mm: add free_hot_cold_page_list() helper
This patch adds helper free_hot_cold_page_list() to free list of 0-order
pages. It frees pages directly from list without temporary page-vector.
It also calls trace_mm_pagevec_free() to simulate pagevec_free()
behaviour.
bloat-o-meter:
add/remove: 1/1 grow/shrink: 1/3 up/down: 267/-295 (-28)
function old new delta
free_hot_cold_page_list - 264 +264
get_page_from_freelist 2129 2132 +3
__pagevec_free 243 239 -4
split_free_page 380 373 -7
release_pages 606 510 -96
free_page_list 188 - -188
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/swap.c b/mm/swap.c
index a91caf7..67a09a6 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -585,11 +585,10 @@
void release_pages(struct page **pages, int nr, int cold)
{
int i;
- struct pagevec pages_to_free;
+ LIST_HEAD(pages_to_free);
struct zone *zone = NULL;
unsigned long uninitialized_var(flags);
- pagevec_init(&pages_to_free, cold);
for (i = 0; i < nr; i++) {
struct page *page = pages[i];
@@ -620,19 +619,12 @@
del_page_from_lru(zone, page);
}
- if (!pagevec_add(&pages_to_free, page)) {
- if (zone) {
- spin_unlock_irqrestore(&zone->lru_lock, flags);
- zone = NULL;
- }
- __pagevec_free(&pages_to_free);
- pagevec_reinit(&pages_to_free);
- }
+ list_add(&page->lru, &pages_to_free);
}
if (zone)
spin_unlock_irqrestore(&zone->lru_lock, flags);
- pagevec_free(&pages_to_free);
+ free_hot_cold_page_list(&pages_to_free, cold);
}
EXPORT_SYMBOL(release_pages);
