From: Roman Gushchin <guro@fb.com>
To: linux-mm@kvack.org
Cc: Roman Gushchin <guro@fb.com>, Tejun Heo <tj@kernel.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Li Zefan <lizefan@huawei.com>, Michal Hocko <mhocko@kernel.org>,
Vladimir Davydov <vdavydov.dev@gmail.com>,
Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
kernel-team@fb.com, cgroups@vger.kernel.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [v3 3/6] mm, oom: cgroup-aware OOM killer debug info
Date: Wed, 21 Jun 2017 22:19:13 +0100 [thread overview]
Message-ID: <1498079956-24467-4-git-send-email-guro@fb.com> (raw)
In-Reply-To: <1498079956-24467-1-git-send-email-guro@fb.com>
Dump the cgroup oom badness score, as well as the name
of chosen victim cgroup.
Here how it looks like in dmesg:
[ 18.824495] Choosing a victim memcg because of the system-wide OOM
[ 18.826911] Cgroup /A1: 200805
[ 18.827996] Cgroup /A2: 273072
[ 18.828937] Cgroup /A2/B3: 51
[ 18.829795] Cgroup /A2/B4: 272969
[ 18.830800] Cgroup /A2/B5: 52
[ 18.831890] Chosen cgroup /A2/B4: 272969
Signed-off-by: Roman Gushchin <guro@fb.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: kernel-team@fb.com
Cc: cgroups@vger.kernel.org
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org
---
mm/memcontrol.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index bdb5103..4face20 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2669,7 +2669,15 @@ bool mem_cgroup_select_oom_victim(struct oom_control *oc)
if (!cgroup_subsys_on_dfl(memory_cgrp_subsys))
return false;
+
+ pr_info("Choosing a victim memcg because of the %s",
+ oc->memcg ?
+ "memory limit reached of cgroup " :
+ "system-wide OOM\n");
if (oc->memcg) {
+ pr_cont_cgroup_path(oc->memcg->css.cgroup);
+ pr_cont("\n");
+
chosen_memcg = oc->memcg;
parent = oc->memcg;
}
@@ -2683,6 +2691,10 @@ bool mem_cgroup_select_oom_victim(struct oom_control *oc)
points = mem_cgroup_oom_badness(iter, oc->nodemask);
+ pr_info("Cgroup ");
+ pr_cont_cgroup_path(iter->css.cgroup);
+ pr_cont(": %ld\n", points);
+
if (points > chosen_memcg_points) {
chosen_memcg = iter;
chosen_memcg_points = points;
@@ -2731,6 +2743,10 @@ bool mem_cgroup_select_oom_victim(struct oom_control *oc)
oc->chosen_memcg = chosen_memcg;
}
+ pr_info("Chosen cgroup ");
+ pr_cont_cgroup_path(chosen_memcg->css.cgroup);
+ pr_cont(": %ld\n", oc->chosen_points);
+
/*
* Even if we have to kill all tasks in the cgroup,
* we need to select the biggest task to start with.
@@ -2739,7 +2755,9 @@ bool mem_cgroup_select_oom_victim(struct oom_control *oc)
*/
oc->chosen_points = 0;
mem_cgroup_scan_tasks(chosen_memcg, oom_evaluate_task, oc);
- }
+ } else if (oc->chosen)
+ pr_info("Chosen task %s (%d) in root cgroup: %ld\n",
+ oc->chosen->comm, oc->chosen->pid, oc->chosen_points);
rcu_read_unlock();
--
2.7.4
--
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next prev parent reply other threads:[~2017-06-21 21:20 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-21 21:19 [v3 0/6] cgroup-aware OOM killer Roman Gushchin
2017-06-21 21:19 ` [v3 1/6] mm, oom: use oom_victims counter to synchronize oom victim selection Roman Gushchin
[not found] ` <201706220040.v5M0eSnK074332@www262.sakura.ne.jp>
2017-06-22 16:58 ` Roman Gushchin
2017-06-22 20:37 ` Tetsuo Handa
[not found] ` <201706230537.IDB21366.SQHJVFOOFOMFLt-JPay3/Yim36HaxMnTkn67Xf5DAMn2ifp@public.gmane.org>
2017-06-22 21:52 ` Tetsuo Handa
2017-06-29 18:47 ` Roman Gushchin
2017-06-29 20:13 ` Tetsuo Handa
2017-06-29 9:04 ` Michal Hocko
2017-06-21 21:19 ` [v3 2/6] mm, oom: cgroup-aware OOM killer Roman Gushchin
2017-07-10 23:05 ` David Rientjes
2017-07-11 12:51 ` Roman Gushchin
2017-07-11 20:56 ` David Rientjes
2017-07-12 12:11 ` Roman Gushchin
2017-07-12 20:26 ` David Rientjes
2017-06-21 21:19 ` Roman Gushchin [this message]
2017-06-21 21:19 ` [v3 4/6] mm, oom: introduce oom_score_adj for memory cgroups Roman Gushchin
2017-06-21 21:19 ` [v3 5/6] mm, oom: don't mark all oom victims tasks with TIF_MEMDIE Roman Gushchin
2017-06-29 8:53 ` Michal Hocko
2017-06-29 18:45 ` Roman Gushchin
2017-06-30 8:25 ` Michal Hocko
2017-06-21 21:19 ` [v3 6/6] mm,oom,docs: describe the cgroup-aware OOM killer Roman Gushchin
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