linux-ext4 - Re: Query about DIO/AIO WRITE throttling and ext4 serialization

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Message-ID: <20110602012209.GQ561@dastard>
Date:	Thu, 2 Jun 2011 11:22:09 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Query about DIO/AIO WRITE throttling and ext4 serialization

On Wed, Jun 01, 2011 at 05:50:49PM -0400, Vivek Goyal wrote:
> Hi,
> 
> If I throttle a DIO/AIO WRITE bio at block device in a cgroup, will it
> lead to any kind of serialization of ext4 file system. IOW, is there any
> filesystem operation which will wait for that DIO/AIO WRITE to finish
> before other filesystem can make progress (fsync, journalling etc?)

Truncate?

(XFS explicitly serialises truncate against in flight DIO,
regardless of whether ext4 does.)

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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