mm, thp: abort compaction if migration page cannot be charged to memcg
authorDavid Rientjes <rientjes@google.com>
Wed, 11 Jul 2012 21:02:13 +0000 (14:02 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 16 Jul 2012 16:04:44 +0000 (09:04 -0700)
commit7a08b440fa93e036968102597c8a2ab809a9bdc4
tree97d9a1b575eb0c18de1649253c8062bfc7d4daa4
parentae555e19b697bc90ea3ec004dc0e5541983593fa
mm, thp: abort compaction if migration page cannot be charged to memcg

commit 4bf2bba3750f10aa9e62e6949bc7e8329990f01b upstream.

If page migration cannot charge the temporary page to the memcg,
migrate_pages() will return -ENOMEM.  This isn't considered in memory
compaction however, and the loop continues to iterate over all
pageblocks trying to isolate and migrate pages.  If a small number of
very large memcgs happen to be oom, however, these attempts will mostly
be futile leading to an enormous amout of cpu consumption due to the
page migration failures.

This patch will short circuit and fail memory compaction if
migrate_pages() returns -ENOMEM.  COMPACT_PARTIAL is returned in case
some migrations were successful so that the page allocator will retry.

Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
mm/compaction.c