perf/core: Remove retry loop from perf_mmap()

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AFAICT there is no actual benefit from the mutex drop on re-try. The
'worst' case scenario is that we instantly re-gain the mutex without
perf_mmap_close() getting it. So might as well make that the normal
case.

Reflow the code to make the ring buffer detach case naturally flow
into the no ring buffer case.

[ mingo: Forward ported it ]

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Ravi Bangoria <ravi.bangoria@amd.com>
Link: https://lore.kernel.org/r/20241104135519.463607258@infradead.org

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Peter Zijlstra 2024-11-04 14:39:26 +01:00 • committed by Ingo Molnar

parent 0c8a4e4139

commit 8eaec7bb72

1 changed files with 15 additions and 10 deletions

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kernel/events/core.c

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