[PATCH] drain_node_page(): Drain pages in batch units
drain_node_pages() currently drains the complete pageset of all pages. If
there are a large number of pages in the queues then we may hold off
interrupts for too long.
Duplicate the method used in free_hot_cold_page. Only drain pcp->batch
pages at one time.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a840e70..86f2984 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -685,9 +685,15 @@
pcp = &pset->pcp[i];
if (pcp->count) {
+ int to_drain;
+
local_irq_save(flags);
- free_pages_bulk(zone, pcp->count, &pcp->list, 0);
- pcp->count = 0;
+ if (pcp->count >= pcp->batch)
+ to_drain = pcp->batch;
+ else
+ to_drain = pcp->count;
+ free_pages_bulk(zone, to_drain, &pcp->list, 0);
+ pcp->count -= to_drain;
local_irq_restore(flags);
}
}