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authorMel Gorman <mgorman@suse.de>2013-10-07 11:28:44 +0100
committerIngo Molnar <mingo@kernel.org>2013-10-29 11:37:39 +0100
commit587fe586f44a48f9691001ba6c45b86c8e4ba21f (patch)
treec3341a2d9fc408045fe14ea0e8608dddcf41d374 /firmware
parent42836f5f8baa33085f547098b74aa98991ee9216 (diff)
mm: Prevent parallel splits during THP migration
THP migrations are serialised by the page lock but on its own that does not prevent THP splits. If the page is split during THP migration then the pmd_same checks will prevent page table corruption but the unlock page and other fix-ups potentially will cause corruption. This patch takes the anon_vma lock to prevent parallel splits during migration. Signed-off-by: Mel Gorman <mgorman@suse.de> Reviewed-by: Rik van Riel <riel@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: <stable@kernel.org> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1381141781-10992-7-git-send-email-mgorman@suse.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
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