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perf top: Decay periods in callchains

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It missed to decay periods in callchains when decaying hist entries.
This resulted in more than 100 percent overhead in callchains in the
fractal style output.

Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1451963160-17196-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim
2016-01-05 12:06:00 +09:00
committed by Arnaldo Carvalho de Melo
parent 915b0882c3
commit 42b276a235
3 changed files with 30 additions and 0 deletions
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tools/perf/util/hist.c
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@@ -254,6 +254,7 @@ static bool hists__decay_entry(struct hists *hists, struct hist_entry *he)
he_stat__decay(&he->stat);
if (symbol_conf.cumulate_callchain)
he_stat__decay(he->stat_acc);
decay_callchain(he->callchain);
diff = prev_period - he->stat.period;