linux-kernel - Re: A unresponsive file system can hang all I/O in the system on linux-2.6.23-rc6 (dirty

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Date:	Fri, 28 Sep 2007 20:48:59 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Trond Myklebust <trond.myklebust@....uio.no>,
	Chakri n <chakriin5@...il.com>,
	linux-pm <linux-pm@...ts.linux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>, nfs@...ts.sourceforge.net
Subject: Re: A unresponsive file system can hang all I/O in the system on
	linux-2.6.23-rc6 (dirty_thresh problem?)


On Fri, 2007-09-28 at 11:49 -0700, Andrew Morton wrote:

> Do you know where the stalls are occurring?  throttle_vm_writeout(), or via
> direct calls to congestion_wait() from page_alloc.c and vmscan.c?  (running
> sysrq-w five or ten times will probably be enough to determine this)

would it make sense to instrument congestion_wait() callsites with
vmstats?

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