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perf tools: Increase MAX_NR_CPUS and MAX_CACHES
authorKyle Meyer <kyle.meyer@hpe.com>
Thu, 20 Jun 2019 19:36:30 +0000 (14:36 -0500)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Tue, 25 Jun 2019 11:47:10 +0000 (08:47 -0300)
commit9f94c7f947e919c343b30f080285af53d0fa9902
treecbb287ac88989ea41cc33f6d0bb12d4f5a929cb2
parenteb5d854456f5a4ccec6f9681b7196cf056df8cfa
perf tools: Increase MAX_NR_CPUS and MAX_CACHES

Attempting to profile 1024 or more CPUs with perf causes two errors:

  perf record -a
  [ perf record: Woken up X times to write data ]
  way too many cpu caches..
  [ perf record: Captured and wrote X MB perf.data (X samples) ]

  perf report -C 1024
  Error: failed to set  cpu bitmap
  Requested CPU 1024 too large. Consider raising MAX_NR_CPUS

  Increasing MAX_NR_CPUS from 1024 to 2048 and redefining MAX_CACHES as
  MAX_NR_CPUS * 4 returns normal functionality to perf:

  perf record -a
  [ perf record: Woken up X times to write data ]
  [ perf record: Captured and wrote X MB perf.data (X samples) ]

  perf report -C 1024
  ...

Signed-off-by: Kyle Meyer <kyle.meyer@hpe.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190620193630.154025-1-meyerk@stormcage.eag.rdlabs.hpecorp.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/perf/perf.h
tools/perf/util/header.c