linux-kernel - [PATCH v5 0/3] perf stat affinity changes

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Message-ID: <20251118211326.1840989-1-irogers@google.com>
Date: Tue, 18 Nov 2025 13:13:23 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	"Dr. David Alan Gilbert" <linux@...blig.org>, Yang Li <yang.lee@...ux.alibaba.com>, 
	James Clark <james.clark@...aro.org>, Thomas Falcon <thomas.falcon@...el.com>, 
	Thomas Richter <tmricht@...ux.ibm.com>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>, 
	Dapeng Mi <dapeng1.mi@...ux.intel.com>
Subject: [PATCH v5 0/3] perf stat affinity changes

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.

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