linux-kernel - Re: I/O blocked while dirty pages are being flushed

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Message-ID: <514ED516.4020009@acm.org>
Date:	Sun, 24 Mar 2013 11:27:34 +0100
From:	Bart Van Assche <bvanassche@....org>
To:	Fredrik Tolf <fredrik@...da2000.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: I/O blocked while dirty pages are being flushed

On 03/24/13 06:12, Fredrik Tolf wrote:
> While this flush is running, I find that many a process goes into disk
> sleep waiting for the flush to complete. This includes the process
> manipulating the mmapped file whenever it tries to redirty a page
> currently waiting to be flushed, but also, for instance, programs that
> write() to log files (since, I guess, the buffer page backing the last
> written portion of the log file is being flushed).

Had you already encountered this article: Jonathan Corbet, The trouble 
with stable pages, March 13, 2012 (http://lwn.net/Articles/486311/) ?

Bart.
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