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| author | Mel Gorman <mgorman@suse.de> | 2014-06-04 16:10:05 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-04 16:54:08 -0700 |
| commit | 65bb371984d6a2c909244eb749e482bb40b72e36 (patch) | |
| tree | 03a55a0eb6bc7fbf4778539d26fc3be8f8ec9d52 /mm/page_alloc.c | |
| parent | 0bd62b1190607e4f1b3c2927ba48672a1cf2a83d (diff) | |
| download | blackbird-op-linux-65bb371984d6a2c909244eb749e482bb40b72e36.tar.gz blackbird-op-linux-65bb371984d6a2c909244eb749e482bb40b72e36.zip | |
mm: page_alloc: do not update zlc unless the zlc is active
The zlc is used on NUMA machines to quickly skip over zones that are full.
However it is always updated, even for the first zone scanned when the
zlc might not even be active. As it's a write to a bitmap that
potentially bounces cache line it's deceptively expensive and most
machines will not care. Only update the zlc if it was active.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
| -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 d88d67584765..8e766241cf56 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2035,7 +2035,7 @@ try_this_zone: if (page) break; this_zone_full: - if (IS_ENABLED(CONFIG_NUMA)) + if (IS_ENABLED(CONFIG_NUMA) && zlc_active) zlc_mark_zone_full(zonelist, z); } |
