Messages in this thread Patch in this message | | | From | Namhyung Kim <> | Subject | [PATCH] mm: batch-free pcp list if possible | Date | Wed, 9 Feb 2011 22:21:17 +0900 |
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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.
Signed-off-by: Namhyung Kim <namhyung@gmail.com> --- mm/page_alloc.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index a873e61e312e..470fb42e303c 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 an 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 */ -- 1.7.3.4.600.g982838b0
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