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[PATCH] zone reclaim: do not check references to a page during zone reclaim

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shrink_list() and refill_inactive() check all ptes pointing to a page for
reference bits in order to decide if the page should be put on the active
list.  This is not necessary for zone_reclaim since we are only interested
in removing unmapped pages.  Skip the checks in both functions.

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 2006-02-11 17:55:53 -08:00 committed by Linus Torvalds
parent 643a654540
commit 80e4342601
1 changed files with 5 additions and 1 deletions
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6
mm/vmscan.c
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@ -443,6 +443,10 @@ static int shrink_list(struct list_head *page_list, struct scan_control *sc)
BUG_ON(PageActive(page));
sc->nr_scanned++;
if (!sc->may_swap && page_mapped(page))
goto keep_locked;
/* Double the slab pressure for mapped and swapcache pages */
if (page_mapped(page) || PageSwapCache(page))
sc->nr_scanned++;
@ -1231,7 +1235,7 @@ refill_inactive_zone(struct zone *zone, struct scan_control *sc)
* Now use this metric to decide whether to start moving mapped memory
* onto the inactive list.
*/
if (swap_tendency >= 100)
if (swap_tendency >= 100 && sc->may_swap)
reclaim_mapped = 1;
while (!list_empty(&l_hold)) {