Commit b360edb4 authored by David Rientjes's avatar David Rientjes Committed by Linus Torvalds
Browse files

mm, mempolicy: migrate_to_node should only migrate to node

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: default avatarDavid Rientjes <>
Reviewed-by: default avatarNaoya Horiguchi <>
Cc: Mel Gorman <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 3cb29d11
......@@ -945,7 +945,8 @@ static struct page *new_node_page(struct page *page, unsigned long node, int **x
return alloc_huge_page_node(page_hstate(compound_head(page)),
return alloc_pages_exact_node(node, GFP_HIGHUSER_MOVABLE, 0);
return alloc_pages_exact_node(node, GFP_HIGHUSER_MOVABLE |
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment