Commit 12c5b70c authored by Jens Axboe's avatar Jens Axboe
Browse files

block: enable per-cpu bio caching for the fs bio set 



This is useful for polled IO on a file, or for polled IO with the
io_uring passthrough mechanism. If bio allocations are done with
REQ_POLLED for those cases, then initializing the bio set with
BIOSET_PERCPU_CACHE enables the local per-cpu cache which eliminates
allocations (and frees) of bio structs when possible.

Reviewed-by: default avatarKanchan Joshi <joshi.k@samsung.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 16ede669

block/bio.c

+2 −1
Original line number Diff line number Diff line
@@ -1754,7 +1754,8 @@ static int __init init_bio(void) 
	cpuhp_setup_state_multi(CPUHP_BIO_DEAD, "block/bio:dead", NULL,

					bio_cpu_dead);



	if (bioset_init(&fs_bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS))

	if (bioset_init(&fs_bio_set, BIO_POOL_SIZE, 0,

			BIOSET_NEED_BVECS | BIOSET_PERCPU_CACHE))

		panic("bio: can't allocate bios\n");



	if (bioset_integrity_create(&fs_bio_set, BIO_POOL_SIZE))