vmscan: fix do_try_to_free_pages() return value when priority==0 reclaim failure

Greg Thelen reported recent Johannes's stack diet patch makes kernel hang.
 His test is following.

  mount -t cgroup none /cgroups -o memory
  mkdir /cgroups/cg1
  echo $$ > /cgroups/cg1/tasks
  dd bs=1024 count=1024 if=/dev/null of=/data/foo
  echo $$ > /cgroups/tasks
  echo 1 > /cgroups/cg1/memory.force_empty

Actually, This OOM hard to try logic have been corrupted since following
two years old patch.

	commit a41f24ea9fd6169b147c53c2392e2887cc1d9247
	Author: Nishanth Aravamudan <nacc@us.ibm.com>
	Date:   Tue Apr 29 00:58:25 2008 -0700

	    page allocator: smarter retry of costly-order allocations

Original intention was "return success if the system have shrinkable zones
though priority==0 reclaim was failure".  But the above patch changed to
"return nr_reclaimed if .....".  Oh, That forgot nr_reclaimed may be 0 if
priority==0 reclaim failure.

And Johannes's patch 0aeb2339e54e ("vmscan: remove all_unreclaimable scan
control") made it more corrupt.  Originally, priority==0 reclaim failure
on memcg return 0, but this patch changed to return 1.  It totally
confused memcg.

This patch fixes it completely.

Reported-by: Greg Thelen <gthelen@google.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Tested-by: Greg Thelen <gthelen@google.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 16 insertions, 13 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 915dceb487c1..9c7e57cc63a3 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1724,13 +1724,13 @@ 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 int shrink_zones(int priority, struct zonelist *zonelist,
+static bool 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;
+        bool all_unreclaimable = true;
 
         for_each_zone_zonelist_nodemask(zone, z, zonelist, high_zoneidx,
                                         sc->nodemask) {
@@ -1757,9 +1757,9 @@ static int shrink_zones(int priority, struct zonelist *zonelist,
                 }
 
                 shrink_zone(priority, zone, sc);
-                progress = 1;
+                all_unreclaimable = false;
         }
-        return progress;
+        return all_unreclaimable;
 }
 
 /*
@@ -1782,7 +1782,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
                                         struct scan_control *sc)
 {
         int priority;
-        unsigned long ret = 0;
+        bool all_unreclaimable;
         unsigned long total_scanned = 0;
         struct reclaim_state *reclaim_state = current->reclaim_state;
         unsigned long lru_pages = 0;
@@ -1813,7 +1813,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
                 sc->nr_scanned = 0;
                 if (!priority)
                         disable_swap_token();
-                ret = shrink_zones(priority, zonelist, sc);
+                all_unreclaimable = shrink_zones(priority, zonelist, sc);
                 /*
                  * Don't shrink slabs when reclaiming memory from
                  * over limit cgroups
@@ -1826,10 +1826,8 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
                         }
                 }
                 total_scanned += sc->nr_scanned;
-                if (sc->nr_reclaimed >= sc->nr_to_reclaim) {
-                        ret = sc->nr_reclaimed;
+                if (sc->nr_reclaimed >= sc->nr_to_reclaim)
                         goto out;
-                }
 
                 /*
                  * Try to write back as many pages as we just scanned.  This
@@ -1849,9 +1847,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
                     priority < DEF_PRIORITY - 2)
                         congestion_wait(BLK_RW_ASYNC, HZ/10);
         }
-        /* top priority shrink_zones still had more to do? don't OOM, then */
-        if (ret && scanning_global_lru(sc))
-                ret = sc->nr_reclaimed;
+
 out:
         /*
          * Now that we've scanned all the zones at this priority level, note
@@ -1877,7 +1873,14 @@ out:
         delayacct_freepages_end();
         put_mems_allowed();
 
-        return ret;
+        if (sc->nr_reclaimed)
+                return sc->nr_reclaimed;
+
+        /* top priority shrink_zones still had more to do? don't OOM, then */
+        if (scanning_global_lru(sc) && !all_unreclaimable)
+                return 1;
+
+        return 0;
 }
 
 unsigned long try_to_free_pages(struct zonelist *zonelist, int order,