linux-kernel - Re: [PATCH 4/4] writeback: Reporting dirty thresholds in /proc/vmstat

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Message-Id: <20100820190603.6003.A69D9226@jp.fujitsu.com>
Date:	Fri, 20 Aug 2010 19:06:35 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Michael Rubin <mrubin@...gle.com>
Cc:	kosaki.motohiro@...fujitsu.com, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	fengguang.wu@...el.com, jack@...e.cz, riel@...hat.com,
	akpm@...ux-foundation.org, david@...morbit.com, npiggin@...nel.dk,
	hch@....de, axboe@...nel.dk
Subject: Re: [PATCH 4/4] writeback: Reporting dirty thresholds in /proc/vmstat

> The kernel already exposes the user desired thresholds in /proc/sys/vm
> with dirty_background_ratio and background_ratio. But the kernel may
> alter the number requested without giving the user any indication that
> is the case.
> 
> Knowing the actual ratios the kernel is honoring can help app developers
> understand how their buffered IO will be sent to the disk.
> 
> 	$ grep threshold /proc/vmstat
> 	nr_dirty_threshold 409111
> 	nr_dirty_background_threshold 818223
> 
> Signed-off-by: Michael Rubin <mrubin@...gle.com>

Looks good to me.
	Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>



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