mm, memcg: pass charge order to oom killer

The oom killer typically displays the allocation order at the time of oom
as a part of its diangostic messages (for global, cpuset, and mempolicy
ooms).

The memory controller may also pass the charge order to the oom killer so
it can emit the same information.  This is useful in determining how large
the memory allocation is that triggered the oom killer.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Balbir Singh <bsingharora@gmail.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 7 insertions, 6 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 37281816ff67..bb04067269bc 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1811,7 +1811,7 @@ static void memcg_oom_recover(struct mem_cgroup *memcg)
 /*
  * try to call OOM killer. returns false if we should exit memory-reclaim loop.
  */
-bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask)
+bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask, int order)
 {
         struct oom_wait_info owait;
         bool locked, need_to_kill;
@@ -1841,7 +1841,7 @@ bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask)
 
         if (need_to_kill) {
                 finish_wait(&memcg_oom_waitq, &owait.wait);
-                mem_cgroup_out_of_memory(memcg, mask);
+                mem_cgroup_out_of_memory(memcg, mask, order);
         } else {
                 schedule();
                 finish_wait(&memcg_oom_waitq, &owait.wait);
@@ -2212,7 +2212,7 @@ static int mem_cgroup_do_charge(struct mem_cgroup *memcg, gfp_t gfp_mask,
         if (!oom_check)
                 return CHARGE_NOMEM;
         /* check OOM */
-        if (!mem_cgroup_handle_oom(mem_over_limit, gfp_mask))
+        if (!mem_cgroup_handle_oom(mem_over_limit, gfp_mask, get_order(csize)))
                 return CHARGE_OOM_DIE;
 
         return CHARGE_RETRY;
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index f23f33454645..4198e000f41a 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -554,7 +554,8 @@ static void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask,
 }
 
 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
-void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask)
+void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
+                              int order)
 {
         unsigned long limit;
         unsigned int points = 0;
@@ -570,12 +571,12 @@ void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask)
                 return;
         }
 
-        check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, 0, NULL);
+        check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, order, NULL);
         limit = mem_cgroup_get_limit(memcg) >> PAGE_SHIFT;
         read_lock(&tasklist_lock);
         p = select_bad_process(&points, limit, memcg, NULL, false);
         if (p && PTR_ERR(p) != -1UL)
-                oom_kill_process(p, gfp_mask, 0, points, limit, memcg, NULL,
+                oom_kill_process(p, gfp_mask, order, points, limit, memcg, NULL,
                                  "Memory cgroup out of memory");
         read_unlock(&tasklist_lock);
 }