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SubjectRe: [PATCH v1 0/5] md: use bio_clone_fast()
On Fri, Feb 10, 2017 at 06:56:12PM +0800, Ming Lei wrote:
> Hi,
>
> This patches replaces bio_clone() with bio_fast_clone() in
> bio_clone_mddev() because:
>
> 1) bio_clone_mddev() is used in raid normal I/O and isn't in
> resync I/O path, and all the direct access to bvec table in
> raid happens on resync I/O only except for write behind of raid1.
> Write behind is treated specially, so the replacement is safe.
>
> 2) for write behind, bio_clone() is kept, but this patchset
> introduces bio_clone_bioset_partial() to just clone one specific
> bvecs range instead of whole table. Then write behind is improved
> too.

Thanks! this patch set looks good to me.
Jens,
can you look at the first patch? If it's ok, I'll carry it in my tree.

Thanks,
Shaohua

> V1:
> 1) don't introduce bio_clone_slow_mddev_partial()
> 2) return failure if mddev->bio_set can't be created
> 3) remove check in bio_clone_mddev() as suggested by
> Christoph Hellwig.
> 4) rename bio_clone_mddev() as bio_clone_fast_mddev()
>
>
> Ming Lei (5):
> block: introduce bio_clone_bioset_partial()
> md/raid1: use bio_clone_bioset_partial() in case of write behind
> md: fail if mddev->bio_set can't be created
> md: remove unnecessary check on mddev
> md: fast clone bio in bio_clone_mddev()
>
> block/bio.c | 61 +++++++++++++++++++++++++++++++++++++++++------------
> drivers/md/faulty.c | 2 +-
> drivers/md/md.c | 14 ++++++------
> drivers/md/md.h | 4 ++--
> drivers/md/raid1.c | 26 ++++++++++++++++-------
> drivers/md/raid10.c | 11 +++++-----
> drivers/md/raid5.c | 4 ++--
> include/linux/bio.h | 11 ++++++++--
> 8 files changed, 92 insertions(+), 41 deletions(-)
>
> --
> 2.7.4
>
> Thanks,
> Ming

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