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| author | Junichi Nomura <j-nomura@ce.jp.nec.com> | 2014-10-03 17:27:11 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-10-03 15:28:16 -0600 |
| commit | 11dfce509eaa35e8fc81cb50d0910c0e235fd7e2 (patch) | |
| tree | ad67b4e5266cf3cd9efdc12e3929f9c95f0b82ff /block | |
| parent | 4a0efdc933680d908de11712a774a2c9492c3d5a (diff) | |
| download | linux-11dfce509eaa35e8fc81cb50d0910c0e235fd7e2.tar.gz linux-11dfce509eaa35e8fc81cb50d0910c0e235fd7e2.tar.bz2 linux-11dfce509eaa35e8fc81cb50d0910c0e235fd7e2.zip | |
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 <j-nomura@ce.jp.nec.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-core.c | 2 |
1 files changed, 1 insertions, 1 deletions
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; |