From 11dfce509eaa35e8fc81cb50d0910c0e235fd7e2 Mon Sep 17 00:00:00 2001 From: Junichi Nomura Date: Fri, 3 Oct 2014 17:27:11 -0400 Subject: [PATCH] block: use bio_clone_fast() in blk_rq_prep_clone() 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 Signed-off-by: Mike Snitzer Signed-off-by: Jens Axboe --- block/blk-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/blk-core.c b/block/blk-core.c index 4aa9ccd02a50..ffcb47af35f3 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -2926,7 +2926,7 @@ 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; -- 2.20.1