On Wed, Feb 09, 2011 at 10:21:17PM +0900, Namhyung Kim wrote:
> 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@xxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
> ---
> 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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