Commit bc4ba393 authored Dec 06, 2006 by Christoph Lameter Committed by Linus Torvalds Dec 07, 2006

[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>

parent ebe29738

mm/page_alloc.c

+8 −2

Original line number	Diff line number	Diff line
		@@ -685,9 +685,15 @@ void drain_node_pages(int nodeid)

		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);
		}
		}