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From: Zheng Liu <gnehzuil.liu@gmail.com>
To: Dave Chinner <david@fromorbit.com>
Cc: tytso@mit.edu, darrick.wong@oracle.com, xfs@oss.sgi.com,
	hch@infradead.org, linux-fsdevel@vger.kernel.org,
	linux-ext4@vger.kernel.org
Subject: Re: A huge latency in ext4 and xfs because of stable page write
Date: Wed, 12 Dec 2012 13:13:32 +0800	[thread overview]
Message-ID: <20121212051332.GA6718@gmail.com> (raw)
In-Reply-To: <20121212044948.GW16353@dastard>

On Wed, Dec 12, 2012 at 03:49:49PM +1100, Dave Chinner wrote:
[cut...]
> > > > Hence, I wonder whether or not we could revert stable page write temporarily.
> > > > After it is improved, we could add it back again.
> > > 
> > > The plan is to turn it off for filesystems/devices that don't
> > > require it. That list of devices will grow in future, so you
> > > probably should plan to handle latencies in the application
> > > properly...
> > 
> > I wonder whether we can provide a sysctl to turn on/off stable page
> > write.  At least we need to give sysadmin an opportunity to control it.
> 
> That's already been considered and discarded because turning off
> stable pages on devices that require it will cause validation or
> data corruption problems. The discussion was for these patches (and
> I think a followup series as well):
> 
> http://www.spinics.net/lists/linux-fsdevel/msg59421.html

Thanks for pointing out.  So now it seems that only I can do is to
present a proposal to revert stable page write temporarily because it
causes a huge latency for some applications.

Thanks,
                                                - Zheng

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  reply	other threads:[~2012-12-12  5:13 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-12-11  8:45 A huge latency in ext4 and xfs because of stable page write Zheng Liu
2012-12-11  8:45 ` Zheng Liu
2012-12-11 11:17 ` Dave Chinner
2012-12-12  4:18   ` Zheng Liu
2012-12-12  4:49     ` Dave Chinner
2012-12-12  5:13       ` Zheng Liu [this message]
2012-12-12  7:23         ` Stefan Ring
2012-12-12  8:17           ` Zheng Liu
2012-12-12 23:07           ` Dave Chinner
2012-12-12 19:47         ` Darrick J. Wong
2012-12-13  2:30           ` Zheng Liu

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