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[v2,2/4] block: use bio_clone_fast() in blk_rq_prep_clone()

Message ID 1412371633-30356-2-git-send-email-snitzer@redhat.com (mailing list archive)
State Accepted, archived
Delegated to: Mike Snitzer
Headers show

Commit Message

Mike Snitzer Oct. 3, 2014, 9:27 p.m. UTC 
From: Junichi Nomura <j-nomura@ce.jp.nec.com>

Request cloning clones bios in the request to track the completion
of each bio.
For that purpose, we can use bio_clone_fast() instead of bio_clone()
to avoid unnecessary allocation and copy of bvecs.

This patch reduces memory footprint of request-based device-mapper
(about 1-4KB for each request) and is a preparation for further
reduction of memory usage by removing unused bvec mempool.

Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
 block/blk-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox

Patch

diff --git a/block/blk-core.c b/block/blk-core.c
index bf930f4..a92f720 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2931,7 +2931,7 @@  int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
 	blk_rq_init(NULL, rq);
 
 	__rq_for_each_bio(bio_src, rq_src) {
-		bio = bio_clone_bioset(bio_src, gfp_mask, bs);
+		bio = bio_clone_fast(bio_src, gfp_mask, bs);
 		if (!bio)
 			goto free_and_out;