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 3/9] iomap: treat a write through cache the same as FUA
Date: Fri, 21 Jul 2023 09:47:44 -0700 [thread overview]
Message-ID: <20230721164744.GW11352@frogsfrogsfrogs> (raw)
In-Reply-To: <[email protected]>
On Fri, Jul 21, 2023 at 10:27:16AM -0600, Jens Axboe wrote:
> On 7/21/23 10:25?AM, Darrick J. Wong wrote:
> >> @@ -560,12 +562,15 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
> >>
> >> /*
> >> * For datasync only writes, we optimistically try
> >> - * using FUA for this IO. Any non-FUA write that
> >> - * occurs will clear this flag, hence we know before
> >> - * completion whether a cache flush is necessary.
> >> + * using WRITE_THROUGH for this IO. Stable writes are
> >
> > "...using WRITE_THROUGH for this IO. This flag requires either FUA
> > writes through the device's write cache, or a normal write..."
> >
> >> @@ -627,10 +632,10 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
> >> iomap_dio_set_error(dio, ret);
> >>
> >> /*
> >> - * If all the writes we issued were FUA, we don't need to flush the
> >> + * If all the writes we issued were stable, we don't need to flush the
> >
> > "If all the writes we issued were already written through to the media,
> > we don't need to flush..."
> >
> > With those fixes,
> > Reviewed-by: Darrick J. Wong <[email protected]>
>
> If you're queueing up this series, could you just make those two edits
> while applying? I don't want to spam resend with just a comment change,
> at least if I can avoid it...
How about pushing the updated branch, tagging it with the cover letter
as the message, and sending me a pull request? Linus has been very
receptive to preserving cover letters this way.
--D
> --
> Jens Axboe
>
next prev parent reply other threads:[~2023-07-21 16:47 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-21 16:16 [PATCHSET v5 0/9] Improve async iomap DIO performance Jens Axboe
2023-07-21 16:16 ` [PATCH 1/9] iomap: cleanup up iomap_dio_bio_end_io() Jens Axboe
2023-07-21 16:16 ` [PATCH 2/9] iomap: add IOMAP_DIO_INLINE_COMP Jens Axboe
2023-07-21 16:16 ` [PATCH 3/9] iomap: treat a write through cache the same as FUA Jens Axboe
2023-07-21 16:25 ` Darrick J. Wong
2023-07-21 16:27 ` Jens Axboe
2023-07-21 16:47 ` Darrick J. Wong [this message]
2023-07-21 16:52 ` Jens Axboe
2023-07-21 16:16 ` [PATCH 4/9] iomap: completed polled IO inline Jens Axboe
2023-07-21 16:16 ` [PATCH 5/9] iomap: only set iocb->private for polled bio Jens Axboe
2023-07-21 16:16 ` [PATCH 6/9] fs: add IOCB flags related to passing back dio completions Jens Axboe
2023-07-21 16:28 ` Darrick J. Wong
2023-07-21 16:30 ` Jens Axboe
2023-07-21 16:43 ` Jens Axboe
2023-07-21 16:16 ` [PATCH 7/9] io_uring/rw: add write support for IOCB_DIO_CALLER_COMP Jens Axboe
2023-07-21 16:29 ` Darrick J. Wong
2023-07-21 16:16 ` [PATCH 8/9] iomap: support IOCB_DIO_CALLER_COMP Jens Axboe
2023-07-21 16:16 ` [PATCH 9/9] iomap: use an unsigned type for IOMAP_DIO_* defines Jens Axboe
2023-07-21 16:29 ` Darrick J. Wong
2023-07-24 16:36 ` Christoph Hellwig
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