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| author | Zhang Yanfei <zhangyanfei@cn.fujitsu.com> | 2013-07-08 16:00:08 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-09 10:33:22 -0700 |
| commit | 345606d42971fc4ed164fbabac118708d51b8e0a (patch) | |
| tree | 23bd3d638b69536f11360866013cc462e5788043 /mm | |
| parent | b21fbccd4b8aba805cbc231998ec7bf83616a79e (diff) | |
| download | lwn-345606d42971fc4ed164fbabac118708d51b8e0a.tar.gz lwn-345606d42971fc4ed164fbabac118708d51b8e0a.zip | |
mm/page_alloc.c: remove unlikely() from the current_order test
In __rmqueue_fallback(), current_order loops down from MAX_ORDER - 1 to
the order passed. MAX_ORDER is typically 11 and pageblock_order is
typically 9 on x86. Integer division truncates, so pageblock_order / 2
is 4. For the first eight iterations, it's guaranteed that
current_order >= pageblock_order / 2 if it even gets that far!
So just remove the unlikely(), it's completely bogus.
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Suggested-by: David Rientjes <rientjes@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/page_alloc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 27f9d4beac98..b5855e545eec 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1046,7 +1046,7 @@ __rmqueue_fallback(struct zone *zone, int order, int start_migratetype) * MIGRATE_CMA areas. */ if (!is_migrate_cma(migratetype) && - (unlikely(current_order >= pageblock_order / 2) || + (current_order >= pageblock_order / 2 || start_migratetype == MIGRATE_RECLAIMABLE || page_group_by_mobility_disabled)) { int pages; |