linux-kernel - Re: fsync occasionally very slow

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Message-Id: <20070126031654.a41fe374.akpm@osdl.org>
Date:	Fri, 26 Jan 2007 03:16:54 -0800
From:	Andrew Morton <akpm@...l.org>
To:	"Matthew Kirk" <mkirk01@....com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: Re: fsync occasionally very slow

On Fri, 26 Jan 2007 05:37:38 -0500
"Matthew Kirk" <mkirk01@....com> wrote:

> I am working on an application that fsync(2) files and directories as
> needed.    I’m seeing intermittent stalls on fsync that can last many
> seconds.

Please generate an all-task backtrace during the stall via:

dmesg -n 8
<wait for a stall>
echo t > /prov/sysrq-trigger
dmesg -s 1000000 > foo

and send foo.
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