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block: extend bio caching to task context

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bio_put_percpu_cache() puts all non-iopoll bios into the irq-safe list,
which entails disabling irqs. The overhead of that is not that bad when
interrupts are already off but getting worse otherwise. We can optimise
it when we're in the task context by using ->free_list directly just as
the IOPOLL path does.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/4774e1a0f905f96c63174b0f3e4f79f0d9b63246.1707314970.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2024-02-07 14:14:28 +00:00 committed by Jens Axboe
parent 79ae56fc47
commit c9f5f3aa19
1 changed files with 2 additions and 1 deletions
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3
block/bio.c
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@ -770,8 +770,9 @@ static inline void bio_put_percpu_cache(struct bio *bio)
bio_uninit(bio);
if ((bio->bi_opf & REQ_POLLED) && !WARN_ON_ONCE(in_interrupt())) {
if (in_task()) {
bio->bi_next = cache->free_list;
/* Not necessary but helps not to iopoll already freed bios */
bio->bi_bdev = NULL;
cache->free_list = bio;
cache->nr++;