Commit 1d16871d authored by Namhyung Kim's avatar Namhyung Kim Committed by Linus Torvalds

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: 's avatarNamhyung Kim <namhyung@gmail.com>
Acked-by: 's avatarJohannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: 's avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e64a782f
......@@ -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 */
......
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