linux-kernel - RE: [PATCH] getdelays: show average CPU/IO/SWAP/RECLAIM delays

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Date:	Wed, 4 May 2011 23:37:46 -0400
From:	Satoru Moriya <satoru.moriya@....com>
To:	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Mel Gorman <mel@...ux.vnet.ibm.com>,
	Dave Young <hidave.darkstar@...il.com>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux.com>,
	Dave Chinner <david@...morbit.com>,
	David Rientjes <rientjes@...gle.com>
Subject: RE: [PATCH] getdelays: show average CPU/IO/SWAP/RECLAIM delays

On 05/02/2011 10:02 AM, Wu Fengguang wrote: 
> I find it very handy to show the average delays in milliseconds.
> 
> Example output (on 100 concurrent dd reading sparse files):
> 
> CPU             count     real total  virtual total    delay total  delay average
>                   986     3223509952     3207643301    38863410579         39.415ms
> IO              count    delay total  delay average
>                     0              0              0ms
> SWAP            count    delay total  delay average
>                     0              0              0ms
> RECLAIM         count    delay total  delay average
>                  1059     5131834899              4ms
> dd: read=0, write=0, cancelled_write=0
> 
> CC: Mel Gorman <mel@...ux.vnet.ibm.com>
> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>

This is useful for me.

Reviewed-by: Satoru Moriya <satoru.moriya@....com>

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