From: Pavel Begunkov <asml.silence@gmail.com>
To: Ming Lei <ming.lei@redhat.com>, Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH V3 3/6] block: don't allocate inline bvecs if this bioset needn't bvecs
Date: Mon, 11 Jan 2021 04:41:41 +0000 [thread overview]
Message-ID: <269c3677-88c2-9e3a-45d2-438edd03a82b@gmail.com> (raw)
In-Reply-To: <20210111030557.4154161-4-ming.lei@redhat.com>
On 11/01/2021 03:05, Ming Lei wrote:
> The inline bvecs won't be used if user needn't bvecs by not passing
> BIOSET_NEED_BVECS, so don't allocate bvecs in this situation.
>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Tested-by: Pavel Begunkov <asml.silence@gmail.com>
> ---
> block/bio.c | 7 +++++--
> include/linux/bio.h | 1 +
> 2 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/block/bio.c b/block/bio.c
> index cfa0e9db30e0..496aa5938f79 100644
> --- a/block/bio.c
> +++ b/block/bio.c
> @@ -89,8 +89,7 @@ static struct bio_slab *create_bio_slab(unsigned int size)
>
> static inline unsigned int bs_bio_slab_size(struct bio_set *bs)
> {
> - return bs->front_pad + sizeof(struct bio) +
> - BIO_INLINE_VECS * sizeof(struct bio_vec);
> + return bs->front_pad + sizeof(struct bio) + bs->back_pad;
> }
>
> static struct kmem_cache *bio_find_or_create_slab(struct bio_set *bs)
> @@ -1572,6 +1571,10 @@ int bioset_init(struct bio_set *bs,
> int flags)
> {
> bs->front_pad = front_pad;
> + if (flags & BIOSET_NEED_BVECS)
> + bs->back_pad = BIO_INLINE_VECS * sizeof(struct bio_vec);
> + else
> + bs->back_pad = 0;
>
> spin_lock_init(&bs->rescue_lock);
> bio_list_init(&bs->rescue_list);
> diff --git a/include/linux/bio.h b/include/linux/bio.h
> index 1edda614f7ce..f606eb1e556f 100644
> --- a/include/linux/bio.h
> +++ b/include/linux/bio.h
> @@ -703,6 +703,7 @@ struct bio_set {
> mempool_t bvec_integrity_pool;
> #endif
>
> + unsigned int back_pad;
> /*
> * Deadlock avoidance for stacking block drivers: see comments in
> * bio_alloc_bioset() for details
>
--
Pavel Begunkov
next prev parent reply other threads:[~2021-01-11 4:45 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-11 3:05 [PATCH V3 0/6] block: improvement on bioset & bvec allocation Ming Lei
2021-01-11 3:05 ` [PATCH V3 1/6] block: manage bio slab cache by xarray Ming Lei
2021-01-11 4:39 ` Pavel Begunkov
2021-01-11 6:57 ` Hannes Reinecke
2021-01-11 3:05 ` [PATCH V3 2/6] block: don't pass BIOSET_NEED_BVECS for q->bio_split Ming Lei
2021-01-11 4:41 ` Pavel Begunkov
2021-01-11 6:57 ` Hannes Reinecke
2021-01-11 3:05 ` [PATCH V3 3/6] block: don't allocate inline bvecs if this bioset needn't bvecs Ming Lei
2021-01-11 4:41 ` Pavel Begunkov [this message]
2021-01-11 6:58 ` Hannes Reinecke
2021-01-11 3:05 ` [PATCH V3 4/6] block: set .bi_max_vecs as actual allocated vector number Ming Lei
2021-01-11 4:42 ` Pavel Begunkov
2021-01-11 6:59 ` Hannes Reinecke
2021-01-11 3:05 ` [PATCH V3 5/6] block: move three bvec helpers declaration into private helper Ming Lei
2021-01-11 4:42 ` Pavel Begunkov
2021-01-11 7:00 ` Hannes Reinecke
2021-01-11 3:05 ` [PATCH V3 6/6] bcache: don't pass BIOSET_NEED_BVECS for the 'bio_set' embedded in 'cache_set' Ming Lei
2021-01-11 3:54 ` Coly Li
2021-01-11 7:00 ` Hannes Reinecke
2021-01-11 4:35 ` [PATCH V3 0/6] block: improvement on bioset & bvec allocation Pavel Begunkov
2021-01-25 2:27 ` Ming Lei
2021-01-25 4:24 ` Jens Axboe
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