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From: Christoph Hellwig <hch@infradead.org>
To: Avi Kivity <avi@scylladb.com>
Cc: Brian Foster <bfoster@redhat.com>,
	Glauber Costa <glauber@scylladb.com>,
	xfs@oss.sgi.com
Subject: Re: sleeps and waits during io_submit
Date: Tue, 1 Dec 2015 11:41:39 -0800	[thread overview]
Message-ID: <20151201194139.GA19035@infradead.org> (raw)
In-Reply-To: <565DF472.8080101@scylladb.com>

On Tue, Dec 01, 2015 at 09:26:42PM +0200, Avi Kivity wrote:
> It's basically the same thing.  To to this, we'd have get_block either
> return the block's address (if it was in some metadata cache), or, if it was
> not, issue an I/O that fills (part of) that cache, and as its completion
> function, a continuation that reruns __blockdev_direct_IO from the point it
> was stopped so it can submit the data I/O (if the metadata cache was
> completely updated) or issue the next I/O aiming to fill that metadata
> cache, if it was not.

We did something this for blocking reads with great results, and it could be
done similarly for direct I/O I think:

	https://lwn.net/Articles/612483/

Unfortunately Andrew shut it down for odd reasons so it didn't get in.

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  reply	other threads:[~2015-12-01 19:41 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-28  2:43 sleeps and waits during io_submit Glauber Costa
2015-11-30 14:10 ` Brian Foster
2015-11-30 14:29   ` Avi Kivity
2015-11-30 16:14     ` Brian Foster
2015-12-01  9:08       ` Avi Kivity
2015-12-01 13:11         ` Brian Foster
2015-12-01 13:58           ` Avi Kivity
2015-12-01 14:01             ` Glauber Costa
2015-12-01 14:37               ` Avi Kivity
2015-12-01 20:45               ` Dave Chinner
2015-12-01 20:56                 ` Avi Kivity
2015-12-01 23:41                   ` Dave Chinner
2015-12-02  8:23                     ` Avi Kivity
2015-12-01 14:56             ` Brian Foster
2015-12-01 15:22               ` Avi Kivity
2015-12-01 16:01                 ` Brian Foster
2015-12-01 16:08                   ` Avi Kivity
2015-12-01 16:29                     ` Brian Foster
2015-12-01 17:09                       ` Avi Kivity
2015-12-01 18:03                         ` Carlos Maiolino
2015-12-01 19:07                           ` Avi Kivity
2015-12-01 21:19                             ` Dave Chinner
2015-12-01 21:38                               ` Avi Kivity
2015-12-01 23:06                                 ` Dave Chinner
2015-12-02  9:02                                   ` Avi Kivity
2015-12-02 12:57                                     ` Carlos Maiolino
2015-12-02 23:19                                     ` Dave Chinner
2015-12-03 12:52                                       ` Avi Kivity
2015-12-04  3:16                                         ` Dave Chinner
2015-12-08 13:52                                           ` Avi Kivity
2015-12-08 23:13                                             ` Dave Chinner
2015-12-01 18:51                         ` Brian Foster
2015-12-01 19:07                           ` Glauber Costa
2015-12-01 19:35                             ` Brian Foster
2015-12-01 19:45                               ` Avi Kivity
2015-12-01 19:26                           ` Avi Kivity
2015-12-01 19:41                             ` Christoph Hellwig [this message]
2015-12-01 19:50                               ` Avi Kivity
2015-12-02  0:13                             ` Brian Foster
2015-12-02  0:57                               ` Dave Chinner
2015-12-02  8:38                                 ` Avi Kivity
2015-12-02  8:34                               ` Avi Kivity
2015-12-08  6:03                                 ` Dave Chinner
2015-12-08 13:56                                   ` Avi Kivity
2015-12-08 23:32                                     ` Dave Chinner
2015-12-09  8:37                                       ` Avi Kivity
2015-12-01 21:04                 ` Dave Chinner
2015-12-01 21:10                   ` Glauber Costa
2015-12-01 21:39                     ` Dave Chinner
2015-12-01 21:24                   ` Avi Kivity
2015-12-01 21:31                     ` Glauber Costa
2015-11-30 15:49   ` Glauber Costa
2015-12-01 13:11     ` Brian Foster
2015-12-01 13:39       ` Glauber Costa
2015-12-01 14:02         ` Brian Foster
2015-11-30 23:10 ` Dave Chinner
2015-11-30 23:51   ` Glauber Costa
2015-12-01 20:30     ` Dave Chinner

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