On Tue, Nov 18, 2025 at 1:13 PM Ian Rogers <irogers@google.com> wrote:
>
> The remnants of:
> https://lore.kernel.org/lkml/20251113180517.44096-1-irogers@google.com/
>
> Read tool events last so that counts shouldn't exceed theoretic
> maximums.
>
> Change how affinities work with evlist__for_each_cpu. Move the
> affinity code into the iterator to simplify setting it up. Detect when
> affinities will and won't be profitable, for example a tool event and
> a regular perf event (or read group) may face less delay from a single
> IPI for the event read than from a call to sched_setaffinity. Add a
> --no-affinity flag to perf stat to allow affinities to be disabled.
Ping.
Thanks,
Ian
> v5: Drop merged changes. Move tool event reading to first
> patch. Change --no-affinity flag to --affinity/--no-affinity flag.
>
> v4: Rebase. Add patch to reduce scope of walltime_nsec_stats now that
> the legacy metric code is no more. Minor tweak to the ru_stats
> clean up.
> https://lore.kernel.org/lkml/20251113180517.44096-1-irogers@google.com/
>
> v3: Add affinity clean ups and read tool events last.
> https://lore.kernel.org/lkml/20251106071241.141234-1-irogers@google.com/
>
> v2: Fixed an aggregation index issue:
> https://lore.kernel.org/lkml/20251104234148.3103176-2-irogers@google.com/
>
> v1:
> https://lore.kernel.org/lkml/20251104053449.1208800-1-irogers@google.com/
>
> Ian Rogers (3):
> perf stat: Read tool events last
> perf evlist: Reduce affinity use and move into iterator, fix no
> affinity
> perf stat: Add no-affinity flag
>
> tools/perf/Documentation/perf-stat.txt | 4 +
> tools/perf/builtin-stat.c | 159 ++++++++++++++-----------
> tools/perf/util/evlist.c | 156 ++++++++++++++----------
> tools/perf/util/evlist.h | 27 +++--
> tools/perf/util/pmu.c | 12 ++
> tools/perf/util/pmu.h | 1 +
> 6 files changed, 222 insertions(+), 137 deletions(-)
>
> --
> 2.52.0.rc1.455.g30608eb744-goog
>