linux-kernel - [PATCH v1 0/8] Cpumap improvements for large MAX_NR

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Message-Id: <20241206044035.1062032-1-irogers@google.com>
Date: Thu,  5 Dec 2024 20:40:27 -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>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>, 
	Kyle Meyer <kyle.meyer@....com>, Ben Gainey <ben.gainey@....com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 0/8] Cpumap improvements for large MAX_NR_CPUS

Prompted by Kyle Meyer's <kyle.meyer@....com> report of the
MAX_NR_CPUS value being too small, initiate some clean up of its
use. Kyle's patch is at the head of the series. The additional patches
hide MAX_NR_CPUS as exposed from cpumap.h, reduce its use by removing
perf_cpu_map__read, and try to better size the temporary CPU array in
perf_cpu_map__new.

Ian Rogers (7):
  perf cpumap: Reduce transitive dependencies on libperf MAX_NR_CPUS
  libperf cpumap: Hide/reduce scope of MAX_NR_CPUS
  libperf cpumap: Be tolerant of newline at the end of a cpumask
  perf pmu: Remove use of perf_cpu_map__read
  libperf cpumap: Remove use of perf_cpu_map__read
  libperf cpumap: Remove perf_cpu_map__read
  libperf cpumap: Grow array of read CPUs in smaller increments

Kyle Meyer (1):
  perf: Increase MAX_NR_CPUS to 4096

 tools/lib/perf/Documentation/libperf.txt |  1 -
 tools/lib/perf/cpumap.c                  | 82 +++++-------------------
 tools/lib/perf/include/internal/cpumap.h |  4 --
 tools/lib/perf/include/perf/cpumap.h     |  2 -
 tools/lib/perf/libperf.map               |  1 -
 tools/perf/builtin-annotate.c            |  1 +
 tools/perf/builtin-diff.c                |  1 +
 tools/perf/builtin-kwork.c               |  1 +
 tools/perf/builtin-mem.c                 |  1 +
 tools/perf/builtin-sched.c               |  1 +
 tools/perf/perf.h                        |  2 +-
 tools/perf/util/bpf_skel/kwork_top.bpf.c |  4 +-
 tools/perf/util/kwork.h                  |  1 +
 tools/perf/util/pmu.c                    | 30 ++++++---
 tools/perf/util/session.c                |  1 +
 tools/perf/util/svghelper.c              |  1 +
 16 files changed, 47 insertions(+), 87 deletions(-)

-- 
2.47.0.338.g60cca15819-goog