linux-kernel - Re: [PATCH -mm 13/25] Noreclaim LRU Infrastructure

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Message-ID: <484FBFB7.4070506@firstfloor.org>
Date:	Wed, 11 Jun 2008 14:06:15 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Paul Mundt <lethal@...ux-sh.org>, Rik van Riel <riel@...hat.com>,
	clameter@....com, linux-kernel@...r.kernel.org,
	lee.schermerhorn@...com, kosaki.motohiro@...fujitsu.com,
	linux-mm@...ck.org, eric.whitney@...com,
	Ingo Molnar <mingo@...e.hu>, Andy Whitcroft <apw@...dowen.org>
Subject: Re: [PATCH -mm 13/25] Noreclaim LRU Infrastructure


> Andi has suggested that we can remove the node-ID encoding from
> page.flags on x86 because that info is available elsewhere, although a
> bit more slowly.
> 
> <looks at page_zone(), wonders whether we care about performance anyway>

It would be just pfn_to_nid(page_pfn(page)) for 32bit && CONFIG_NUMA.
-sh should have that too.

Only trouble is that it needs some reordering because right now page_pfn
is not defined early enough.

> There wouldn't be much point in doing that unless we did it for all
> 32-bit architectures.  How much trouble would it cause sh?

Probably very little from a quick look at the source.

-Andi
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