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perf diff: Support --cpu filter option

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To improve 'perf diff', implement a --cpu filter option.

Multiple CPUs can be provided as a comma-separated list with no space:
0,1.  Ranges of CPUs are specified with -: 0-2. Default is to report
samples on all CPUs.

For example,

  perf diff --cpu 0,1

It only diff the samples for CPU0 and CPU1.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1551791143-10334-3-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jin Yao
2019-03-05 21:05:42 +08:00
committed by Arnaldo Carvalho de Melo
parent 4802138d78
commit daca23b200
2 changed files with 21 additions and 0 deletions
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5
tools/perf/Documentation/perf-diff.txt
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@@ -163,6 +163,11 @@ OPTIONS
the end of perf.data.old and analyzes the perf.data from the
timestamp 3971.150589 to the end of perf.data.
--cpu:: Only diff samples for the list of CPUs provided. Multiple CPUs can
be provided as a comma-separated list with no space: 0,1. Ranges of
CPUs are specified with -: 0-2. Default is to report samples on all
CPUs.
COMPARISON
----------
The comparison is governed by the baseline file. The baseline perf.data