mm: vmscan: fix do_try_to_free_pages() livelock

This patch is based on KOSAKI's work and I add a little more description,
please refer https://lkml.org/lkml/2012/6/14/74.

Currently, I found system can enter a state that there are lots of free
pages in a zone but only order-0 and order-1 pages which means the zone is
heavily fragmented, then high order allocation could make direct reclaim
path's long stall(ex, 60 seconds) especially in no swap and no compaciton
enviroment.  This problem happened on v3.4, but it seems issue still lives
in current tree, the reason is do_try_to_free_pages enter live lock:

kswapd will go to sleep if the zones have been fully scanned and are still
not balanced.  As kswapd thinks there's little point trying all over again
to avoid infinite loop.  Instead it changes order from high-order to
0-order because kswapd think order-0 is the most important.  Look at
73ce02e9 in detail.  If watermarks are ok, kswapd will go back to sleep
and may leave zone->all_unreclaimable =3D 0.  It assume high-order users
can still perform direct reclaim if they wish.

Direct reclaim continue to reclaim for a high order which is not a
COSTLY_ORDER without oom-killer until kswapd turn on
zone->all_unreclaimble= .  This is because to avoid too early oom-kill.
So it means direct_reclaim depends on kswapd to break this loop.

In worst case, direct-reclaim may continue to page reclaim forever when
kswapd sleeps forever until someone like watchdog detect and finally kill
the process.  As described in:
http://thread.gmane.org/gmane.linux.kernel.mm/103737

We can't turn on zone->all_unreclaimable from direct reclaim path because
direct reclaim path don't take any lock and this way is racy.  Thus this
patch removes zone->all_unreclaimable field completely and recalculates
zone reclaimable state every time.

Note: we can't take the idea that direct-reclaim see zone->pages_scanned
directly and kswapd continue to use zone->all_unreclaimable.  Because, it
is racy.  commit 929bea7c71 (vmscan: all_unreclaimable() use
zone->all_unreclaimable as a name) describes the detail.

[akpm@linux-foundation.org: uninline zone_reclaimable_pages() and zone_reclaimable()]
Cc: Aaditya Kumar <aaditya.kumar.30@gmail.com>
Cc: Ying Han <yinghan@google.com>
Cc: Nick Piggin <npiggin@gmail.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Bob Liu <lliubbo@gmail.com>
Cc: Neil Zhang <zhangwm@marvell.com>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Minchan Kim <minchan@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Lisa Du <cldu@marvell.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 31 insertions, 35 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 44c072a7cba2..fe715daeb8bc 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -146,6 +146,25 @@ static bool global_reclaim(struct scan_control *sc)
 }
 #endif
 
+unsigned long zone_reclaimable_pages(struct zone *zone)
+{
+	int nr;
+
+	nr = zone_page_state(zone, NR_ACTIVE_FILE) +
+	     zone_page_state(zone, NR_INACTIVE_FILE);
+
+	if (get_nr_swap_pages() > 0)
+		nr += zone_page_state(zone, NR_ACTIVE_ANON) +
+		      zone_page_state(zone, NR_INACTIVE_ANON);
+
+	return nr;
+}
+
+bool zone_reclaimable(struct zone *zone)
+{
+	return zone->pages_scanned < zone_reclaimable_pages(zone) * 6;
+}
+
 static unsigned long get_lru_size(struct lruvec *lruvec, enum lru_list lru)
 {
 	if (!mem_cgroup_disabled())
@@ -1789,7 +1808,7 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
 	 * latencies, so it's better to scan a minimum amount there as
 	 * well.
 	 */
-	if (current_is_kswapd() && zone->all_unreclaimable)
+	if (current_is_kswapd() && !zone_reclaimable(zone))
 		force_scan = true;
 	if (!global_reclaim(sc))
 		force_scan = true;
@@ -2244,8 +2263,8 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
 		if (global_reclaim(sc)) {
 			if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
 				continue;
-			if (zone->all_unreclaimable &&
-					sc->priority != DEF_PRIORITY)
+			if (sc->priority != DEF_PRIORITY &&
+			    !zone_reclaimable(zone))
 				continue;	/* Let kswapd poll it */
 			if (IS_ENABLED(CONFIG_COMPACTION)) {
 				/*
@@ -2283,11 +2302,6 @@ static bool shrink_zones(struct zonelist *zonelist, struct scan_control *sc)
 	return aborted_reclaim;
 }
 
-static bool zone_reclaimable(struct zone *zone)
-{
-	return zone->pages_scanned < zone_reclaimable_pages(zone) * 6;
-}
-
 /* All zones in zonelist are unreclaimable? */
 static bool all_unreclaimable(struct zonelist *zonelist,
 		struct scan_control *sc)
@@ -2301,7 +2315,7 @@ static bool all_unreclaimable(struct zonelist *zonelist,
 			continue;
 		if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
 			continue;
-		if (!zone->all_unreclaimable)
+		if (zone_reclaimable(zone))
 			return false;
 	}
 
@@ -2712,7 +2726,7 @@ static bool pgdat_balanced(pg_data_t *pgdat, int order, int classzone_idx)
 		 * DEF_PRIORITY. Effectively, it considers them balanced so
 		 * they must be considered balanced here as well!
 		 */
-		if (zone->all_unreclaimable) {
+		if (!zone_reclaimable(zone)) {
 			balanced_pages += zone->managed_pages;
 			continue;
 		}
@@ -2773,7 +2787,6 @@ static bool kswapd_shrink_zone(struct zone *zone,
 			       unsigned long lru_pages,
 			       unsigned long *nr_attempted)
 {
-	unsigned long nr_slab;
 	int testorder = sc->order;
 	unsigned long balance_gap;
 	struct reclaim_state *reclaim_state = current->reclaim_state;
@@ -2818,15 +2831,12 @@ static bool kswapd_shrink_zone(struct zone *zone,
 	shrink_zone(zone, sc);
 
 	reclaim_state->reclaimed_slab = 0;
-	nr_slab = shrink_slab(&shrink, sc->nr_scanned, lru_pages);
+	shrink_slab(&shrink, sc->nr_scanned, lru_pages);
 	sc->nr_reclaimed += reclaim_state->reclaimed_slab;
 
 	/* Account for the number of pages attempted to reclaim */
 	*nr_attempted += sc->nr_to_reclaim;
 
-	if (nr_slab == 0 && !zone_reclaimable(zone))
-		zone->all_unreclaimable = 1;
-
 	zone_clear_flag(zone, ZONE_WRITEBACK);
 
 	/*
@@ -2835,7 +2845,7 @@ static bool kswapd_shrink_zone(struct zone *zone,
 	 * BDIs but as pressure is relieved, speculatively avoid congestion
 	 * waits.
 	 */
-	if (!zone->all_unreclaimable &&
+	if (zone_reclaimable(zone) &&
 	    zone_balanced(zone, testorder, 0, classzone_idx)) {
 		zone_clear_flag(zone, ZONE_CONGESTED);
 		zone_clear_flag(zone, ZONE_TAIL_LRU_DIRTY);
@@ -2901,8 +2911,8 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order,
 			if (!populated_zone(zone))
 				continue;
 
-			if (zone->all_unreclaimable &&
-			    sc.priority != DEF_PRIORITY)
+			if (sc.priority != DEF_PRIORITY &&
+			    !zone_reclaimable(zone))
 				continue;
 
 			/*
@@ -2980,8 +2990,8 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order,
 			if (!populated_zone(zone))
 				continue;
 
-			if (zone->all_unreclaimable &&
-			    sc.priority != DEF_PRIORITY)
+			if (sc.priority != DEF_PRIORITY &&
+			    !zone_reclaimable(zone))
 				continue;
 
 			sc.nr_scanned = 0;
@@ -3265,20 +3275,6 @@ unsigned long global_reclaimable_pages(void)
 	return nr;
 }
 
-unsigned long zone_reclaimable_pages(struct zone *zone)
-{
-	int nr;
-
-	nr = zone_page_state(zone, NR_ACTIVE_FILE) +
-	     zone_page_state(zone, NR_INACTIVE_FILE);
-
-	if (get_nr_swap_pages() > 0)
-		nr += zone_page_state(zone, NR_ACTIVE_ANON) +
-		      zone_page_state(zone, NR_INACTIVE_ANON);
-
-	return nr;
-}
-
 #ifdef CONFIG_HIBERNATION
 /*
  * Try to free `nr_to_reclaim' of memory, system-wide, and return the number of
@@ -3576,7 +3572,7 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
 	    zone_page_state(zone, NR_SLAB_RECLAIMABLE) <= zone->min_slab_pages)
 		return ZONE_RECLAIM_FULL;
 
-	if (zone->all_unreclaimable)
+	if (!zone_reclaimable(zone))
 		return ZONE_RECLAIM_FULL;
 
 	/*