perf top: Access hists->lock only if needed

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The perf_top__record_precise_ip() releases and regrabs the
he->hists->lock because it can sleep if there's an error.  But it should
be done conditionally as it slows down the fast path.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1449802616-16170-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

...

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Namhyung Kim 2015-12-11 11:56:54 +09:00 • committed by Arnaldo Carvalho de Melo

parent 64226bcf64

commit 151ee834cc

1 changed files with 15 additions and 13 deletions

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tools/perf/builtin-top.c

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