From f0c867d9588d9efc10d6a55009c9560336673369 Mon Sep 17 00:00:00 2001 From: yuzhoujian Date: Fri, 28 Dec 2018 00:36:10 -0800 Subject: mm, oom: add oom victim's memcg to the oom context information The current oom report doesn't display victim's memcg context during the global OOM situation. While this information is not strictly needed, it can be really helpful for containerized environments to locate which container has lost a process. Now that we have a single line for the oom context, we can trivially add both the oom memcg (this can be either global_oom or a specific memcg which hits its hard limits) and task_memcg which is the victim's memcg. Below is the single line output in the oom report after this patch. - global oom context information: oom-kill:constraint=,nodemask=,cpuset=,mems_allowed=,global_oom,task_memcg=,task=,pid=,uid= - memcg oom context information: oom-kill:constraint=,nodemask=,cpuset=,mems_allowed=,oom_memcg=,task_memcg=,task=,pid=,uid= [penguin-kernel@I-love.SAKURA.ne.jp: use pr_cont() in mem_cgroup_print_oom_context()] Link: http://lkml.kernel.org/r/201812190723.wBJ7NdkN032628@www262.sakura.ne.jp Link: http://lkml.kernel.org/r/1542799799-36184-2-git-send-email-ufo19890607@gmail.com Signed-off-by: yuzhoujian Signed-off-by: Tetsuo Handa Acked-by: Michal Hocko Cc: David Rientjes Cc: "Kirill A . Shutemov" Cc: Andrea Arcangeli Cc: Tetsuo Handa Cc: Roman Gushchin Cc: Yang Shi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/oom_kill.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'mm/oom_kill.c') diff --git a/mm/oom_kill.c b/mm/oom_kill.c index d90253f1ff93..5442cb12e4ed 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -435,6 +435,7 @@ static void dump_oom_summary(struct oom_control *oc, struct task_struct *victim) oom_constraint_text[oc->constraint], nodemask_pr_args(oc->nodemask)); cpuset_print_current_mems_allowed(); + mem_cgroup_print_oom_context(oc->memcg, victim); pr_cont(",task=%s,pid=%d,uid=%d\n", victim->comm, victim->pid, from_kuid(&init_user_ns, task_uid(victim))); } @@ -449,7 +450,7 @@ static void dump_header(struct oom_control *oc, struct task_struct *p) dump_stack(); if (is_memcg_oom(oc)) - mem_cgroup_print_oom_info(oc->memcg, p); + mem_cgroup_print_oom_meminfo(oc->memcg); else { show_mem(SHOW_MEM_FILTER_NODES, oc->nodemask); if (is_dump_unreclaim_slabs()) -- cgit v1.2.3