perf: Tweak perf_event_attr::exclusive semantics

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Currently perf_event_attr::exclusive can be used to ensure an
event(group) is the sole group scheduled on the PMU. One consequence
is that when you have a pinned event (say the watchdog) you can no
longer have regular exclusive event(group)s.

Inspired by the fact that !pinned events are considered less strict,
allow !pinned,exclusive events to share the PMU with pinned,!exclusive
events.

Pinned,exclusive is still fully exclusive.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20201029162902.105962225@infradead.org

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Peter Zijlstra 2020-10-29 16:32:22 +01:00

parent 2714c3962f

commit 1908dc9117

1 changed files with 1 additions and 1 deletions

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kernel/events/core.c

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