The patch titled
mm: batch-free pcp list if possible
has been added to the -mm tree. Its filename is
mm-batch-free-pcp-list-if-possible.patch
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------------------------------------------------------
Subject: mm: batch-free pcp list if possible
From: Namhyung Kim <namhyung@xxxxxxxxx>
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>
Cc: Mel Gorman <mel@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN mm/page_alloc.c~mm-batch-free-pcp-list-if-possible mm/page_alloc.c
--- a/mm/page_alloc.c~mm-batch-free-pcp-list-if-possible
+++ a/mm/page_alloc.c
@@ -614,6 +614,10 @@ static void free_pcppages_bulk(struct zo
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 */
_
Patches currently in -mm which might be from namhyung@xxxxxxxxx are
linux-next.patch
mm-batch-free-pcp-list-if-possible.patch
select-remove-unused-max_select_seconds.patch
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