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

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Date:	Fri, 9 Oct 2009 18:58:47 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Jens Axboe <jens.axboe@...cle.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 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?

Thanks,
Fengguang

---
writeback: kill space in debugfs item name

The space is not script friendly, kill it.

CC: Jens Axboe <jens.axboe@...cle.com> 
Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
---
 mm/backing-dev.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux.orig/mm/backing-dev.c	2009-10-09 10:05:27.000000000 +0800
+++ linux/mm/backing-dev.c	2009-10-09 18:55:27.000000000 +0800
@@ -92,7 +92,7 @@ static int bdi_debug_stats_show(struct s
 		   "BdiDirtyThresh:   %8lu kB\n"
 		   "DirtyThresh:      %8lu kB\n"
 		   "BackgroundThresh: %8lu kB\n"
-		   "WriteBack threads:%8lu\n"
+		   "WritebackThreads: %8lu\n"
 		   "b_dirty:          %8lu\n"
 		   "b_io:             %8lu\n"
 		   "b_more_io:        %8lu\n"
--
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