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perf tools: Fix synthesizing fork_event.ppid for non-main thread
Commit ca6c41c59b
sets the ppid based on what is read from the
/proc/pid/status file when synthesizing fork events.
This is correct thing to do for new processes but not threads of a
process.
Fix ppid for threads to be the main thread when synthesizing fork events
(ie., assume main thread spawned all sub-threads in a process).
Reported-by: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
Signed-off-by: David Ahern <david.ahern@oracle.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Don Zickus <dzickus@redhat.com>
Link: http://lkml.kernel.org/r/1428598107-178999-1-git-send-email-david.ahern@oracle.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
parent
51ab7155c0
commit
7764a385f6
1 changed files with 12 additions and 2 deletions
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@ -183,8 +183,18 @@ static int perf_event__synthesize_fork(struct perf_tool *tool,
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{
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memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
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event->fork.ppid = ppid;
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event->fork.ptid = ppid;
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/*
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* for main thread set parent to ppid from status file. For other
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* threads set parent pid to main thread. ie., assume main thread
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* spawns all threads in a process
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*/
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if (tgid == pid) {
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event->fork.ppid = ppid;
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event->fork.ptid = ppid;
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} else {
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event->fork.ppid = tgid;
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event->fork.ptid = tgid;
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}
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event->fork.pid = tgid;
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event->fork.tid = pid;
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event->fork.header.type = PERF_RECORD_FORK;
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