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perf_counter: Log vfork as a fork event

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Right now we don't output vfork events. Even though we should
always see an exec after a vfork, we may get perfcounter
samples between the vfork and exec. These samples can lead to
some confusion when parsing perfcounter data.

To keep things consistent we should always log a fork event. It
will result in a little more log data, but is less confusing to
trace parsing tools.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20090716104817.589309391@samba.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Anton Blanchard 2009-07-16 15:44:29 +02:00 • committed by Ingo Molnar
parent 11b5f81e1b
commit ed900c054b
1 changed files with 3 additions and 6 deletions
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9
kernel/fork.c
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@ -1408,14 +1408,11 @@ long do_fork(unsigned long clone_flags,
if (clone_flags & CLONE_VFORK) { if (clone_flags & CLONE_VFORK) {
p->vfork_done = &vfork; p->vfork_done = &vfork;
init_completion(&vfork); init_completion(&vfork);
} else if (!(clone_flags & CLONE_VM)) {
/*
* vfork will do an exec which will call
* set_task_comm()
*/
perf_counter_fork(p);
} }
if (!(clone_flags & CLONE_THREAD))
perf_counter_fork(p);
audit_finish_fork(p); audit_finish_fork(p);
tracehook_report_clone(regs, clone_flags, nr, p); tracehook_report_clone(regs, clone_flags, nr, p);