From: Roman Gushchin <guro@fb.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
David Rientjes <rientjes@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Tejun Heo <tj@kernel.org>, <kernel-team@fb.com>,
<cgroups@vger.kernel.org>, <linux-doc@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <linux-mm@kvack.org>
Subject: Re: [PATCH v13 5/7] mm, oom: add cgroup v2 mount option for cgroup-aware OOM killer
Date: Fri, 1 Dec 2017 17:00:09 +0000 [thread overview]
Message-ID: <20171201170004.GA27436@castle.DHCP.thefacebook.com> (raw)
In-Reply-To: <20171201133145.w4b4cekruklcgtol@dhcp22.suse.cz>
On Fri, Dec 01, 2017 at 02:31:45PM +0100, Michal Hocko wrote:
> On Fri 01-12-17 13:15:38, Roman Gushchin wrote:
> [...]
> > So, maybe we just need to return -EAGAIN (or may be -ENOTSUP) on any read/write
> > attempt if option is not enabled?
>
> Yes, that would work as well. ENOTSUP sounds better to me.
> --
> Michal Hocko
> SUSE Labs
>From 78bf2c00abf450bcd993d02a7dc1783144005fbd Mon Sep 17 00:00:00 2001
From: Roman Gushchin <guro@fb.com>
Date: Fri, 1 Dec 2017 14:30:14 +0000
Subject: [PATCH] mm, oom: return error on access to memory.oom_group if
groupoom is disabled
Cgroup-aware OOM killer depends on cgroup mount option and is turned
off by default, despite the user interface (memory.oom_group file) is
always present. As it might be confusing to a user, let's return
-ENOTSUPP on an attempt to access to memory.oom_group if groupoom is not
enabled globally.
Example:
$ cd /sys/fs/cgroup/user.slice/
$ cat memory.oom_group
cat: memory.oom_group: Unknown error 524
$ echo 1 > memory.oom_group
-bash: echo: write error: Unknown error 524
$ mount -o remount,groupoom /sys/fs/cgroup
$ echo 1 > memory.oom_group
$ cat memory.oom_group
1
Signed-off-by: Roman Gushchin <guro@fb.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: kernel-team@fb.com
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
---
mm/memcontrol.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c76d5fb55c5c..b709ee4f914b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5482,6 +5482,9 @@ static int memory_oom_group_show(struct seq_file *m, void *v)
struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
bool oom_group = memcg->oom_group;
+ if (!(cgrp_dfl_root.flags & CGRP_GROUP_OOM))
+ return -ENOTSUPP;
+
seq_printf(m, "%d\n", oom_group);
return 0;
@@ -5495,6 +5498,9 @@ static ssize_t memory_oom_group_write(struct kernfs_open_file *of,
int oom_group;
int err;
+ if (!(cgrp_dfl_root.flags & CGRP_GROUP_OOM))
+ return -ENOTSUPP;
+
err = kstrtoint(strstrip(buf), 0, &oom_group);
if (err)
return err;
--
2.14.3
next prev parent reply other threads:[~2017-12-01 17:00 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-30 15:28 [PATCH v13 0/7] cgroup-aware OOM killer Roman Gushchin
2017-11-30 15:28 ` [PATCH v13 1/7] mm, oom: refactor the oom_kill_process() function Roman Gushchin
2017-11-30 15:28 ` [PATCH v13 2/7] mm: implement mem_cgroup_scan_tasks() for the root memory cgroup Roman Gushchin
2017-11-30 15:28 ` [PATCH v13 3/7] mm, oom: cgroup-aware OOM killer Roman Gushchin
2017-12-01 8:35 ` Michal Hocko
2017-12-07 1:24 ` Andrew Morton
2017-12-07 13:39 ` Roman Gushchin
2017-11-30 15:28 ` [PATCH v13 4/7] mm, oom: introduce memory.oom_group Roman Gushchin
2017-11-30 15:28 ` [PATCH v13 5/7] mm, oom: add cgroup v2 mount option for cgroup-aware OOM killer Roman Gushchin
2017-12-01 8:41 ` Michal Hocko
2017-12-01 13:15 ` Roman Gushchin
2017-12-01 13:31 ` Michal Hocko
2017-12-01 17:00 ` Roman Gushchin [this message]
2017-11-30 15:28 ` [PATCH v13 6/7] mm, oom, docs: describe the " Roman Gushchin
2017-12-01 8:41 ` Michal Hocko
2017-12-01 17:01 ` Roman Gushchin
2017-12-01 17:13 ` Michal Hocko
2017-11-30 15:28 ` [PATCH v13 7/7] cgroup: list groupoom in cgroup features Roman Gushchin
2017-11-30 20:39 ` [PATCH v13 0/7] cgroup-aware OOM killer Andrew Morton
2018-01-10 0:57 ` David Rientjes
2018-01-10 13:11 ` Roman Gushchin
2018-01-10 19:33 ` Andrew Morton
2018-01-11 9:08 ` Michal Hocko
2018-01-11 13:18 ` Roman Gushchin
2018-01-12 22:03 ` David Rientjes
2018-01-15 11:54 ` Michal Hocko
2018-01-16 21:36 ` David Rientjes
2018-01-16 22:09 ` Michal Hocko
2018-01-11 21:57 ` David Rientjes
2018-01-13 17:14 ` Johannes Weiner
2018-01-14 23:44 ` David Rientjes
2018-01-15 16:25 ` Johannes Weiner
2018-01-16 21:21 ` David Rientjes
2018-01-10 20:50 ` David Rientjes
2017-12-01 9:14 ` [PATCH] mm, oom: simplify alloc_pages_before_oomkill handling Michal Hocko
2017-12-01 13:26 ` Tetsuo Handa
2017-12-01 13:32 ` Roman Gushchin
2017-12-01 13:54 ` Michal Hocko
2018-06-05 11:47 ` [PATCH v13 0/7] cgroup-aware OOM killer Michal Hocko
2018-06-05 12:13 ` Michal Hocko
2018-07-13 21:59 ` David Rientjes
2018-07-14 1:55 ` Tetsuo Handa
2018-07-16 21:13 ` Tetsuo Handa
2018-07-16 22:09 ` Roman Gushchin
2018-07-17 0:55 ` Tetsuo Handa
2018-07-31 14:14 ` Tetsuo Handa
2018-08-01 16:37 ` Roman Gushchin
2018-08-01 22:01 ` Tetsuo Handa
2018-08-01 22:55 ` Roman Gushchin
2018-07-16 9:36 ` Michal Hocko
2018-07-17 3:59 ` David Rientjes
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