3 files changed, 15 insertions, 11 deletions

diff --git a/include/linux/oom.h b/include/linux/oom.h
index d5771bed59c9..44b2f6f7bbd8 100644
--- a/include/linux/oom.h
+++ b/include/linux/oom.h
@@ -66,7 +66,8 @@ extern bool oom_zonelist_trylock(struct zonelist *zonelist, gfp_t gfp_flags);
 extern void oom_zonelist_unlock(struct zonelist *zonelist, gfp_t gfp_flags);
 
 extern void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
-                               int order, const nodemask_t *nodemask);
+                               int order, const nodemask_t *nodemask,
+                               struct mem_cgroup *memcg);
 
 extern enum oom_scan_t oom_scan_process_thread(struct task_struct *task,
                 unsigned long totalpages, const nodemask_t *nodemask,
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f227786e73db..c3f09b2dda5f 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1442,15 +1442,17 @@ void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
         struct mem_cgroup *iter;
         unsigned int i;
 
-        if (!p)
-                return;
-
         mutex_lock(&oom_info_lock);
         rcu_read_lock();
 
-        pr_info("Task in ");
-        pr_cont_cgroup_path(task_cgroup(p, memory_cgrp_id));
-        pr_cont(" killed as a result of limit of ");
+        if (p) {
+                pr_info("Task in ");
+                pr_cont_cgroup_path(task_cgroup(p, memory_cgrp_id));
+                pr_cont(" killed as a result of limit of ");
+        } else {
+                pr_info("Memory limit reached of cgroup ");
+        }
+
         pr_cont_cgroup_path(memcg->css.cgroup);
         pr_cont("\n");
 
@@ -1537,7 +1539,7 @@ static void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
                 return;
         }
 
-        check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, order, NULL);
+        check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, order, NULL, memcg);
         totalpages = mem_cgroup_get_limit(memcg) ? : 1;
         for_each_mem_cgroup_tree(iter, memcg) {
                 struct css_task_iter it;
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 642f38cb175a..52628c819bf7 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -612,7 +612,8 @@ void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
  * Determines whether the kernel must panic because of the panic_on_oom sysctl.
  */
 void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
-                        int order, const nodemask_t *nodemask)
+                        int order, const nodemask_t *nodemask,
+                        struct mem_cgroup *memcg)
 {
         if (likely(!sysctl_panic_on_oom))
                 return;
@@ -625,7 +626,7 @@ void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
                 if (constraint != CONSTRAINT_NONE)
                         return;
         }
-        dump_header(NULL, gfp_mask, order, NULL, nodemask);
+        dump_header(NULL, gfp_mask, order, memcg, nodemask);
         panic("Out of memory: %s panic_on_oom is enabled\n",
                 sysctl_panic_on_oom == 2 ? "compulsory" : "system-wide");
 }
@@ -740,7 +741,7 @@ static void __out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
         constraint = constrained_alloc(zonelist, gfp_mask, nodemask,
                                                 &totalpages);
         mpol_mask = (constraint == CONSTRAINT_MEMORY_POLICY) ? nodemask : NULL;
-        check_panic_on_oom(constraint, gfp_mask, order, mpol_mask);
+        check_panic_on_oom(constraint, gfp_mask, order, mpol_mask, NULL);
 
         if (sysctl_oom_kill_allocating_task && current->mm &&
             !oom_unkillable_task(current, NULL, nodemask) &&