linux-kernel - Re: [patch] mm, mempolicy: migrate_to

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Message-ID: <20150227061358.GA7469@hori1.linux.bs1.fc.nec.co.jp>
Date:	Fri, 27 Feb 2015 06:13:58 +0000
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [patch] mm, mempolicy: migrate_to_node should only migrate to
 node

On Tue, Feb 24, 2015 at 03:18:06PM -0800, David Rientjes wrote:
> migrate_to_node() is intended to migrate a page from one source node to a 
> target node.
> 
> Today, migrate_to_node() could end up migrating to any node, not only the 
> target node.  This is because the page migration allocator, 
> new_node_page() does not pass __GFP_THISNODE to alloc_pages_exact_node().  
> This causes the target node to be preferred but allows fallback to any 
> other node in order of affinity.
> 
> Prevent this by allocating with __GFP_THISNODE.  If memory is not 
> available, -ENOMEM will be returned as appropriate.
> 
> Signed-off-by: David Rientjes <rientjes@...gle.com>

Make sense to me.

Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>--
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