linux-kernel - Re: [PATCH 2/2] writeback: Adding pages_dirtied and pages_entered

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Message-Id: <20100806091548.31ED.A69D9226@jp.fujitsu.com>
Date:	Fri,  6 Aug 2010 09:18:59 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Michael Rubin <mrubin@...gle.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, jack@...e.cz, david@...morbit.com, hch@....de,
	axboe@...nel.dk
Subject: Re: [PATCH 2/2] writeback: Adding pages_dirtied and  pages_entered_writeback

> On Thu, Aug 5, 2010 at 4:56 PM, KOSAKI Motohiro
> <kosaki.motohiro@...fujitsu.com> wrote:
> > /proc/vmstat already have both.
> >
> > cat /proc/vmstat |grep nr_dirty
> > cat /proc/vmstat |grep nr_writeback
> >
> > Also, /sys/devices/system/node/node0/meminfo show per-node stat.
> >
> > Perhaps, I'm missing your point.
> 
> These only show the number of dirty pages present in the system at the
> point they are queried.
> The counter I am trying to add are increasing over time. They allow
> developers to see rates of pages being dirtied and entering writeback.
> Which is very helpful.

Usually administrators get the data two times and subtract them. Isn't it sufficient?


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