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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-05-27 09:47:49 -0400
committerIngo Molnar <mingo@elte.hu>2010-05-31 02:46:09 -0400
commit8a49542c0554af7d0073aac0ee73ee65b807ef34 (patch)
tree73e82ee5a624012ac723c3af21bb1945b7bd675f /kernel/sched.c
parentac9721f3f54b27a16c7e1afb2481e7ee95a70318 (diff)
perf_events: Fix races in group composition
Group siblings don't pin each-other or the parent, so when we destroy events we must make sure to clean up all cross referencing pointers. In particular, for destruction of a group leader we must be able to find all its siblings and remove their reference to it. This means that detaching an event from its context must not detach it from the group, otherwise we can end up failing to clear all pointers. Solve this by clearly separating the attachment to a context and attachment to a group, and keep the group composed until we destroy the events. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
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