]> git.baikalelectronics.ru Git - kernel.git/commit
mm, mempolicy: migrate_to_node should only migrate to node
authorDavid Rientjes <rientjes@google.com>
Tue, 14 Apr 2015 22:46:52 +0000 (15:46 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 14 Apr 2015 23:49:03 +0000 (16:49 -0700)
commitc0590307b5f1f1f1caf6451686c2680fe84923f9
tree67e4b5c902c5a965590047e573bfaa534904efbd
parentb74429a388cb11e7d1b8c2cc1864b99526479d21
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: David Rientjes <rientjes@google.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/mempolicy.c