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>
parent
4a0efdc9
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