linux-kernel - Re: [resend][PATCH] mm: Restore zone->all

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Date:	Wed, 13 Jan 2010 22:33:03 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Huang Shijie <shijie8@...il.com>
Subject: Re: [resend][PATCH] mm: Restore zone->all_unreclaimable to independence
 word

On Thu, 14 Jan 2010, KOSAKI Motohiro wrote:

> commit e815af95 (change all_unreclaimable zone member to flags) chage
> all_unreclaimable member to bit flag. but It have undesireble side
> effect.
> free_one_page() is one of most hot path in linux kernel and increasing
> atomic ops in it can reduce kernel performance a bit.
> 
> Thus, this patch revert such commit partially. at least
> all_unreclaimable shouldn't share memory word with other zone flags.
> 

I still think you need to quantify this; saying you don't have a large 
enough of a machine that will benefit from it isn't really a rationale for 
the lack of any data supporting your claim.  We should be basing VM 
changes on data, not on speculation that there's a measurable impact 
here.

Perhaps you could ask a colleague or another hacker to run a benchmark for 
you so that the changelog is complete?
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