates via
an event about every second) is sometimes very behind gettimeofday()'s
view of time - and
have a small test for it. This doesn't seem to happen on x86. The
good part is that it's now
a much smaller test, the bad part is that it fails rarely - somewhere
between 1/1000 and 1/100
depending on its mood.
* Looked at a few other things to see if they might use 64 bit atomics:
- spice's (as in the VNC like protocol) FAQ said it needed 64bit
atomics and didn't work
on 32bit machines due to that; but the source appears to have been
fixed for 32bit.
- Looked at boost lock-free; it does have an implementation using
gcc's __sync primitives,
however for ARM it uses a hand coded set of primitives, those are
missing the 64 bit implementation,
but the contributor of the ARM code said that the boost lock-free
author preferred
not to use the gcc primtives.
== Other ==
* Testing latest libffi rc
- Had most of my varargs for hf fix in (had missed one part of a test)
* 1 day of non-linaro work
I'm on holiday next week.
Dave
(short week, 4 days)
RAG:
Red:
Amber: we still haven't settled on engineering blueprints and schedule
for the KVM work. Proceeding with some obviously necessary bits anyway
Amber: not clear whether we can do virtio-mmio this quarter
Green:
Current Milestones:
|| || Planned || Estimate || Actual ||
||upstream-omap3-cleanup || 2011-11-10 || 2011-11-10 || ||
(still no milestones, see above)
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 ||
== upstream-omap3-cleanup ==
* spent a half day on this to try to get this blueprint tidied away
even if we aren't going to have much time for the later upstreaming
== other ==
* A15/KVM planning
* experimenting with getting an A15 kernel booting on Fast Model
(see https://wiki.linaro.org/LoicMinier/Sandbox/FastModels
and https://wiki.linaro.org/PeterMaydell/A15OnFastModels)
* estimated required work for doing a qemu model of a board for
one of the Landing Teams (ans: 6 man months +)
Hi,
- spent most of the week trying to reproduce regressions with vectorization
- started bringing the latest SLP feature, condition with different
types, to gcc-linaro. There are 5 patches. Merged one, started to
prepare another one.
- fixed PR 51112
Ira
Hi,
I've now put this at :
https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2011-11-15
Are there any other topics that folks want to bring up ?
The one thing worth thinking about ahead of time is if we want to
bring ahead the call by an hour to allow Michael to join at a not so
crazy hour for him. What do folks think of 9 a.m. Tuesdays /
Wednesdays UTC ?
cheers
Ramana
Hey
When building u-boot for an ARMv5T platform (versatileqemu_config), the
Ubuntu-packaged Linaro cross-toolchain isn't suitable because it
only offers an ARMv7T2 libgcc. But I'd like the build to fail when
that happens rather than silently generating an u-boot.bin which will
trigger a SIGILL when it hits the first non-ARMv5T instruction.
I heard that gcc/ld are supposed to check this, but I'm not sure how
it's supposed to work; perhaps the way u-boot does its final link
prevents this from working properly?
I tried building u-boot as follows:
make O=obj-broken \
CROSS_COMPILE=arm-linux-gnueabi- ARCH=arm \
OPTFLAGS="-marm -march=armv5te" \
versatileqemu_config
make O=obj-broken \
CROSS_COMPILE=arm-linux-gnueabi- ARCH=arm \
OPTFLAGS="-marm -march=armv5te" \
-j2
The final link looks like this:
UNDEF_SYM=`arm-linux-gnueabi-objdump -x /home/lool/git/denx/u-boot/obj-v-broken/board/armltd/versatile/libversatile.o /home/lool/git/denx/u-boot/obj-v-broken/api/libapi.o /home/lool/git/denx/u-boot/obj-v-broken/arch/arm/cpu/arm926ejs/libarm926ejs.o /home/lool/git/denx/u-boot/obj-v-broken/arch/arm/cpu/arm926ejs/versatile/libversatile.o /home/lool/git/denx/u-boot/obj-v-broken/arch/arm/lib/libarm.o /home/lool/git/denx/u-boot/obj-v-broken/common/libcommon.o /home/lool/git/denx/u-boot/obj-v-broken/disk/libdisk.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/bios_emulator/libatibiosemu.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/block/libblock.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/dma/libdma.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/fpga/libfpga.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/gpio/libgpio.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/hwmon/libhwmon.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/i2c/libi2c.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/input/libinput.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/misc/libmisc.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/mmc/libmmc.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/mtd/libmtd.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/mtd/nand/libnand.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/mtd/onenand/libonenand.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/mtd/spi/libspi_flash.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/mtd/ubi/libubi.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/net/libnet.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/net/phy/libphy.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/pci/libpci.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/pcmcia/libpcmcia.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/power/libpower.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/rtc/librtc.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/serial/libserial.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/spi/libspi.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/twserial/libtws.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/usb/eth/libusb_eth.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/usb/gadget/libusb_gadget.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/usb/host/libusb_host.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/usb/musb/libusb_musb.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/usb/phy/libusb_phy.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/video/libvideo.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/watchdog/libwatchdog.o /home/lool/git/denx/u-boot/obj-v-broken/fs/cramfs/libcramfs.o /home/lool/git/denx/u-boot/obj-v-broken/fs/ext2/libext2fs.o /home/lool/git/denx/u-boot/obj-v-broken/fs/fat/libfat.o /home/lool/git/denx/u-boot/obj-v-broken/fs/fdos/libfdos.o /home/lool/git/denx/u-boot/obj-v-broken/fs/jffs2/libjffs2.o /home/lool/git/denx/u-boot/obj-v-broken/fs/reiserfs/libreiserfs.o /home/lool/git/denx/u-boot/obj-v-broken/fs/ubifs/libubifs.o /home/lool/git/denx/u-boot/obj-v-broken/fs/yaffs2/libyaffs2.o /home/lool/git/denx/u-boot/obj-v-broken/lib/libfdt/libfdt.o /home/lool/git/denx/u-boot/obj-v-broken/lib/libgeneric.o /home/lool/git/denx/u-boot/obj-v-broken/lib/lzma/liblzma.o /home/lool/git/denx/u-boot/obj-v-broken/lib/lzo/liblzo.o /home/lool/git/denx/u-boot/obj-v-broken/lib/zlib/libz.o /home/lool/git/denx/u-boot/obj-v-broken/net/libnet.o /home/lool/git/denx/u-boot/obj-v-broken/post/libpost.o | sed -n -e 's/.*\(__u_boot_cmd_.*\)/-u\1/p'|sort|uniq`; cd /home/lool/git/denx/u-boot/obj-v-broken && arm-linux-gnueabi-ld -pie -T /home/lool/git/denx/u-boot/obj-v-broken/u-boot.lds -Bstatic -Ttext 0x10000 $UNDEF_SYM arch/arm/cpu/arm926ejs/start.o --start-group api/libapi.o arch/arm/cpu/arm926ejs/libarm926ejs.o arch/arm/cpu/arm926ejs/versatile/libversatile.o arch/arm/lib/libarm.o common/libcommon.o disk/libdisk.o drivers/bios_emulator/libatibiosemu.o drivers/block/libblock.o drivers/dma/libdma.o drivers/fpga/libfpga.o drivers/gpio/libgpio.o drivers/hwmon/libhwmon.o drivers/i2c/libi2c.o drivers/input/libinput.o drivers/misc/libmisc.o drivers/mmc/libmmc.o drivers/mtd/libmtd.o drivers/mtd/nand/libnand.o drivers/mtd/onenand/libonenand.o drivers/mtd/spi/libspi_flash.o drivers/mtd/ubi/libubi.o drivers/net/libnet.o drivers/net/phy/libphy.o drivers/pci/libpci.o drivers/pcmcia/libpcmcia.o drivers/power/libpower.o drivers/rtc/librtc.o drivers/serial/libserial.o drivers/spi/libspi.o drivers/twserial/libtws.o drivers/usb/eth/libusb_eth.o drivers/usb/gadget/libusb_gadget.o drivers/usb/host/libusb_host.o drivers/usb/musb/libusb_musb.o drivers/usb/phy/libusb_phy.o drivers/video/libvideo.o drivers/watchdog/libwatchdog.o fs/cramfs/libcramfs.o fs/ext2/libext2fs.o fs/fat/libfat.o fs/fdos/libfdos.o fs/jffs2/libjffs2.o fs/reiserfs/libreiserfs.o fs/ubifs/libubifs.o fs/yaffs2/libyaffs2.o lib/libfdt/libfdt.o lib/libgeneric.o lib/lzma/liblzma.o lib/lzo/liblzo.o lib/zlib/libz.o net/libnet.o post/libpost.o board/armltd/versatile/libversatile.o --end-group /home/lool/git/denx/u-boot/obj-v-broken/arch/arm/lib/eabi_compat.o -L /usr/lib/gcc/arm-linux-gnueabi/4.6.1 -lgcc -Map u-boot.map -o u-boot
I verified that all the .o files passed above have Tag_CPU_name:
"5TE" in their arm-linux-gnueabi-readelf -A output; the only
problematic file is -lgcc.
Note that the final link is done with arm-linux-gnueabi-ld and doesn't
set any architecture; I changed it manually to use gcc and pass the
-marm -march=armv5te, and had to set -nostdlib too when using gcc:
arm-linux-gnueabi-gcc -marm -march=armv5te -nostdlib -pie -T /home/lool/git/denx/u-boot/obj-v-broken/u-boot.lds -Bstatic -Ttext 0x10000 $UNDEF_SYM arch/arm/cpu/arm926ejs/start.o -Wl,--start-group api/libapi.o arch/arm/cpu/arm926ejs/libarm926ejs.o arch/arm/cpu/arm926ejs/versatile/libversatile.o arch/arm/lib/libarm.o common/libcommon.o disk/libdisk.o drivers/bios_emulator/libatibiosemu.o drivers/block/libblock.o drivers/dma/libdma.o drivers/fpga/libfpga.o drivers/gpio/libgpio.o drivers/hwmon/libhwmon.o drivers/i2c/libi2c.o drivers/input/libinput.o drivers/misc/libmisc.o drivers/mmc/libmmc.o drivers/mtd/libmtd.o drivers/mtd/nand/libnand.o drivers/mtd/onenand/libonenand.o drivers/mtd/spi/libspi_flash.o drivers/mtd/ubi/libubi.o drivers/net/libnet.o drivers/net/phy/libphy.o drivers/pci/libpci.o drivers/pcmcia/libpcmcia.o drivers/power/libpower.o drivers/rtc/librtc.o drivers/serial/libserial.o drivers/spi/libspi.o drivers/twserial/libtws.o drivers/usb/eth/libusb_eth.o drivers/usb/gadget/libusb_gadget.o drivers/usb/host/libusb_host.o drivers/usb/musb/libusb_musb.o drivers/usb/phy/libusb_phy.o drivers/video/libvideo.o drivers/watchdog/libwatchdog.o fs/cramfs/libcramfs.o fs/ext2/libext2fs.o fs/fat/libfat.o fs/fdos/libfdos.o fs/jffs2/libjffs2.o fs/reiserfs/libreiserfs.o fs/ubifs/libubifs.o fs/yaffs2/libyaffs2.o lib/libfdt/libfdt.o lib/libgeneric.o lib/lzma/liblzma.o lib/lzo/liblzo.o lib/zlib/libz.o net/libnet.o post/libpost.o board/armltd/versatile/libversatile.o -Wl,--end-group /home/lool/git/denx/u-boot/obj-v-broken/arch/arm/lib/eabi_compat.o -L /usr/lib/gcc/arm-linux-gnueabi/4.6.1 -lgcc -Wl,-Map u-boot.map -o u-boot
But this command works and produces an u-boot ELF which has
Tag_CPU_name: "7-A".
How would I break the build when libgcc isn't ARMv5T?
Thanks,
--
Loïc Minier
Spun Linaro GCC 4.6 release tarball, uploaded it to Michael's server,
and launched the testing.
Continued work on constant reuse optimization. I've now eliminated some
more false positives caused by inconsistent rtx_cost results. It turns
out the pass also fixes up inefficient constants generated by
arm_split_constants, which is nice.
Set yet more spec benchmark runs going as part of the generic tuning
investigation.
Other:
Half day Monday to recover from the weekend's travel.
Half day on internal Mentor activities.
== GDB ==
* Worked on support for cross-platform core file generation.
After some discussion on the mailing list it seems we've
come to an agreement that the remote protocol ought to have
two separate packets related to memory layout, one that
describes the permanent, system-wide layout (for embedded
systems) and one that describes the dynamic, per-process
layout (for processes with memory-mapped files). The latter
also ought to be integrated with the "info proc mappings"
command, which should work with gdbserver too.
I've been working on updating the patches accordingly.
== 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
Testing the SMS register pressure estimation on libav micro benchmarks
and eembc.
Discussed with Ayal the implementation. He had some ideas to consider
regarding the it.
Looking into the regressions of SMSed kernels in libav which are not
related to register pressure:
Consulting with Ayal regarding the case in dsputil-ssd_int8_vs_int16_c
where we have severe regression with SMS; it seemed that the
regression was due to dependence between accumulations that can be
avoided, more specifically we had the following case in vector code:
vec1 = vec1 + ...
...
vec1 = vec1+ ...
...
vec1 = vec1+ ...
...
vec1 = vec1+...
to resolve this, I implemented a hack similar to MVE optimiation in
the loop-unroller as follows:
vec1 = vec1 + ...
...
vec2 = vec2+ ...
...
vec3 = vec3+ ...
...
vec4 = vec4+...
This gives ~4.5% improvements to the non-SMSed version. The SMS
version now shows no regression as the problematic loop which caused
the regression now failed to be SMSed and I'm looking into the reason.
Another regression showed in idct-internal-8 is apparently related to
the do-loop optimziation (SMS actually failed to be applied in this
loop). when applying the patch to expand SMS to recognise doloop then
the regression is resolved.
(http://gcc.gnu.org/ml/gcc-patches/2011-09/msg02051.html; patch is not
in mainline yet)
Summary:
* Add expat and ncurses support for gdb-cross.
* Rebase and create patches for crosstool-ng upstream.
* Compare configurations difference between crosstool-ng and embedded toolchain.
Details:
* Add expat and ncurses support for gdb cross. At this time, all the
packages can be built for both Linux and Mingw32 host with baremetal
target.
* Rebase and create patches for crosstool-ng upstream. Patches are
sent to Michael for review.
* Compare configurations difference between crosstool-ng and embedded
toolchain. To align the configuration, crosstool-ng
* need (not necessary) --disable-nls for companion libs.
* need make document.
* need add --enable-newlib-register-fini config and enhance
CFLAGS_FOR_TARGET for newlib.
* need --disable-sim for gdb.
* need multilib support (Can workaround for current implementation.
Need improvement when it is fully supported).
Thanks!
-Zhenqiang
== 64 bit atomics ==
* Nailed one more of the membase tests; again this was a test
harness race condition (which I've reported here:
http://code.google.com/p/moxi/issues/detail?id=2&thanks=2&ts=1321037460 )
In this case there were two calls to write) performed on the
server, yet the test client performed a single read and
compared the result to what it was expecting; and got lucky on x86 and
about half the time on ARM in that the
server data managed to all get read by the 1st read.
I think this leaves one more case - that I've seen rarely.
== Qemu ==
* Tested Peter's 11.11 pre release; ran into a couple of issues
(vexpress without sound causing hangs, and
the Linaro 11.10 Beagle and Overo images not running X). Also
filed a couple of bugs in l-i-f-ui that
I tripped over while testing it.
== String routines ==
* The new newlib A15 optimised memcpy is slower on an A9 than my
routines; posted to newlib list
asking what the normal way of dealing with a bunch of different
routines is. Would it make sense to get
gcc to define a GCC_ARM_TUNE_CORTEX_A-whatever ?
== Other ==
* Watched the Youtube video of the Kernel/Toolchain discussion -
for those who didn't attend,
I'd encourage a check of the Youtube videos, they're pretty nicely done.
* Got pulled away on non-Linaro work for about half the week.
Dave
Hi,
Android:
* managed to remotely debug a system process (like debuggerd) using
gdbserver
libunwind:
* found an error when unwinding via DWARF debug frames when
configured for REMOTE_ONLY
* discussions on the me revealed that libunwind-ptrace should not be
compiled for REMOTE_ONLY case at all (it was intended for host!=target)
* this means that our current build approach on Android needs to be
changed in the future
Misc:
* internal meetings
Regards
Ken
RAG:
Red:
Amber: upstream-omap3-cleanup stalled, not clear whether we're going
to have any time for it this quarter
Green:
Current Milestones:
|| || Planned || Estimate || Actual ||
||upstream-omap3-cleanup || 2011-11-10 || 2011-11-10 || ||
(Future milestones to be added once post-Connect planning is completed.)
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 ||
== linaro-qemu-11.11 ==
* 2011.11 release: tarball built, tested and released
== other ==
* nailing down A15/KVM work we're going to do this quarter
* usual upstream code review/etc
* sent patches upstream to fix some easy bugs somebody found
running Coverity on QEMU's source code
Hi!
* Ran EEMBC and SPEC on the ursa4. Sorted out a bunch of basic questions
related to permissions ans such with Michael. Familiarized myself with the
scripts for parsing benchmark results.
* Created wiki for running benchmarks in cbuild. It is in my sandbox right
now: https://wiki.linaro.org/AsaSandahl/Sandbox/RunningBenchmark
* Started off SPEC runs for comparing the "train" and "ref" data sets. We
want to know if the changes between variants are the same for the two sets.
Best regards
Åsa
The Linaro Toolchain Working Group is pleased to announce the
release of Linaro QEMU 2011.11.
Linaro QEMU 2011.11 is the latest monthly release of
qemu-linaro. Based off upstream (trunk) QEMU, it includes a
number of ARM-focused bug fixes and enhancements.
New in this month's release:
- The ARM vexpress-a9, versatilepb, versatileab and realview-*
boards now have audio support (thanks to Mathieu Sonet who
contributed a PL041 implementation upstream)
- Support for multiple instances of the "-sd" option on the
command line has been dropped; this was never present in
upstream QEMU and has been removed for consistency. Use
"-drive,if=sd,index=N,file=file.img" for N=0,1,2... instead
- Fixes #886980: 8 and 16 bit reads from the OMAP GPIO module
would crash due to an infinite recursion
- Fixes #823902: problems running multithreaded programs in
linux-user mode
Known issues:
- Graphics do not work for OMAP3 based models (beagle, overo)
with 11.10 Linaro images.
NB: if you run QEMU on a host system without properly configured
audio you might find that QEMU now hangs at some point; you can
fix this by fixing your host system, or work around it by setting
the environment variable QEMU_AUDIO_DRV=none.
If you build from source you may now want to pass configure
a suitable --audio-drv-list=LIST option.
The source tarball is available at:
https://launchpad.net/qemu-linaro/+milestone/2011.11
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
Hi,
- SLP improvements for weight-h264-pixels16x16-8 (libav):
- conditions in SLP - committed upstream
- support pattern detection in SLP - implemented
- enhance mixed condition pattern to handle non-constant then/else
clauses - implemented
weight-h264-pixels16x16-8 now gets vectorized with 2.6x speedup.
- Vectorizer maintenance (bug fixes, patch reviews).
I'll be on vacation on Sunday.
Ira
Hi there,
As discussed with Loïc, please find attached my slides to the ELCE presentation related to our implementation of linux-awareness for JTAG debugging. I still need a formal clearance of my organization on my contribution patch, but I (and my managers) will be happy to see some or all of this work benefit to-and-from the community. If you are interested, I will try to upload a self-contained qemu-based demo to a public ftp.
Cheers,
Marc Titinger.
> -----Original Message-----
> From: Loïc Minier [mailto:lool@dooz.org]
> Sent: Wednesday, November 02, 2011 3:19 PM
> To: Marc TITINGER
> Cc: Michael Hope; Ulrich Weigand
> Subject: Re: contribution Linux Kernel Debugger
>
> On Wed, Nov 02, 2011, Marc TITINGER wrote:
> > J'ai été content de vous rencontrer toi et Nicolas à la suite de ma
> > présentation pour discuter de l'opportunité de la contribution de
> > notre debugger linux. J'ai une question: dans la mesure ou STMicro ne
> > fait pas partie des membres de linaro, aurais-je un accès restreint
> > aux outils et discussions si je souhaite contribuer? Quels serons les
> > blueprints correspondant à ce projet ?
>
> Most things Linaro does are public; concerning the toolchain,
> benchmarks are kept private due to licensing constraints. Even if
> STMicro is not a member, you're welcome to present your ideas and code
> to us (we don't mind if STMicro joins as a member though ;-).
>
> We covered topics similar to your ELC-Europe talk this week:
> https://blueprints.launchpad.net/linaro-toolchain-misc/+spec/linaro-
> toolchain-kernel-debugging
>
> Ulrich Weigand and Michael Hope will continue discussions around where
> we will go in terms of helping kernel debugging next cycle, it might
> be
> that we end up working on similar areas than the ones you and I
> discussed (special handling for linux in GDB -- tasks, backtracing
> across kernelspace/userspace; OpenOCD fixes...).
>
> Your slides don't seem to be at
> https://events.linuxfoundation.org/events/embedded-linux-conference-
> europe/titinger
> yet, so perhaps you could share a link with Michael and Ulrich? or
> post on the linaro-toolchain@ mailing-list
>
> We'll be a bit busy this week, but if you want to discuss your
> patches,
> upstreaming, further developments, I would think Michael can arrange
> for you to join a Toolchain WG call in the next weeks -- Michael, I'll
> let you comment once you get to see the slides :-)
>
> --
> Loïc Minier
Summary:
* Add zlib and libiconv support in crosstool-ng and repack embedded
toolchain source package.
Details:
* Read crosstool-ng scripts, configs and document to learn on how it works.
* Try mkedwards's extensions for crosstool-ng at
https://github.com/mkedwards/crosstool-ng. It does have lots of
extensions, the GDB-cross can build. But zlib and libiconv do not meet
our requirement.
* Add config, patch and build scripts for zlib and update the binutils
build scripts to use the prebuilt zlib.
* Add config and build scripts for libiconv and update the build
scripts of gcc and gdb.
* Write scripts to patch and repack embedded toolchain source packages
to the standard format.
Plans:
* Linaro connect: Oct. 31 - Nov. 4.
* Integrate the repack scripts with crosstool-ng.
Thanks!
-Zhenqiang
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
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.
