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authorRik van Riel <riel@redhat.com>2012-03-21 16:33:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-21 17:54:56 -0700
commitfe2c2a106663130a5ab45cb0e3414b52df2fff0c (patch)
tree4c2651ee4e33c73069bc41fa936b5227c9d9f2a9 /mm/compaction.c
parent67f96aa252e606cdf6c3cf1032952ec207ec0cf0 (diff)
vmscan: reclaim at order 0 when compaction is enabled
When built with CONFIG_COMPACTION, kswapd should not try to free contiguous pages, because it is not trying hard enough to have a real chance at being successful, but still disrupts the LRU enough to break other things. Do not do higher order page isolation unless we really are in lumpy reclaim mode. Stop reclaiming pages once we have enough free pages that compaction can deal with things, and we hit the normal order 0 watermarks used by kswapd. Also remove a line of code that increments balanced right before exiting the function. 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 'mm/compaction.c')
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