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

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Message-ID: <20110601215049.GC17449@redhat.com>
Date:	Wed, 1 Jun 2011 17:50:49 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	linux-ext4@...r.kernel.org
Subject: Query about DIO/AIO WRITE throttling and ext4 serialization

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?)

I know that for throttling of buffered WRITES I do run into serialization
issues hence I was thinking of moving throttling buffered WRITE while
they are entering page cache and get rid of issues related to filesystem
serialization. I am not sure about DIO/AIO WRITES hence the question.

Thanks
Vivek
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