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

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Message-ID: <AANLkTimD4jkkPpnhQhR+OF=6=dWV2dJj4M_DGfAmHgRQ@mail.gmail.com>
Date:	Thu, 5 Aug 2010 17:11:35 -0700
From:	Michael Rubin <mrubin@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	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.

mrubin
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