Please find the activity reports and minutes for Monday's meeting below. The minutes are also available at: https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2010-08-23
Minutes from the Wednesday and Friday standup calls are at: https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2010-08-18 https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2010-08-20
-- Michael
Attendees
• Name Email IRC Nick Andrew Stubbs andrew.stubbs@linaro.org ams Chung-Lin Tang cltang@codesourcery.com cltang Matthias Klose doko@canonical.com doko Michael Hope michael.hope@linaro.org michaelh Peter Maydell peter.maydell@linaro.org pm215 Richard Earnshaw richard.earnshaw@arm.com rearnshaw Yao Qi yao.qi@linaro.org yao
Agenda
• 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 • Upcoming release □ GCC 4.4 □ GCC 4.5 □ GDB □ Strings • 4.6 backport approach • Creating blueprints • Connecting with other groups
Blueprint Assignee Initial delivery of Linaro GCC 4.4 ams Cross Compiler Packages hrw
Action Items from this Meeting
• ACTION: Chung-Lin to move the list of other backports out of the CSL wiki and into Linaro • ACTION: Michael to re-check with TSC that we can assign copyright but keep ability to relicense • ACTION: Yao to continue on GDB for a week then switch to investigation • ACTION: Peter to check into the state and progress of valgrind for the meeting on the 30th.
Action Items from Previous Meeting
Minutes
Tickets:
• Went through the open tickets in the agenda • Andrew will backport the SMP changes, including the sync primitives • Andrew will backport the A9 changes □ Most of the changes should come through easily □ There is a write after write hazard □ Currently uses the new cost infrastructure □ Backport the cost infrastructure if it will be used further in the future
4.6 branch:
• Andrew suggested starting a 4.6 branch after the start of stage 3 □ Start landing patches early □ When FSF 4.6.0 comes out, we will have a corresponding Linaro 4.6.0 • ACTION: Chung-Lin to move the list of other backports out of the CSL wiki and into Linaro
String routines:
• Richard asked about the response • Michael had replies from Roland McGrath (http://sourceware.org/ml/ libc-alpha/2010-08/msg00029.html) but not the wider gcc-sc • All other architectures are LGPL and FSF assigned • The current approach is to assign a particular version to glibc • Could cause a small maintenance problem in the future • Richard isn't sure that we can assign copyright of a particular version • ACTION: Michael to re-check with TSC that we can assign copyright but keep ability to relicense
4.6 backports:
• Talked about the approach for backporting 4.6 features • Won't backport every single change as then Linaro 4.5 becomes FSF 4.6 • Backport correctness fixes as the problem is found • Backport performance changes as they occur • Discussed how upstream could be tracked □ Notification of any CSL or ARM authered changes will come from them □ All changes are supposed to go through gcc-patches □ Andrew notes that gcc-cvs provides a filtered view of what actually landed □ At least monitor these lists and search for ARM|Thumb|NEON|XSCALE| Cortex|Coretx|VFP|Snapdragon|OMAP
Michael noted that IBM are interested in the ARM compiler and plan to get involved soon.
Michael has asked again for A9 hardware. No news yet.
Future:
• Would like to spend some time soon running invetigrations to spit out some blueprints • ACTION: Yao to continue on GDB for a week then switch to investigation • Andrew noted that there is one more person to come from CSL • Will ask that person to do investigation • Richard is keen to see the blueprints to check against what ARM is doing □ Michael asked for information about their planning process so that we can line things up
Valgrind:
• Peter noted that the valgrind changes have been committed upstream • ACTION: Peter to check into the state and progress of valgrind for the meeting on the 30th.
Next meeting is a stand-up meeting on 2010-08-25 on the public code.
--- Andrew Stubbs == GCC 4.5 ==
* Continued pushing 4.5 patches to Linaro. I have now caught up with current development I think.
* Lots of discussion on the patch tracker. You'd think it was more important than the compiler .... :(
== Upstream ==
* Did before and after tests of the Coretex-A5 scheduler against upstream HEAD. All seemed well (or at least, no worse) so I've posted the patch upstream. No word back yet ....
--- Chung-Lin Tang == Hard-float == * Testing EEMBC softfp vs. hard-float calling convention performance numbers.
* The only conclusive result was that OAmark is 2%-3% faster, presumably due to vector graphics-like code in that suite. May look into other code (was suggested Cairo) to see if any gain in changing to hard-float.
* Withdraw earlier comment on small improvements on Automark (was not apparent after more experiment runs).
* Currently working to produce report files.
== Linaro GCC == * Looking at getting into GCC backport work this week.
--- Yao Qi
== Linaro GDB ==
* LP:615997 gdb.dwarf2/dw2-ref-missing-frame.exp failure Patch is committed to gdb mainline.
* LP:615999 gdb.gdb/selftest.exp failure Patch is committed to gdb mainline.
* LP:615995 gdb.base/watch-vfork.exp : Watchpoint triggers after vfork (sw) (timeout) With Pedro's help, got to know the failure of this case on arm and x86 are different. Created a patch as Ulrich suggested, and it works on 2.6.32, while fails in a different way on 2.6.35. Failure is caused by debuggee process is killed by a SIGTRAP. Still no clue why that can happen.
== Linaro GCC ==
* My patch to PR45094 is approved, and checked in to mainline.
== This Week ==
* Fix LP:615995 and other linaro gdb bugs.
--- Ulrich Weigand
== GCC ==
* Collected and wrote up suggestions for future GCC work
== GDB ==
* Opened Launchpad bugs for known GDB problems and testsuite failures * Investigated bug #620595 (gdb.threads/threxit-hop-specific.exp failure) * Fixed bug #615998 (gdb.gdb/observer.exp failures) in mainline and 7.2 * Worked on upstream fix for #620595 (gdb.threads/threxit-hop-specific.exp failure) * Analyzed bug #620611 (Unable to backtrace out of vector page 0xffff0000)
== Infrastructure ==
* Continued working with our order&control team to acquire IGEPv2 boards
--- Peter Maydell
RAG: Red: None Amber: ARM legal OK for qemu contributions still pending Green: we have approval for laptops for linaro secondees
Milestones: | Planned | Estimate | Actual | finish virtio-system | 2010-08-27 | 2010-08-27 | |
Progress:
virtio-system: - got my versatile kernel/qemu running with virtio disk and network versus non-virtio - ran some basic benchmarking (bonnie++ for disk, tbench for net). Disk is faster with virtio, but strangely networking is not! - tried an upstream qemu too -- net virtio still slower - built a realview kernel in preparation for testing Arnd's PCI patches on hardware
qemu-focused-kernel: - some research into which ARM dev boards support PCI in hardware, kernel and qemu, to try to find a good choice for basing a qemu-focused kernel on
merge-other-branches: - started compiling list of qemu branches for possible consolidation
Issues: the intersection of (recent ARM hardware) (PCI support) and (supported in qemu) looks suspiciously like the empty set.
Plans: virtio-system: - borrow some versatile or realview hardware and test Arnd Bergmann's PCI patches - make a start on writing up the config/benchmark results qemu-focused-kernel: - flesh out this blueprint valgrind: - try to build an ARM valgrind from upstream's thumb branch
Absences: Friday 5 November and 20 other days in this calendar year