From: Christoph Lameter Date: Sun, 12 Feb 2006 01:55:53 +0000 (-0800) Subject: [PATCH] zone reclaim: do not check references to a page during zone reclaim X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=80e4342601abfafacb5f20571e40b56d73d10819;p=openwrt%2Fstaging%2Fblogic.git [PATCH] zone reclaim: do not check references to a page during zone reclaim 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/vmscan.c b/mm/vmscan.c index 5db32fdfaf39..e1c64230ffdd 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -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)) {