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(parent: 749443d) | patch
mm/percpu: micro-optimize pcpu_is_populated()
authorYury Norov <yury.norov@gmail.com>
Sat, 14 Aug 2021 21:17:10 +0000 (14:17 -0700)
committerYury Norov <yury.norov@gmail.com>
Sat, 15 Jan 2022 16:47:31 +0000 (08:47 -0800)
commit801a57365fc836d7ec866e2069d0b21d79925c1e
tree76af2ac9496f91c85eb00a66be42235c82a1bbc6tree | snapshot
parent749443de8dde3b8b420ee8b4daac4d929a6adeb9commit | diff
mm/percpu: micro-optimize pcpu_is_populated()

bitmap_next_clear_region() calls find_next_zero_bit() and find_next_bit()
sequentially to find a range of clear bits. In case of pcpu_is_populated()
there's a chance to return earlier if bitmap has all bits set.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Dennis Zhou <dennis@kernel.org>
mm/percpu.c diff | blob | blame | history
Linux 6.x block layer and io_uring tree(s)