If a cgroup has no associated tasks, invoking the OOM killer won't help release any memory, so respecting the memory.min can lead to an infinite OOM loop or system stall.
Let's ignore memory.min of unpopulated cgroups. Signed-off-by: Roman Gushchin <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Vladimir Davydov <[email protected]> Cc: Tejun Heo <[email protected]> Acked-by: Johannes Weiner <[email protected]> --- mm/vmscan.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 50055d72f294..709237feddc1 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2549,8 +2549,11 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc) /* * Hard protection. * If there is no reclaimable memory, OOM. + * Abandoned cgroups are loosing protection, + * because OOM killer won't release any memory. */ - continue; + if (cgroup_is_populated(memcg->css.cgroup)) + continue; case MEMCG_PROT_LOW: /* * Soft protection. -- 2.14.3
