Re: [patch] mm, mempolicy: migrate_to_node should only migrate to node

[Naoya Horiguchi]

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@xxxxxxxxxx>

Make sense to me.

Reviewed-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>--
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