linux-kernel - Re: [PATCH 4/5] add isolate pages vmstat

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Date:	Tue, 07 Jul 2009 13:23:48 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
CC:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 4/5] add isolate pages vmstat

Christoph Lameter wrote:
> On Tue, 7 Jul 2009, KOSAKI Motohiro wrote:
> 
>> +++ b/include/linux/mmzone.h
>> @@ -100,6 +100,8 @@ enum zone_stat_item {
>>  	NR_BOUNCE,
>>  	NR_VMSCAN_WRITE,
>>  	NR_WRITEBACK_TEMP,	/* Writeback using temporary buffers */
>> +	NR_ISOLATED_ANON,	/* Temporary isolated pages from anon lru */
>> +	NR_ISOLATED_FILE,	/* Temporary isolated pages from file lru */
> 
> LRU counters are rarer in use then the counters used for dirty pages etc.
> 
> Could you move the counters for reclaim into a separate cacheline?

I don't get the point of that - these counters are
per-cpu anyway, so why would they need to be in a
separate cacheline?
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