From: Benjamin LaHaise <bcrl@kvack.org>
To: Gu Zheng <guz.fnst@cn.fujitsu.com>
Cc: axboe@kernel.dk, akpm@linux-foundation.org, jmoyer@redhat.com,
linux-aio@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [RESEND PATCH 4/4] aio: use iovec array rather than the single one
Date: Thu, 24 Jul 2014 11:56:36 -0400 [thread overview]
Message-ID: <20140724155636.GE22390@kvack.org> (raw)
In-Reply-To: <1406109834-4414-4-git-send-email-guz.fnst@cn.fujitsu.com>
On Wed, Jul 23, 2014 at 06:03:54PM +0800, Gu Zheng wrote:
> Previously, we only offer a single iovec to handle all the read/write cases, so
> the PREADV/PWRITEV request always need to alloc more iovec buffer when copying
> user vectors.
> If we use a tmp iovec array rather than the single one, some small PREADV/PWRITEV
> workloads(vector size small than the tmp buffer) will not need to alloc more
> iovec buffer when copying user vectors.
Thanks Gu -- applied to my aio-next tree at
git://git.kvack.org/~bcrl/aio-next.git .
-ben
> Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
> Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
> ---
> fs/aio.c | 10 +++++-----
> 1 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/fs/aio.c b/fs/aio.c
> index f1fede2..df3491a 100644
> --- a/fs/aio.c
> +++ b/fs/aio.c
> @@ -1267,12 +1267,12 @@ static ssize_t aio_setup_vectored_rw(struct kiocb *kiocb,
> if (compat)
> ret = compat_rw_copy_check_uvector(rw,
> (struct compat_iovec __user *)buf,
> - *nr_segs, 1, *iovec, iovec);
> + *nr_segs, UIO_FASTIOV, *iovec, iovec);
> else
> #endif
> ret = rw_copy_check_uvector(rw,
> (struct iovec __user *)buf,
> - *nr_segs, 1, *iovec, iovec);
> + *nr_segs, UIO_FASTIOV, *iovec, iovec);
> if (ret < 0)
> return ret;
>
> @@ -1309,7 +1309,7 @@ static ssize_t aio_run_iocb(struct kiocb *req, unsigned opcode,
> fmode_t mode;
> aio_rw_op *rw_op;
> rw_iter_op *iter_op;
> - struct iovec inline_vec, *iovec = &inline_vec;
> + struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
> struct iov_iter iter;
>
> switch (opcode) {
> @@ -1344,7 +1344,7 @@ rw_common:
> if (!ret)
> ret = rw_verify_area(rw, file, &req->ki_pos, req->ki_nbytes);
> if (ret < 0) {
> - if (iovec != &inline_vec)
> + if (iovec != inline_vecs)
> kfree(iovec);
> return ret;
> }
> @@ -1391,7 +1391,7 @@ rw_common:
> return -EINVAL;
> }
>
> - if (iovec != &inline_vec)
> + if (iovec != inline_vecs)
> kfree(iovec);
>
> if (ret != -EIOCBQUEUED) {
> --
> 1.7.7
--
"Thought is the essence of where you are now."
next prev parent reply other threads:[~2014-07-24 15:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1406109834-4414-1-git-send-email-guz.fnst@cn.fujitsu.com>
[not found] ` <1406109834-4414-4-git-send-email-guz.fnst@cn.fujitsu.com>
2014-07-23 13:25 ` [RESEND PATCH 4/4] aio: use iovec array rather than the single one Jeff Moyer
2014-07-24 1:15 ` Gu Zheng
2014-07-24 15:56 ` Benjamin LaHaise [this message]
2014-07-24 15:55 ` [RESEND PATCH 1/4] aio: remove the needless registration of ring file's private_data Benjamin LaHaise
[not found] ` <1406109834-4414-2-git-send-email-guz.fnst@cn.fujitsu.com>
2014-07-24 15:55 ` [RESEND PATCH 2/4] aio: use the macro rather than the inline magic number Benjamin LaHaise
[not found] ` <1406109834-4414-3-git-send-email-guz.fnst@cn.fujitsu.com>
2014-07-24 15:56 ` [RESEND PATCH 3/4] aio: fix some comments Benjamin LaHaise
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