Commit 68614289 authored Feb 15, 2019 by Ming Lei Committed by Jens Axboe Feb 15, 2019

block: always define BIO_MAX_PAGES as 256



Now multi-page bvec can cover CONFIG_THP_SWAP, so we don't need to
increase BIO_MAX_PAGES for it.

CONFIG_THP_SWAP needs to split one THP into normal pages and adds
them all to one bio. With multipage-bvec, it just takes one bvec to
hold them all.

Reviewed-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent 07173c3e

include/linux/bio.h

+0 −8

Original line number	Diff line number	Diff line
		@@ -34,15 +34,7 @@
		#define BIO_BUG_ON
		#endif

		#ifdef CONFIG_THP_SWAP
		#if HPAGE_PMD_NR > 256
		#define BIO_MAX_PAGES HPAGE_PMD_NR
		#else
		#define BIO_MAX_PAGES 256
		#endif
		#else
		#define BIO_MAX_PAGES 256
		#endif

		#define bio_prio(bio) (bio)->bi_ioprio
		#define bio_set_prio(bio, prio) ((bio)->bi_ioprio = prio)

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