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authorRik van Riel <riel@redhat.com>2012-03-21 16:33:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-21 17:54:56 -0700
commitaff622495c9a0b56148192e53bdec539f5e147f2 (patch)
tree78f6400d8b6bec3279483006a0e9543e47aa833e /include/linux/mmzone.h
parent7be62de99adcab4449d416977b4274985c5fe023 (diff)
downloadop-kernel-dev-aff622495c9a0b56148192e53bdec539f5e147f2.zip
op-kernel-dev-aff622495c9a0b56148192e53bdec539f5e147f2.tar.gz
vmscan: only defer compaction for failed order and higher
Currently a failed order-9 (transparent hugepage) compaction can lead to memory compaction being temporarily disabled for a memory zone. Even if we only need compaction for an order 2 allocation, eg. for jumbo frames networking. The fix is relatively straightforward: keep track of the highest order at which compaction is succeeding, and only defer compaction for orders at which compaction is failing. Signed-off-by: Rik van Riel <riel@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Hillf Danton <dhillf@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mmzone.h')
-rw-r--r--include/linux/mmzone.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 650ba2f..dff7115 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -365,6 +365,7 @@ struct zone {
*/
unsigned int compact_considered;
unsigned int compact_defer_shift;
+ int compact_order_failed;
#endif
ZONE_PADDING(_pad1_)
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