linux-kernel - [PATCH v3 0/6] perf: Replace MAX_NR

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Message-Id: <20190819202241.87799-1-meyerk@stormcage.eag.rdlabs.hpecorp.net>
Date:   Mon, 19 Aug 2019 15:22:41 -0500
From:   Kyle Meyer <meyerk@....com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Kyle Meyer <meyerk@....com>, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org,
        Russ Anderson <russ.anderson@....com>,
        Kyle Meyer <kyle.meyer@....com>
Subject: [PATCH v3 0/6] perf: Replace MAX_NR_CPUS with dynamic alternatives 

The purpose of this patch series is to replace MAX_NR_CPUS with a dynamic value
throughout perf wherever possible using nr_cpus_online, the number of CPUs
online during a record session, and cpu__max_cpu, the possible number of CPUs as
defined in the sysfs. MAX_NR_CPUS is still used by DECLARE_BITMAP at compile
time, however, it's replaced elsewhere.

This patch series was tested using "perf record -a -g" on both an eight socket
(288 CPU) system and a single socket (36 CPU) system. Each system was then
rebooted single socket and eight socket before "perf report" was used to read
the perf.data out file. "perf report --header" was used to confirm that each
perf.data file had information on the correct number of CPUs.

Change since v1:
  Broke PATCH 2/2 into multiple patches.

Changes since v2:
  Replaced env->sibling_cores and env->sibling threads with a local pointer and
  refreshed perf/util/svghelper.

  Kyle Meyer (6):
    perf: Refactor svg_build_topology_map
    perf/util/svghelper: Replace MAX_NR_CPUS with env->nr_cpus_online
    perf/util/stat: Replace MAX_NR_CPUS with cpu__max_cpu
    perf/util/session: Replace MAX_NR_CPUS with nr_cpus_online
    perf/util/machine: Replace MAX_NR_CPUS with nr_cpus_online
    perf/util/header: Replace MAX_NR_CPUS with cpu__max_cpu

 tools/perf/builtin-timechart.c |  5 +----
 tools/perf/util/header.c       |  7 +++---
 tools/perf/util/machine.c      | 12 ++++++-----
 tools/perf/util/session.c      |  6 +++---
 tools/perf/util/stat.c         |  4 ++--
 tools/perf/util/svghelper.c    | 48 +++++++++++++++++++++---------------------
 tools/perf/util/svghelper.h    |  4 +++-
 7 files changed, 44 insertions(+), 42 deletions(-)

Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: linux-kernel@...r.kernel.org
Cc: Russ Anderson <russ.anderson@....com>
Signed-off-by: Kyle Meyer <kyle.meyer@....com>
-- 
2.12.3