Commit 1a7e76e4 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

block: use SLAB_TYPESAFE_BY_RCU for the bio slab 



This flags ensures that the pages will not be reused for non-bio
allocations before the end of an RCU grace period.  With that we can
safely use a RCU lookup for bio polling as long as we are fine with
occasionally polling the wrong device.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Tested-by: default avatarMark Wunderlich <mark.wunderlich@intel.com>
Link: https://lore.kernel.org/r/20211012111226.760968-13-hch@lst.de


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 6ce913fe

block/bio.c

+2 −1
Original line number Diff line number Diff line
@@ -87,7 +87,8 @@ static struct bio_slab *create_bio_slab(unsigned int size) 


	snprintf(bslab->name, sizeof(bslab->name), "bio-%d", size);

	bslab->slab = kmem_cache_create(bslab->name, size,

			ARCH_KMALLOC_MINALIGN, SLAB_HWCACHE_ALIGN, NULL);

			ARCH_KMALLOC_MINALIGN,

			SLAB_HWCACHE_ALIGN | SLAB_TYPESAFE_BY_RCU, NULL);

	if (!bslab->slab)

		goto fail_alloc_slab;