tree aaa5eda6bae7adc04dc5cbd513f5c25ac684af97
parent 5db8a73a8d7cc6a66afbf25ed7fda338caa8f5f9
author Shaohua Li <shaohua.li@intel.com> 1308175729 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1308193442 -0700

compaction: checks correct fragmentation index

fragmentation_index() returns -1000 when the allocation might succeed
This doesn't match the comment and code in compaction_suitable(). I
thought compaction_suitable should return COMPACT_PARTIAL in -1000
case, because in this case allocation could succeed depending on
watermarks.

The impact of this is that compaction starts and compact_finished() is
called which rechecks the watermarks and the free lists.  It should have
the same result in that compaction should not start but is more expensive.

Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>