Revision - 8b464ea - perf evlist: Avoid iteration for empty evlist. - origin: https://github.com/torvalds/linux

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https://github.com/torvalds/linux

17 May 2024, 11:00:25 UTC

Revision 8b464eac9765dfc84d0327fa3f3668faa439d1ce authored by Ian Rogers on 17 March 2022, 23:16:43 UTC, committed by Arnaldo Carvalho de Melo on 18 March 2022, 21:39:09 UTC

perf evlist: Avoid iteration for empty evlist.

As seen with 'perf stat --null ..' and reported in:
https://lore.kernel.org/lkml/YjCLcpcX2peeQVCH@kernel.org/

v2. Avoids setting evsel in the empty list case as suggested by Jiri Olsa.

    Committer testing:

Before:

  $  perf stat --null sleep 1
  Segmentation fault (core dumped)
  $

After:

  $  perf stat --null sleep 1

   Performance counter stats for 'sleep 1':

         1.010340646 seconds time elapsed

         0.001420000 seconds user
         0.000000000 seconds sys
  $

Fixes: 472832d2c000b961 ("perf evlist: Refactor evlist__for_each_cpu()")
Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20220317231643.550902-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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Tip revision: 8b464eac9765dfc84d0327fa3f3668faa439d1ce authored by Ian Rogers on 17 March 2022, 23:16:43 UTC
perf evlist: Avoid iteration for empty evlist.

Tip revision: 8b464ea

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perf evlist: Avoid iteration for empty evlist.

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