Now I'm seeing that there are some cases to free all pages in a
pcp lists. In that case, just frees all pages in the lists instead
of being bothered with round-robin lists traversal.
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxx>
---
mm/page_alloc.c | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e8b02771ccea..959c54450ddf 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -596,6 +596,28 @@ static void free_pcppages_bulk(struct zone *zone, int count,
zone->all_unreclaimable = 0;
zone->pages_scanned = 0;
+ /* Simple case: Free all */
+ if (to_free == pcp->count) {
+ LIST_HEAD(freelist);
+
+ for (; migratetype < MIGRATE_PCPTYPES; migratetype++)
+ if (!list_empty(&pcp->lists[migratetype]))
+ list_move(&pcp->lists[migratetype], &freelist);
+
+ while (!list_empty(&freelist)) {
+ struct page *page;
+
+ page = list_first_entry(&freelist, struct page, lru);
+ /* must delete as __free_one_page list manipulates */
+ list_del(&page->lru);
+ /* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
+ __free_one_page(page, zone, 0, page_private(page));
+ trace_mm_page_pcpu_drain(page, 0, page_private(page));
+ to_free--;
+ }
+ VM_BUG_ON(to_free);
+ }
+
while (to_free) {
struct page *page;
struct list_head *list;
--
1.7.4
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