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From: "Darrick J. Wong" <[email protected]>
To: Jens Axboe <[email protected]>
Cc: [email protected], [email protected], [email protected],
	[email protected], [email protected]
Subject: Re: [PATCH 2/8] iomap: add IOMAP_DIO_INLINE_COMP
Date: Fri, 21 Jul 2023 08:16:04 -0700	[thread overview]
Message-ID: <20230721151604.GL11352@frogsfrogsfrogs> (raw)
In-Reply-To: <[email protected]>

On Thu, Jul 20, 2023 at 12:13:04PM -0600, Jens Axboe wrote:
> Rather than gate whether or not we need to punt a dio completion to a
> workqueue on whether the IO is a write or not, add an explicit flag for
> it. For now we treat them the same, reads always set the flags and async
> writes do not.
> 
> No functional changes in this patch.
> 
> Signed-off-by: Jens Axboe <[email protected]>

Looks good,
Reviewed-by: Darrick J. Wong <[email protected]>

--D

> ---
>  fs/iomap/direct-io.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
> index 0ce60e80c901..c654612b24e5 100644
> --- a/fs/iomap/direct-io.c
> +++ b/fs/iomap/direct-io.c
> @@ -20,6 +20,7 @@
>   * Private flags for iomap_dio, must not overlap with the public ones in
>   * iomap.h:
>   */
> +#define IOMAP_DIO_INLINE_COMP	(1 << 27)
>  #define IOMAP_DIO_WRITE_FUA	(1 << 28)
>  #define IOMAP_DIO_NEED_SYNC	(1 << 29)
>  #define IOMAP_DIO_WRITE		(1 << 30)
> @@ -171,8 +172,10 @@ void iomap_dio_bio_end_io(struct bio *bio)
>  		goto release_bio;
>  	}
>  
> -	/* Read completion can always complete inline. */
> -	if (!(dio->flags & IOMAP_DIO_WRITE)) {
> +	/*
> +	 * Flagged with IOMAP_DIO_INLINE_COMP, we can complete it inline
> +	 */
> +	if (dio->flags & IOMAP_DIO_INLINE_COMP) {
>  		WRITE_ONCE(iocb->private, NULL);
>  		iomap_dio_complete_work(&dio->aio.work);
>  		goto release_bio;
> @@ -527,6 +530,9 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
>  		iomi.flags |= IOMAP_NOWAIT;
>  
>  	if (iov_iter_rw(iter) == READ) {
> +		/* reads can always complete inline */
> +		dio->flags |= IOMAP_DIO_INLINE_COMP;
> +
>  		if (iomi.pos >= dio->i_size)
>  			goto out_free_dio;
>  
> -- 
> 2.40.1
> 

  parent reply	other threads:[~2023-07-21 15:16 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-07-20 18:13 [PATCHSET v4 0/8] Improve async iomap DIO performance Jens Axboe
2023-07-20 18:13 ` [PATCH 1/8] iomap: cleanup up iomap_dio_bio_end_io() Jens Axboe
2023-07-21  6:14   ` Christoph Hellwig
2023-07-21 15:13   ` Darrick J. Wong
2023-07-20 18:13 ` [PATCH 2/8] iomap: add IOMAP_DIO_INLINE_COMP Jens Axboe
2023-07-21  6:14   ` Christoph Hellwig
2023-07-21 15:16   ` Darrick J. Wong [this message]
2023-07-20 18:13 ` [PATCH 3/8] iomap: treat a write through cache the same as FUA Jens Axboe
2023-07-21  6:15   ` Christoph Hellwig
2023-07-21 14:04     ` Jens Axboe
2023-07-21 15:55       ` Darrick J. Wong
2023-07-21 16:03         ` Jens Axboe
2023-07-20 18:13 ` [PATCH 4/8] iomap: completed polled IO inline Jens Axboe
2023-07-21  6:16   ` Christoph Hellwig
2023-07-21 15:19   ` Darrick J. Wong
2023-07-21 21:43   ` Dave Chinner
2023-07-22  3:10     ` Jens Axboe
2023-07-22 23:05       ` Dave Chinner
2023-07-24 22:35         ` Jens Axboe
2023-07-22 16:54     ` Jens Axboe
2023-07-20 18:13 ` [PATCH 5/8] iomap: only set iocb->private for polled bio Jens Axboe
2023-07-21  6:18   ` Christoph Hellwig
2023-07-21 15:35   ` Darrick J. Wong
2023-07-21 15:37     ` Jens Axboe
2023-07-20 18:13 ` [PATCH 6/8] fs: add IOCB flags related to passing back dio completions Jens Axboe
2023-07-21  6:18   ` Christoph Hellwig
2023-07-21 15:48   ` Darrick J. Wong
2023-07-21 15:53     ` Jens Axboe
2023-07-20 18:13 ` [PATCH 7/8] io_uring/rw: add write support for IOCB_DIO_DEFER Jens Axboe
2023-07-21  6:19   ` Christoph Hellwig
2023-07-21 15:50   ` Darrick J. Wong
2023-07-21 15:53     ` Jens Axboe
2023-07-20 18:13 ` [PATCH 8/8] iomap: support IOCB_DIO_DEFER Jens Axboe
2023-07-21  6:19   ` Christoph Hellwig
2023-07-21 16:01   ` Darrick J. Wong
2023-07-21 16:30     ` Jens Axboe
2023-07-21 22:05   ` Dave Chinner
2023-07-22  3:12     ` Jens Axboe

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