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authorNamhyung Kim <namhyung@gmail.com>2011-03-22 16:32:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-22 17:44:02 -0700
commit1d16871d8c96deadc5f9753b6b096074f2cbcbe1 (patch)
tree9f3f0c5a60e7a5bf4bfa9f2bd4c9492db36cecfe /mm/page_alloc.c
parente64a782fec684c29a8204c51b3cb554dce588592 (diff)
mm: batch-free pcp list if possible
free_pcppages_bulk() frees pages from pcp lists in a round-robin fashion by keeping batch_free counter. But it doesn't need to spin if there is only one non-empty list. This can be checked by batch_free == MIGRATE_PCPTYPES. [akpm@linux-foundation.org: fix comment] Signed-off-by: Namhyung Kim <namhyung@gmail.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mel@csn.ul.ie> 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.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 36a168e383b..426056aff12 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -614,6 +614,10 @@ static void free_pcppages_bulk(struct zone *zone, int count,
list = &pcp->lists[migratetype];
} while (list_empty(list));
+ /* This is the only non-empty list. Free them all. */
+ if (batch_free == MIGRATE_PCPTYPES)
+ batch_free = to_free;
+
do {
page = list_entry(list->prev, struct page, lru);
/* must delete as __free_one_page list manipulates */