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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2011-04-09 21:17:47 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-05-28 18:01:21 +0200 |
| commit | e03a9a55b4e45377af9ca3d464135f9ea280b8f8 (patch) | |
| tree | 81ccb92c25baf8c1ac3d181fe25607328c1eb7f1 /Documentation/sgi-ioc4.txt | |
| parent | dce5855bba5df9e87bb04584d505c1f1b103c652 (diff) | |
perf: Change close() semantics for group events
In order to always call list_del_event() on the correct cpu if the
event is part of an active context and avoid having to do two IPIs,
change the close() semantics slightly.
The current perf_event_disable() call would disable a whole group if
the event that's being closed is the group leader, whereas the new
code keeps the group siblings enabled.
People should not rely on this behaviour and I don't think they do,
but in case we find they do, the fix is easy and we have to take the
double IPI cost.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Vince Weaver <vweaver1@eecs.utk.edu>
Link: http://lkml.kernel.org/r/20110409192142.038377551@chello.nl
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation/sgi-ioc4.txt')
0 files changed, 0 insertions, 0 deletions