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[PATCH] drain_node_page(): Drain pages in batch units

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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>
This commit is contained in:
Christoph Lameter 2006-12-06 20:33:02 -08:00 committed by Linus Torvalds
parent ebe29738f3
commit bc4ba393c0
1 changed files with 8 additions and 2 deletions
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10
mm/page_alloc.c
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@ -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);
}
}