QEMU Tooling ([VIRT-252])
=========================
QEMU plugin support ([VIRT-280])
- posted {PATCH for semihosting-tests} semihosting tests: add v7m
tests Message-Id: <20190711135726.14191-1-alex.bennee(a)linaro.org>
- semihosting re-factor now in v4 branch
- cleaned up translator_ld stuff for arm
- posted {PATCH for 4.1?} includes: remove stale {smp|max}_cpus
externs Message-Id: <20190711130546.18578-1-alex.bennee(a)linaro.org>
- fixed up code needing smp/max_cpus
[VIRT-280] https://projects.linaro.org/browse/VIRT-280
[v4 branch] https://github.com/stsquad/qemu/tree/plugins/plugins-v4
GSoC Mentoring ([VIRT-348])
- starting to look quite workable
- looks like chunks of CONFIG_PROFILER can be made runtime
select-able
Upstream Work ([VIRT-109])
==========================
- more regression hunting for 4.1 release
- looked at bugs [1834496] and [1836078]
- posted {PATCH v2 for 4.1} target/arm: report ARMv8-A FP support
for AArch32 -cpu max Message-Id:
<20190711103737.10017-1-alex.bennee(a)linaro.org>
- rth and pm215 also posted various fixes
- ieee_6 test looks like a [fortran/gcc runtime issue]
- posted {PATCH for 4.1? v1 0/7} testing/next (docker, win-cross)
Message-Id: <20190712111849.9006-1-alex.bennee(a)linaro.org>
[VIRT-109] https://projects.linaro.org/browse/VIRT-109
[1834496] https://bugs.launchpad.net/bugs/1834496
[1836078] https://bugs.launchpad.net/bugs/1836078
[fortran/gcc runtime issue]
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78314
Completed Reviews [5/5]
=======================
{PATCH 0/5} tcg: Fix mmap_lock assertion failure, take 2
Message-Id: <87zhlned2x.fsf(a)zen.linaroharston>
{PATCH for-4.1} target/arm: Set VFP-related MVFR0 fields for arm926 and arm1026
Message-Id: <20190711121231.3601-1-peter.maydell(a)linaro.org>
{PATCH for-4.1 0/2} Compatibility fixes for nettle 2.7 vs 3.0 vs 3.5
Message-Id: <20190712101849.8993-3-berrange(a)redhat.com>
{PATCH v2 0/5} tests/docker: add podman support
Message-Id: <20190709194330.837-1-marcandre.lureau(a)redhat.com>
- CLOSING NOTE [2019-07-12 Fri 18:07]
Looks ok - need to get a podman system up for testing
{RISU PATCH v3 00/18} Support for generating x86 SIMD test images
Message-Id: <20190711223300.6061-5-jan.bobek(a)gmail.com>
Absences
========
- 18-19th July
Current Review Queue
====================
* {PATCH 0/2} tests/acceptance: Add test of NeXTcube framebuffer using OCR
Message-Id: <20190629150056.9071-1-f4bug(a)amsat.org>
* {Qemu-devel} {PATCH 0/4} Introduce the microvm machine type
Message-Id: <20190628115349.60293-1-slp(a)redhat.com>
* {PATCH 0/3} tests/acceptance: Add tests for the Leon3 board
Message-Id: <20190627115331.2373-1-f4bug(a)amsat.org>
* {PATCH 0/5} tests/acceptance: Add bFLT loader linux-user test
Message-Id: <20190625101524.13447-1-philmd(a)redhat.com>
* {PATCH v2 0/9} KVM: arm/arm64: vgic: ITS translation cache
Message-Id: <20190611170336.121706-1-marc.zyngier(a)arm.com>
* {Qemu-devel} {RFC PATCH 0/7} Proof of concept for Meson integration
Message-Id: <1560165301-39026-1-git-send-email-pbonzini(a)redhat.com>
--
Alex Bennée
Progress:
* VIRT-65 [QEMU upstream maintainership]
+ QEMU 4.1 rc0 sent out of the door
+ investigated and sent fix for a regression with arm926 and arm1020
emulation: we accidentally turned off VFP double-precision support
on these cores with the recent VFP refactoring
+ helped track down a booting failure Beata ran into on aarch64 hosts
to a regression in the TCG backend, which RTH has now sent a patch for
+ sent a cleanup for some dead code spotted by Coverity in the imx6ul SoC
thanks
-- PMM
== Progress ==
* Investigate running benchmarks in containers [TCWG-1513]
- Faffing about with our benchmarking scripts, not sure how to test
changes without disrupting our infrastructure
- Cooked up some viz scripts so I can easily look at the noise
levels in benchmark results with/without containers
* Started LLVM 8.0.1 rc4 build
- In progress on ARM, infrastructure issues on AArch64
== Plan ==
* Upcoming vacation: 6 - 13 August
[LLVM-583] LLVM Code Size reduction ideas from Zephyr and CMSIS
- Started a ticket to record areas of improvement where GCC does
better than LLVM.
- Upstream defaults to -mno-unaligned-access for clang which needs to
be corrected for.
- Much of the difference goes away when inlining is disabled, implying
that different inlining strategies could be most significant
difference.
- Sent in Linaro Connect presentation submission to cover all of TCWGs
code-size improvement work.
Planned absences
- Rest of this week, back in the office on the 15th July
[Code size investigation]
Results (clang 2% larger than gcc) replicated on cortex-m0 and
cortex-m4 on Zephyr.
- Clang optimisation to use BLX rather than BL when same function
called multiple times is a pessimisation on Zephyr, especially on M0.
- GCC register allocation seems to result in fewer spills
TODO: Get an estimate of how much code-size difference is down to
different inlining decisions.
On CMSIS DSP cortex-m4f clang appears to be producing smaller than
GCC, not measured averages yet.
[LLD]
- Quite a few upstream reviews, PRs and investigations surrounding them.
- Likely that LLD will be converting to the new variable naming convention.
- Received a request to add cortex-a8 erratum fix for Google Android team.
[Linaro Connect]
Registered and contacted travel.
Drafted a submission for presentation, will submit next week.
Planned Absences:
On holiday Wednesday, Thursday, Friday next week
Progress:
* VIRT-65 [QEMU upstream maintainership]
+ catching up with email and code review -- managed to get some
series reviewed in time for softfreeze on Tuesday, notably the
'sbsa-ref' reference platform model that Hongbo Zhang was working on
+ a lot of release-herding, working through the huge pile of pull
requests that need merging
+ fixed a silly bug in recent VFP refactoring, spotted by coverity
+ fixed a memory leak that broke our CI sanitizer build (not a new
piece of code, but we currently only sanitize the x86-64 targets
and a recent change meant this old code is now used on x86-64 for
the ATI PCI display device model)
* Misc:
+ first KVM Forum Programme Committee meeting (and attendant
review of all the submitted abstracts; bumper crop this year)
thanks
-- PMM
== Progress ==
* GCC:
- FDPIC: No progress, still waiting for feedback
- noinit attribute: reviewers asked to make it a generic attribute,
rather than target-specific. New patch sent.
* GNU-583 (Fix Linux kernel built for Thumb-2 with GCC using LTO)
- no progress this week
* GCC upstream validation:
- reported a few regressions.
* Binutils:
- PR24709 (linker crash and assertion failure with CMSE). Use case not
considered worth the headache of supporting correctly CSME+long-branch
stubs (tricky to get right). Replaced the linker crash with a user
error message.
- Non-contiguous memory regions support in the BFD linker: Received a
good summary of the consensus reached in 2017.
* misc:
- infra fixes / troubleshooting
== Next ==
GCC:
- handle feedback on FDPIC and noinit patches
- binutils/linker support for non-contiguous memory regions
- GNU-583
- GCC upstream validation: Add a config for cortex-m33 (v8-m)
== Holidays ==
July 13-27
Aug 2-11
== This Week ==
* PR88833
- Fixed pending issues with x86 and committed fix to trunk
* PR90723
- Issue seems to be infinite recursion overflowing the stack, investigating.
* Misc
- Meetings
== Next Week ==
- PR90723
- Add testsuite comparison to tcwg_gnu
== Progress ==
* LLVM SPEC2k6 Performance Analysis [LLVM-134]
- Still working around perf version mismatches, going to investigate
if we can use a newer version of perf to collect data
- Had a look at the assembly for sphinx from gcc-6, clang-3.9.1 and
clang-8.0.0, but going to wait for better perf before I rush to
conclusions
* IR SVE Reviews [ LLVM-545]
- Had a look at the clang patches, gave some feedback for one of
them; the other ones are very subtle and best left to the clang
maintainers
* [GlobalISel] Refactor CallLowering [LLVM-568]
- Fixed a little ASAN snag, should be done for good now
* Trying to get up an ABI fuzzer for GlobalISel
== Plan ==
* Update benchmarking infrastructure (in support of LLVM-134)
* Deprioritize GlobalISel
* Upcoming vacation: 6 - 13 August
