Peter Zijlstra 8882135bcd
perf: Fix owner-list vs exit ...
Oleg noticed that a perf-fd keeping a reference on the creating task
leads to a few funny side effects.
There's two different aspects to this:
- kernel based perf-events, these should not take out
a reference on the creating task and appear on the task's
event list since they're not bound to fds nor visible
to userspace.
- fork() and pthread_create(), these can lead to the creating
task dying (and thus the task's event-list becomming useless)
but keeping the list and ref alive until the event is closed.
Combined they lead to malfunction of the ptrace hw_tracepoints.
Cure this by not considering kernel based perf_events for the
owner-list and destroying the owner-list when the owner dies.
Reported-by: Oleg Nesterov <oleg@redhat.com >
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl >
Acked-by: Oleg Nesterov <oleg@redhat.com >
LKML-Reference: <1289576883.2084.286.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu >
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