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authorBalasubramani Vivekanandan <balu252@gmail.com>2015-04-14 15:48:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-14 16:49:05 -0700
commit2415b9f5cb048a803b30b790af994ba71ff0bd4c (patch)
tree616a11b2a493045bee0c5e963ccdfc00c9d64d7c
parent2a8e70026435ad97570a1e0a0c4c941e0f700a3e (diff)
downloadop-kernel-dev-2415b9f5cb048a803b30b790af994ba71ff0bd4c.zip
op-kernel-dev-2415b9f5cb048a803b30b790af994ba71ff0bd4c.tar.gz
memcg: print cgroup information when system panics due to panic_on_oom
If kernel panics due to oom, caused by a cgroup reaching its limit, when 'compulsory panic_on_oom' is enabled, then we will only see that the OOM happened because of "compulsory panic_on_oom is enabled" but this doesn't tell the difference between mempolicy and memcg. And dumping system wide information is plain wrong and more confusing. This patch provides the information of the cgroup whose limit triggerred panic Signed-off-by: Balasubramani Vivekanandan <balasubramani_vivekanandan@mentor.com> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/oom.h3
-rw-r--r--mm/memcontrol.c16
-rw-r--r--mm/oom_kill.c7
3 files changed, 15 insertions, 11 deletions
diff --git a/include/linux/oom.h b/include/linux/oom.h
index d5771bed..44b2f6f 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 f227786..c3f09b2 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 642f38c..52628c8 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) &&
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