linux-kernel - Re: [PATCH 5/8] Use correct numa policy node for transparent hugepages

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Message-Id: <20110307173838.8A10.A69D9226@jp.fujitsu.com>
Date:	Mon,  7 Mar 2011 17:38:53 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	kosaki.motohiro@...fujitsu.com, akpm@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 5/8] Use correct numa policy node for transparent hugepages

> From: Andi Kleen <ak@...ux.intel.com>
> 
> Pass down the correct node for a transparent hugepage allocation.
> Most callers continue to use the current node, however the hugepaged
> daemon now uses the previous node of the first to be collapsed page
> instead. This ensures that khugepaged does not mess up local memory
> for an existing process which uses local policy.
> 
> The choice of node is somewhat primitive currently: it just
> uses the node of the first page in the pmd range. An alternative
> would be to look at multiple pages and use the most popular
> node. I used the simplest variant for now which should work
> well enough for the case of all pages being on the same node.
> 
> Acked-by: Andrea Arcangeli <aarcange@...hat.com>
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>



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