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

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Message-Id: <20100822192710.6018.A69D9226@jp.fujitsu.com>
Date:	Sun, 22 Aug 2010 19:27:54 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com, Michael Rubin <mrubin@...gle.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>

sorry, this is mistake. Wu pointed out this patch is unnecessary.


Wu wrote: 
> I realized that the dirty thresholds has already been exported here:
> 
> $ grep Thresh  /debug/bdi/8:0/stats
> BdiDirtyThresh:     381000 kB
> DirtyThresh:       1719076 kB
> BackgroundThresh:   859536 kB
> 
> So why not use that interface directly?



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