From: Christoph Hellwig <hch@lst.de>
To: "Darrick J. Wong" <djwong@us.ibm.com>
Cc: Christoph Hellwig <hch@lst.de>, Ric Wheeler <rwheeler@redhat.com>,
Andreas Dilger <adilger.kernel@dilger.ca>,
"Ted Ts'o" <tytso@mit.edu>, Mingming Cao <cmm@us.ibm.com>,
linux-ext4 <linux-ext4@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Keith Mannthey <kmannth@us.ibm.com>,
Mingming Cao <mcao@us.ibm.com>, Tejun Heo <tj@kernel.org>,
Josef Bacik <josef@redhat.com>, Mike Snitzer <snitzer@redhat.com>
Subject: Re: Performance testing of various barrier reduction patches [was: Re: [RFC v4] ext4: Coordinate fsync requests]
Date: Sat, 16 Oct 2010 01:40:41 +0200 [thread overview]
Message-ID: <20101015234041.GB1035@lst.de> (raw)
In-Reply-To: <20101015233904.GG25624@tux1.beaverton.ibm.com>
On Fri, Oct 15, 2010 at 04:39:04PM -0700, Darrick J. Wong wrote:
> On Tue, Oct 12, 2010 at 04:14:55PM +0200, Christoph Hellwig wrote:
> > I still think adding code to every filesystem to optimize for a rather
> > stupid use case is not a good idea. I dropped out a bit from the
> > thread in the middle, but what was the real use case for lots of
> > concurrent fsyncs on the same inode again?
>
> The use case I'm looking at is concurrent fsyncs on /different/ inodes,
> actually. We have _n_ different processes, each writing (and fsyncing) its own
> separate file on the same filesystem.
>
> iirc, ext4_sync_file is called with the inode mutex held, which prevents
> concurrent fsyncs on the same inode.
Indeed. Although we could drop it at least for the cache flush
call. We already do this for block devices.
next prev parent reply other threads:[~2010-10-15 23:41 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-29 23:51 [RFC] ext4: Don't send extra barrier during fsync if there are no dirty pages Darrick J. Wong
2010-05-04 0:57 ` Mingming Cao
2010-05-04 14:16 ` Ric Wheeler
2010-05-04 15:45 ` Christoph Hellwig
2010-06-30 12:48 ` tytso
2010-06-30 13:21 ` Ric Wheeler
2010-06-30 13:44 ` tytso
2010-06-30 13:54 ` Ric Wheeler
2010-06-30 19:05 ` Andreas Dilger
2010-07-21 17:16 ` Jan Kara
2010-08-03 0:09 ` Darrick J. Wong
2010-08-03 9:01 ` Christoph Hellwig
2010-08-04 18:16 ` Darrick J. Wong
2010-08-03 13:21 ` Jan Kara
2010-08-03 13:24 ` Avi Kivity
2010-08-04 23:32 ` Ted Ts'o
2010-08-05 2:20 ` Avi Kivity
2010-08-05 16:17 ` Ted Ts'o
2010-08-05 19:13 ` Jeff Moyer
2010-08-05 20:39 ` Ted Ts'o
2010-08-05 20:44 ` Jeff Moyer
2010-05-04 19:49 ` Mingming Cao
2010-06-29 20:51 ` [RFC v2] " Darrick J. Wong
2010-08-05 16:40 ` Ted Ts'o
2010-08-05 16:45 ` Ted Ts'o
2010-08-06 7:04 ` Darrick J. Wong
2010-08-06 10:17 ` Ric Wheeler
2010-08-09 19:53 ` [RFC v3] ext4: Combine barrier requests coming from fsync Darrick J. Wong
2010-08-09 21:07 ` Christoph Hellwig
2010-08-16 16:14 ` Darrick J. Wong
2010-08-19 2:07 ` Darrick J. Wong
2010-08-19 8:53 ` Christoph Hellwig
2010-08-19 9:17 ` Tejun Heo
2010-08-19 15:48 ` Tejun Heo
2010-08-09 21:19 ` Andreas Dilger
2010-08-09 23:38 ` Darrick J. Wong
2010-08-19 2:14 ` [RFC v4] ext4: Coordinate fsync requests Darrick J. Wong
2010-08-23 18:31 ` Performance testing of various barrier reduction patches [was: Re: [RFC v4] ext4: Coordinate fsync requests] Darrick J. Wong
2010-09-23 23:25 ` Darrick J. Wong
2010-09-24 6:24 ` Andreas Dilger
2010-09-24 11:44 ` Ric Wheeler
2010-09-27 23:01 ` Darrick J. Wong
2010-10-08 21:26 ` Darrick J. Wong
2010-10-08 21:56 ` Ric Wheeler
2010-10-11 20:20 ` Darrick J. Wong
2010-10-12 14:14 ` Christoph Hellwig
2010-10-15 23:39 ` Darrick J. Wong
2010-10-15 23:40 ` Christoph Hellwig [this message]
2010-10-16 0:02 ` Darrick J. Wong
2010-10-11 14:33 ` Ted Ts'o
2010-10-18 22:49 ` Darrick J. Wong
2010-10-19 18:28 ` Christoph Hellwig
2010-08-06 7:13 ` [RFC v2] ext4: Don't send extra barrier during fsync if there are no dirty pages Darrick J. Wong
2010-08-06 18:04 ` Ted Ts'o
2010-08-09 19:36 ` Darrick J. Wong
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