linux-kernel - Re: [PATCH] writeback: account IO throttling wait as iowait

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Message-ID: <20091009110059.GA9228@kernel.dk>
Date:	Fri, 9 Oct 2009 13:01:00 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>,
	Christoph Hellwig <hch@...radead.org>,
	Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	"Li, Shaohua" <shaohua.li@...el.com>,
	Myklebust Trond <Trond.Myklebust@...app.com>,
	Jan Kara <jack@...e.cz>, Nick Piggin <npiggin@...e.de>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] writeback: account IO throttling wait as iowait

On Fri, Oct 09 2009, Wu Fengguang wrote:
> On Fri, Oct 09, 2009 at 06:41:05PM +0800, Jens Axboe wrote:
> > > ---
> > > writeback: account IO throttling wait as iowait
> > > 
> > > It makes sense to do IOWAIT when someone is blocked
> > > due to IO throttle, as suggested by Kame and Peter.
> > > 
> > > There is an old comment for not doing IOWAIT on throttle,
> > > however it has been mismatching the code for a long time.
> > > 
> > > If we stop accounting IOWAIT for 2.6.32, it could be an
> > > undesirable behavior change. So restore the io_schedule.
> > 
> > Thanks, queued up.
> 
> Thank you. Would you also pick up this one if it's OK to you?

Sure, looks appropriate.

-- 
Jens Axboe

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