...are available here:
https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2010-08-16
Activity reports are included below.
-- Michael
Attendees
Name Email IRC Nick
Andrew Stubbs andrew.stubbs(a)linaro.org ams
Julian Brown julian(a)codesourcery.com jbrown
Loïc Minier loic.minier(a)linaro.org lool
Matt Gretton-Dann ARM
Matthias Klose doko(a)canonical.com doko
Michael Hope michael.hope(a)linaro.org michaelh
Peter Maydell peter.maydell(a)linaro.org pm215
Ulrich Weigand ulrich.weigand(a)linaro.org uweigand
Yao Qi yao.qi(a)linaro.org yao
Agenda
• Benchmarks
□ ffmpeg (h.264), libmad (mp3), LAPACK, CoreMark, Dhrystone, and memcpy()
□ EEMBC
□ Methods of benchmarking
• Patch tracking
□ Minimum features
□ Discovering upstream patches to backport
□ Example version at http://ex.seabright.co.nz/helpers/patchtrack
□ Ticket view at http://ex.seabright.co.nz/helpers/tickets
• Upstream tracking
□ Ubuntu tracks release+SVN. What should we do?
• memcpy() and friends
□ https://wiki.linaro.org/WorkingGroups/ToolChain/StringRoutines
□ Copyright issues with EGLIBC
• Hardware status
• Creating blueprints
• Connecting with other groups
• Open tickets
□ 616141 Backport the sync_* primitive fixes
□ 590696 fix wrong use of objdump during cross build
□ 600277 Backport ARM Cortex A9 scheduling changes
□ 605059 Merge 4.4.5
Action Items from this Meeting
• ACTION: Michael to think about synchronising Linaro releases with upstream
• ACTION: Michael to organise a call with Matthias, Loic to continue the
topic
• ACTION: Michael to write up and email patch tracker mechanics for review
• ACTION: Ulrich to add his time away to the Linaro calendar
• ACTION: Michael and Ulrich to add GDB new features as blueprints to
Launchpad
• ACTION: Andrew to look into frequent runs of CSL benchmarks
• ACTION: Michael to make sure Linaro has a FSF copyright assignment
agreement
Action Items from Previous Meeting
• DONE: Richard to ask the GCC developers on IRC what the status of 4.4.5 is
□ Matthias talked with Jacob and they expect a release at the end of
August
• DONE: Andrew to merge 4.5.1 and the Firefox fix by 2010-08-17
• DONE: Ulrich to ticket GDB items
• DONE: Michael to understand whiteboards as a way of organising features
Minutes
Upstream patches:
• Loic, Matthias, and Michael discussed tracking the upstream release branch
• Upstream has a roughly three week cycle on patch releases
• Matthias tracks this release branch and pulls in SVN as a patch into Ubuntu
• Michael is concerned about the extra work, pulling a partial
□ feature, catching a regression, fallout due to releasing something that
upstream hasn't released,
• Release branches are very stable. Chance of a regression is low
• Better chance of getting a problem fixed upstream if caught early before
the release
• Loic: harder to track upstream
• Loic: also harder to identify a Linaro release -
FSF-4.4.4+svr12345+bzr6789...
• Matthias spoke with Jacob in GCC. They expect a release at the end of
□ August
• Michael prefers basing on released versions only
• Michael also wants to be able to reproduce any issues found in Ubuntu. Hard
at the
□ moment as Ubuntu runs Linaro plus a reasonably large set of patches
ts to be able
• One approach: merge the day after the Linaro release. Gives the maximum
time for
□ testing. Still a month behind, still have Ubuntu GCC != Linaro GCC
• Matthias
□ Would continue to keep diff between Linaro and upstream
□ Is doing changes upstream
□ Would have to maintain those separately
□ If there are release critical changes, would have to do them himself
• Discussed different phase of Linaro GCC vs Ubuntu - the releases won't be
in sync so there will always be a need for release critical fixes in Ubuntu
• ACTION: Michael to think about synchronising Linaro releases with upstream
□ Drift the Linaro release to be a week later than the upstream release
• Andrew wasn't concerned. Noted that the release branches are really good
• ACTION: Michael to organise a call with Matthias, Loic to continue the
topic
Patch tracking:
• Cortex-A5 changes are coming into Linaro
• Michael did a quick show and tell on the patch tracker hack
• ACTION: Michael to write up and email patch tracker mechanics for review
Other topics:
• Ulrich is out on vacation next week
• ACTION: Ulrich to add his time away to the Linaro calendar
• ACTION: Michael and Ulrich to add GDB new features as blueprints to
Launchpad
• Michael noted that we use bzr for version control wherever possible,
including for QEMU
• Michael asked Andrew if we could start regular runs of the commonly used
benchmark
• ACTION: Andrew to look into frequent runs of CSL benchmarks
• String routines
□ Michael talked with upstream and they greatly prefer FSF+LGPL
□ ACTION: Michael to make sure Linaro has a FSF copyright assignment
agreement
• Loic mentioned Valgrind patches
□ Peter is interested in helping
Next meeting is a stand-up meeting on 2010-18-11 on the public code.
-- Julian Brown
== GCC 4.5 bugs in Launchpad ==
* Attempted to reproduce bugs against Linaro GCC 4.5 in
Launchpad: issues #614184, #614185 and #614186. The last of these has
been closed as invalid by the submitter already, and the first two don't
seem to reproduce using a cross-compiler (i.e. using CS's build
machinery), nor with a natively-bootstrapped bzr head build (as of some
day last week). So, no real progress there.
== GCC 4.5 vectorization improvements ==
* Started tracking down the causes of some failures in vect.exp:
pr43430-1.c failed because of missing vector comparison support. This
seemed relatively straightforward to implement using NEON instructions,
so I had a go at doing that. Similarly another test fails (vect-35.c)
because of missing support for widening/narrowing patterns, though I'm
still investigating a fix for that.
-- Andrew Stubbs
== Linaro GCC releases ==
* Merged GCC 4.5.1 into the Linaro sources.
* Respun the 4.5-2010.08 release.
== Linaro GCC 4.5 ==
* Continued pushing SG++ patches into Linaro. I'm now most of the way
through these, but I had hoped to have had it done by now.
== Other ==
* Lost a few hours to internet outages. An engineer came out and
changed all the connections, so hopefully that's solved the problem.
It seems the recent bad weather had got into the underground cables
between here and the street cabinet. It's fibre from there, so in
theory it must be local.
* Took Wednesday as vacation.
-- Peter Maydell
Subject: [weekly][linaro] report week 32
RAG:
Red: None
Amber: ARM legal OK for qemu contributions
Green: booted versatile+virtio kernel on qemu
Milestones: none as yet
Progress:
virtio-system:
- identified which qemu patches give a qemu which can boot linaro
alpha-3 on beagle emulation
- built a kernel for 'versatile' flavour with virtio support
- found some patches from qemu upstream which are needed for
newer versatile kernels to boot
- got my versatile kernel running on qemu with the linaro
rootfs mounted via virtio
- put various qemu changes/patches into a git tree, so (a) I
know what I changed and (b) as an exercise in learning git
Issues: none
Plans:
virtio-system:
- get versatile to boot *without* virtio for comparison
- find an io benchmark and do some benchmarking
qemu-focused-kernel:
- flesh out this blueprint
Absences:
None planned.
-- Chung-Lin Tang
== libffi VFP hard-float support ==
Testsuite fixes and final tuning before submitting. Had to port some
stuff from the GCC testsuite to let libffi's testsuite support a
dg-skip-if option, to skip some variadic function tests based on
compiler options (skip when -mfloat-abi=hard), and I am not a
DejaGNU/expect/Tcl expert...:P Whole patch was submitted to main
libffi mailing list on Sunday, waiting for feedback.
(see http://sourceware.org/ml/libffi-discuss/2010/msg00153.html)
== This week ==
* See if any feedback on libffi patch.
* Start Linaro 4.5 EEMBC comparisons.
* Catch up on GCC work.
-- Yao Qi
== Linaro GCC ==
* Pinged ARM backend maintainer for my patch to GCC PR45094. Still
no response.
* Submit my patch on ARM target triplet in gcc-patches. With Dan's
help, got GCC write access. Checked in my patch.
* Update status of LP bugs. Mark them as Fix Released since
failures go away in gcc-linaro-4.4-2010.08-0.
== Linaro GDB ==
* Search something about GDB from my brain, like gdb test,
tcl/expect, ptrace/breakpointetc. Fortunately, most of
them are still there. :)
* LP:615997 gdb.dwarf2/dw2-ref-missing-frame.exp failure
Failure is caused by alignment of test case. Sent a patch to
gdb-patches, and revise it with Dan's help.
* LP:615989 gdb.base/pending.exp
Failure is caused by wrong code in .debug_line. Failure goes away
when it is compiled by gcc-linaro-4.5-2010.08-1.
Open a gcc bug LP:617384.
* LP:615995 gdb.base/watch-vfork.exp : Watchpoint triggers after
vfork (sw) (timeout)
Reproduce it on x86. GDB is waiting endlessly between
TARGET_WAITKIND_FORKED and TARGET_WAITKIND_VFORK_DONE. Looks like
child of debuggee hangs on 'signal'.
== This Week ==
* Look into LP:615995 deeply, and other linaro gdb bugs.
Hi
I'm concerned that the workaround for apr was just uploaded in the form
of disabling process shared mutexes (see LP #599874), but we didn't
address or investigate the root cause in eglibc.
Would someone be able to look at LP #604753 where the issue is tracked?
Thanks!
--
Loïc Minier
...is available at:
https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2010-08-16
-- Michael
Agenda
• Benchmarks
□ ffmpeg (h.264), libmad (mp3), LAPACK, CoreMark, Dhrystone, and memcpy()
□ EEMBC
□ Methods of benchmarking
• Patch tracking
□ Minimum features
□ Discovering upstream patches to backport
□ Example version at http://ex.seabright.co.nz/helpers/patchtrack
□ Ticket view at http://ex.seabright.co.nz/helpers/tickets
• Upstream tracking
□ Ubuntu tracks release+SVN. What should we do?
• memcpy() and friends
□ https://wiki.linaro.org/WorkingGroups/ToolChain/StringRoutines
□ Copyright issues with EGLIBC
• Hardware status
• Creating blueprints
• Connecting with other groups
• Open tickets
□ 616141 Backport the sync_* primitive fixes
□ 590696 fix wrong use of objdump during cross build
□ 600277 Backport ARM Cortex A9 scheduling changes
□ 605059 Merge 4.4.5
Blueprint Assignee
Initial delivery of Linaro GCC 4.4 ams
Cross Compiler Packages hrw
Action Items from this Meeting
• TBD
Action Items from Previous Meeting
• ACTION: Richard to ask the GCC developers on IRC what the status of 4.4.5
is
• ACTION: Andrew to merge 4.5.1 and the Firefox fix by 2010-08-17
• ACTION: Ulrich to ticket GDB items
• ACTION: Michael to understand whiteboards as a way of organising features
...are here:
https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2010-08-11
-- Michael
Attendees
• Name Email IRC Nick
Yao Qi yao.qi(a)linaro.org yao
Ulrich Weigand ulrich.weigand(a)linaro.org uweigand
Richard Earnshaw richard.earnshaw(a)arm.com rearnshaw
Peter Maydell peter.maydell(a)linaro.org pm215
Michael Hope michael.hope(a)linaro.org michaelh
Julian Brown julian(a)codesourcery.com jbrown
Chung-Lin Tang cltang(a)codesourcery.com cltang
Agenda
• Stand up call
Blueprint Assignee
Initial delivery of Linaro GCC 4.4 ams
Cross Compiler Packages hrw
Action Items from this Meeting
• ACTION: Michael to email his configure options to Julian
• ACTION: Richard, if he's going, will set up
Action Items from Previous Meeting
Minutes
• Julian
□ Continues to merge 4.4 into the CSL 4.5 branch
□ Andrew is pushing changes out to the Linaro branch
□ Can't reproduce some failures
□ ACTION: Michael to email his configure options to Julian
• Ulrich
□ Has been ticketing the GDB features and faults for him and Yao to work
on
• Yao
□ GCC patch has been approved upstream
□ Going through the GDB tickets
• Chung-Lin
□ Doing some last optimisations
□ Preparing to send the patch upstream
• Peter
□ Looking into virtio
□ Amit has been working on similar
□ Michael suggests getting on IRC and asking
□ Almost has approval to work publicly
• Richard
□ Issues were found with the sync fixes. These are being reworked
• Michael
□ Looked at benchmarks and string routines
□ Want the group to start pulling the A9 changes down
□ And other A9 pipeline changes
□ Richard suggests pulling Marcus's 4.4 sync primitives fix in too
• GCC Summit
□ Overlaps with UDS
□ Ulrich suggests a BoF session on the ARM toolchain
□ ACTION: Richard, if he's going, will set up
□ Not enough material for a paper at the moment
The next meeting is the stand up call on Friday.
I wanted to point somebody at this mailing list (linaro-toolchain),
and I noticed that it wasn't listed here:
https://wiki.linaro.org/GettingInvolved
which is the first place I tried. Is that deliberate, or just an oversight?
thanks
-- Peter Maydell
Hi Michael,
here's a list of features and bugfixes that can serve as a basis for
Monday's discussion on what we should be working on in GDB in the future.
The goal of the list is to fix currently known problems with GDB, including
the testsuite, as well as bringing GDB on ARM in line with other platforms
by adding required back-end support to enable common GDB features that are
already supported elsewhere. It does not yet include anything completely
new that we'd develop specifically for ARM.
If anybody knows of a feature or bugfix I've missed, please let me know!
Features/fixes involving kernel support:
- hardware watchpoint support
- Neon registers in core files
- Interrupted syscall handling
- PTRACE_ATTACH disabled ?
Features/fixes involving GCC support:
- backtrace from abort (missing LR save)
- debug info for args in varargs routine
GDB features/fixes:
- prologue parsing on Thumb-2
- displaced stepping on Thumb
- syscall tracing support
- improved epilogue detection (fix software watchpoints)
- multi-threaded debugging inferior crashes
- multi-threaded Thumb/ARM state tracking
- signal handler stepping
- inferior call fixes
- misc. other testsuite regressions
gdbserver features/fixes
- Neon register support
- fast tracepoints
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
= Friday 7th August 2010 =
== This month's meetings ==
<<MonthCalendar(WorkingGroups/ToolChain/Meetings,2010,08,,,,WorkingGroups/ToolChain/MeetingTemplate)>>
== Attendees ==
||<rowbgcolor="#333333" rowstyle="color: white; font-weight:
bold;"style="text-align: center;">Name ||<style="text-align:
center;">Email ||<style="text-align: center;">IRC Nick ||
|| Andrew Stubbs || andrew.stubbs(a)linaro.org || ams ||
|| Chung-Lin Tang || cltang(a)codesourcery.com || cltang ||
|| Julian Brown || julian(a)codesourcery.com || jbrown ||
|| Marcin Juszkiewicz || marcin.juszkiewicz(a)linaro.org || hrw ||
|| Michael Hope || michael.hope(a)linaro.org || michaelh ||
|| Peter Maydell || peter.maydell(a)linaro.org || pm215 ||
|| Richard Earnshaw || richard.earnshaw(a)arm.com || rearnshaw ||
|| Ulrich Weigand || ulrich.weigand(a)linaro.org || uweigand ||
|| Yao Qi || yao.qi(a)linaro.org || yao ||
== Agenda ==
* Stand up meeting
== Action Items from this Meeting ==
== Action Items from Previous Meeting ==
== Minutes ==
* Andrew:
* Continues to push the 4.5 patches
* Seen one regression so far which he is investigating
* Continues to approve 4.4 merge requests
* Spinning 2010.08 release today
* Will give tarball to michaelh to also build
* Yao:
* Continuing on bug fixes and merges
* [[LP:602174]]: Problem has gone away, to confirm on release
* [[LP:602288]]: Leave test in-place. Change was backed out
* [[LP:602190]]: will set options in test case
* Ulrich:
* Investigating test failures
* getfem++ failure is triggered in wrapped library
* May be due to a different environment
* Will investigate further
* Richard:
* Cortex-A9 patches sent upstream
(http://gcc.gnu.org/ml/gcc-patches/2010-08/msg00481.html)
* `__sync` primitive patches sent upstream
(http://gcc.gnu.org/ml/gcc-patches/2010-08/msg00492.html)
* Peter
* Introduced himself
* Julian:
* Porting patches from 4.4 to the 4.5 CSL branch is ongoing
* Continuing with the misalignment patch issues
* Looking into failures on the 4.5 CSL branch
* Michael asked Julian to look at the 4.5 tests on Linaro as well
* Marcin:
* All stages of the cross compiler are done
* Sent a link to the PPA over IRC
* Mentioned that configure objcopy issue. Michael says that the
TCWG will take it over
* Vacation is coming up in about a week
* Chung-Lin:
* Now running the libffi test suite
* Four regressions so far
* Andrew is organising access to the benchmark suite
* Michael: do want to be able to reproduce these results in the
future. Please record everything needed to reproduce (compiler, host,
environment, scripts, etc.)
* Michael:
* Extending the builds further. Added eglibc.
* Thinking about what's next
* Discuss on Monday
LP:602190(https://bugs.launchpad.net/gcc-linaro/+bug/602190) and
LP:602285(https://bugs.launchpad.net/gcc-linaro/+bug/602285) are
related to this patch below. You can get more details from comments
of these bugs, since I've added my understand of the cause in
comments.
This patch is to improve the performance of generated code, however,
these two bugs are related to this patch(, correct me if I am wrong).
Now, we have two options, 1) revert this patch, and make these test
case pass; 2) keep this patch and fix test cases, 3) fix bugs and keep
this patch,
What do you think?
2009-08-26 Daniel Jacobowitz <dan(a)codesourcery.com>
Issue #6131 - Enable additional optimizations by default in Lite
Issue #6103 - Reduce default unrolling parameters at -O3
* release-notes-csl.xml (Improved optimization for ARM): New note.
gcc/
* config/arm/arm.c (arm_override_options): If flag_unroll_loops has
the default value, adjust unrolling parameters.
(arm_optimization_options): Set flag_unroll_loops to a default value.
Enable flag_promote_loop_indices.
Modified: gcc/config/arm/arm.c
==============================================================================
--- gcc/config/arm/arm.c (original)
+++ gcc/config/arm/arm.c Fri Aug 28
14:41:19 2009
@@ -55,6 +55,7 @@
#include "langhooks.h"
#include "df.h"
#include "intl.h"
+#include "params.h"
/* Forward definitions of types. */
typedef struct minipool_node Mnode;
@@ -1857,6 +1858,29 @@
warning (0,
"-low-irq-latency has no effect when compiling for the
Thumb");
low_irq_latency = 0;
+ }
+
+ /* CSL LOCAL */
+ /* Loop unrolling can be a substantial win. At -O2, limit to 2x
+ unrolling by default to prevent excessive code growth; at -O3,
+ limit to 4x unrolling by default. We know we are not optimizing
+ for size if this is set (see arm_optimization_options). */
+ if (flag_unroll_loops == 2)
+ {
+ if (optimize == 2)
+ {
+ flag_unroll_loops = 1;
+ if (!PARAM_SET_P (PARAM_MAX_UNROLL_TIMES))
+ set_param_value ("max-unroll-times", 2);
+ }
+ else if (optimize > 2)
+ {
+ flag_unroll_loops = 1;
+ if (!PARAM_SET_P (PARAM_MAX_UNROLL_TIMES))
+ set_param_value ("max-unroll-times", 4);
+ }
+ else
+ flag_unroll_loops = 0;
}
}
@@ -21175,6 +21199,17 @@
set_param_value ("max-inline-insns-single", 1);
set_param_value ("max-inline-insns-auto", 1);
}
+ else
+ {
+ /* CSL LOCAL */
+ /* Set flag_unroll_loops to a default value, so that we can tell
+ if it was specified on the command line; see
+ arm_override_options. */
+ flag_unroll_loops = 2;
+ /* Promote loop indices to int where possible. Consider moving this
+ to -Os, also. */
+ flag_promote_loop_indices = 1;
+ }
}
--
Yao Qi
CodeSourcery
yao(a)codesourcery.com
(650) 331-3385 x739
