Messages in this thread Patch in this message | | | From | Ming Lei <> | Subject | [PATCH 4/4] md: fast clone bio in bio_clone_mddev() | Date | Sun, 5 Feb 2017 14:22:13 +0800 |
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Firstly bio_clone_mddev() is used in raid normal I/O and isn't in resync I/O path.
Secondly all the direct access to bvec table in raid happens on resync I/O except for write behind of raid1, in which we still use bio_clone() for allocating new bvec table.
So this patch replaces bio_clone() with bio_clone_fast() in bio_clone_mddev().
Signed-off-by: Ming Lei <tom.leiming@gmail.com> --- drivers/md/md.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c index 704be11355a9..7d176f025add 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -193,10 +193,14 @@ EXPORT_SYMBOL_GPL(bio_alloc_mddev); struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, struct mddev *mddev) { + struct bio_set *bs; + if (!mddev || !mddev->bio_set) - return bio_clone(bio, gfp_mask); + bs = fs_bio_set; + else + bs = mddev->bio_set; - return bio_clone_bioset(bio, gfp_mask, mddev->bio_set); + return bio_clone_fast(bio, gfp_mask, bs); } EXPORT_SYMBOL_GPL(bio_clone_mddev); -- 2.7.4
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