[ACTIVITY] report week ending 6 Jul

[Peter Maydell]

Progress:
* VIRT-65 [QEMU upstream maintainership]
+ softfreeze-related maintenance work
+ investigating reported bug with CMSDK timer device model:
couldn't reproduce hangs, but sent patches which fix
various issues
+ code review:
- various patches by the Outreachy/GSoC interns for
the v6M/microbit work
- a few OSX UI bugfix patches
+ scrub through some recently filed bugs to see what might be
worth investigating before the release
+ first pass through KVM Forum talk submissions

thanks
-- PMM

[Peter Smith]

[TCWG-1368] Tracked down libfuzzer buildbot failures on aarch64 and raised PR
[TCWG-1424] Use profile information for size optimisation
- Decided to use clang's 2-stage PGO build as next experiment with
compile times on the full test suite as the performance benchmarks
- Spent rather too much time trying to inject an extra c-flag into the
right stage of the bootstrap builds. As a consolation I know a little
bit more about the bootstrap builds.
- Just measuring code size the profile guided feedback builds of clang
are roughly 33% larger than standard clang, with cold functions
optimised for size this drops to 25% larger. Still waiting for
performance figures for all runs. It is looking like in its current
formulation the size optimisation might offer most of the benefits of
PGO but with a lower code size impact. It misses the original goal of
keeping the performance of non-PGO optimisation but lower overall
size.
[Misc] Tracked down a LLD static build failure with a recent glibc.
Looks like it won't affect Arm and AArch64 as it is related to X86
relaxed got relocations to ifunc resolvers.

Planned absences
- Holiday Monday 9th July