seqlock: add raw_seqcount_try_begin

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Add raw_seqcount_try_begin() to opens a read critical section of the given
seqcount_t if the counter is even. This enables eliding the critical
section entirely if the counter is odd, instead of doing the speculation
knowing it will fail.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Link: https://lkml.kernel.org/r/20241122174416.1367052-1-surenb@google.com

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Suren Baghdasaryan 2024-11-22 09:44:14 -08:00 • committed by Peter Zijlstra

parent b4943b8bfc

commit 96450ead16

1 changed files with 22 additions and 0 deletions

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include/linux/seqlock.h

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