Commit 0014de17 authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo

perf sched latency: Fix thread pid reuse issue

The latency subcommand holds a tree of working atoms sorted by thread's
pid/tid. If there's new thread with same pid and tid, the old working atom is
found and assert bug condition is hit in search function:

  thread_atoms_search: Assertion `!(thread != atoms->thread)' failed

Changing the sort function to use thread object pointers together with pid and
tid check. This way new thread will never find old one with same pid/tid.

Link: http://lkml.kernel.org/n/tip-o4doazhhv0zax5zshkg8hnys@git.kernel.orgReported-by: default avatarMohit Agrawal <moagrawa@redhat.com>
Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Acked-by: default avatarNamhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1446462625-15807-1-git-send-email-jolsa@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 98d3b258
......@@ -1203,12 +1203,13 @@ static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_
static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
{
if (l->thread == r->thread)
return 0;
if (l->thread->tid < r->thread->tid)
return -1;
if (l->thread->tid > r->thread->tid)
return 1;
return 0;
return (int)(l->thread - r->thread);
}
static int avg_cmp(struct work_atoms *l, struct work_atoms *r)
......
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