From 0aeb2339e54e40d0788a7017ecaeac7f5271e262 Mon Sep 17 00:00:00 2001 From: Johannes Weiner Date: Mon, 24 May 2010 14:32:40 -0700 Subject: [PATCH] vmscan: remove all_unreclaimable scan control This scan control is abused to communicate a return value from shrink_zones(). Write this idiomatically and remove the knob. Signed-off-by: Johannes Weiner Reviewed-by: KOSAKI Motohiro Cc: Mel Gorman Cc: Rik van Riel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/vmscan.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index cd4a5edf5be2..c55763ee8312 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -73,8 +73,6 @@ struct scan_control { int swappiness; - int all_unreclaimable; - int order; /* @@ -1716,14 +1714,14 @@ static void shrink_zone(int priority, struct zone *zone, * If a zone is deemed to be full of pinned pages then just give it a light * scan then give up on it. */ -static void shrink_zones(int priority, struct zonelist *zonelist, +static int shrink_zones(int priority, struct zonelist *zonelist, struct scan_control *sc) { enum zone_type high_zoneidx = gfp_zone(sc->gfp_mask); struct zoneref *z; struct zone *zone; + int progress = 0; - sc->all_unreclaimable = 1; for_each_zone_zonelist_nodemask(zone, z, zonelist, high_zoneidx, sc->nodemask) { if (!populated_zone(zone)) @@ -1739,19 +1737,19 @@ static void shrink_zones(int priority, struct zonelist *zonelist, if (zone->all_unreclaimable && priority != DEF_PRIORITY) continue; /* Let kswapd poll it */ - sc->all_unreclaimable = 0; } else { /* * Ignore cpuset limitation here. We just want to reduce * # of used pages by us regardless of memory shortage. */ - sc->all_unreclaimable = 0; mem_cgroup_note_reclaim_priority(sc->mem_cgroup, priority); } shrink_zone(priority, zone, sc); + progress = 1; } + return progress; } /* @@ -1805,7 +1803,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist, sc->nr_scanned = 0; if (!priority) disable_swap_token(); - shrink_zones(priority, zonelist, sc); + ret = shrink_zones(priority, zonelist, sc); /* * Don't shrink slabs when reclaiming memory from * over limit cgroups @@ -1842,7 +1840,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist, congestion_wait(BLK_RW_ASYNC, HZ/10); } /* top priority shrink_zones still had more to do? don't OOM, then */ - if (!sc->all_unreclaimable && scanning_global_lru(sc)) + if (ret && scanning_global_lru(sc)) ret = sc->nr_reclaimed; out: /* -- 2.20.1