netdev - Re: [patch v2 2/3] mm, thp: really limit transparent hugepage allocation to local node

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Date:	Mon, 02 Mar 2015 14:47:21 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	Pravin Shelar <pshelar@...ira.com>,
	Jarno Rajahalme <jrajahalme@...ira.com>,
	Li Zefan <lizefan@...wei.com>,
	Greg Thelen <gthelen@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, netdev@...r.kernel.org,
	cgroups@...r.kernel.org, dev@...nvswitch.org
Subject: Re: [patch v2 2/3] mm, thp: really limit transparent hugepage allocation
 to local node

On 02/27/2015 11:17 PM, David Rientjes wrote:
> Commit 077fcf116c8c ("mm/thp: allocate transparent hugepages on local
> node") restructured alloc_hugepage_vma() with the intent of only
> allocating transparent hugepages locally when there was not an effective
> interleave mempolicy.
>
> alloc_pages_exact_node() does not limit the allocation to the single
> node, however, but rather prefers it.  This is because __GFP_THISNODE is
> not set which would cause the node-local nodemask to be passed.  Without
> it, only a nodemask that prefers the local node is passed.
>
> Fix this by passing __GFP_THISNODE and falling back to small pages when
> the allocation fails.
>
> Commit 9f1b868a13ac ("mm: thp: khugepaged: add policy for finding target
> node") suffers from a similar problem for khugepaged, which is also
> fixed.
>
> Fixes: 077fcf116c8c ("mm/thp: allocate transparent hugepages on local node")
> Fixes: 9f1b868a13ac ("mm: thp: khugepaged: add policy for finding target node")
> Signed-off-by: David Rientjes <rientjes@...gle.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

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