Check zone->all_unreclaimable in all_unreclaimable(), otherwise the
kernel may hang up, because shrink_zones() will do nothing, but
all_unreclaimable() will say, that zone has reclaimable pages.
do_try_to_free_pages()
shrink_zones()
for_each_zone
if (zone->all_unreclaimable)
continue
if !all_unreclaimable(zonelist, sc)
return 1
__alloc_pages_slowpath()
retry:
did_some_progress = do_try_to_free_pages(page)
...
if (!page && did_some_progress)
retry;
Signed-off-by: Andrey Vagin <avagin@xxxxxxxxxx>
---
mm/vmscan.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 6771ea7..1c056f7 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2002,6 +2002,8 @@ static bool all_unreclaimable(struct zonelist *zonelist,
for_each_zone_zonelist_nodemask(zone, z, zonelist,
gfp_zone(sc->gfp_mask), sc->nodemask) {
+ if (zone->all_unreclaimable)
+ continue;
if (!populated_zone(zone))
continue;
if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
--
1.7.1
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