linux-kernel - [PATCH v4 2/2] memcg: add oom_kill

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230517032032.76334-3-chengkaitao@didiglobal.com>
Date:   Wed, 17 May 2023 11:20:32 +0800
From:   chengkaitao <chengkaitao@...iglobal.com>
To:     <tj@...nel.org>, <lizefan.x@...edance.com>, <hannes@...xchg.org>,
        <corbet@....net>, <mhocko@...nel.org>, <roman.gushchin@...ux.dev>,
        <shakeelb@...gle.com>, <akpm@...ux-foundation.org>,
        <brauner@...nel.org>, <muchun.song@...ux.dev>
CC:     <viro@...iv.linux.org.uk>, <zhengqi.arch@...edance.com>,
        <ebiederm@...ssion.com>, <Liam.Howlett@...cle.com>,
        <chengzhihao1@...wei.com>, <pilgrimtao@...il.com>,
        <haolee.swjtu@...il.com>, <yuzhao@...gle.com>,
        <willy@...radead.org>, <vasily.averin@...ux.dev>, <vbabka@...e.cz>,
        <surenb@...gle.com>, <sfr@...b.auug.org.au>, <mcgrof@...nel.org>,
        <sujiaxun@...ontech.com>, <feng.tang@...el.com>,
        <cgroups@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-mm@...ck.org>
Subject: [PATCH v4 2/2] memcg: add oom_kill_inherit event indicator

From: chengkaitao <pilgrimtao@...il.com>

Oom_kill_inherit can reflect the number of child cgroups selected by
the parent cgroup's OOM killer. We can refer to the proportion of the
indicator to adjust the value of oom_protect. The larger oom_protect,
the smaller oom_kill_inherit.

Signed-off-by: chengkaitao <pilgrimtao@...il.com>
---
 Documentation/admin-guide/cgroup-v2.rst | 4 ++++
 include/linux/memcontrol.h              | 1 +
 mm/memcontrol.c                         | 6 ++++++
 3 files changed, 11 insertions(+)

diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index 51e9a84d508a..e6f56443d049 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -1358,6 +1358,10 @@ PAGE_SIZE multiple when read back.
 		The number of processes belonging to this cgroup
 		killed by any kind of OOM killer.
 
+	  oom_kill_inherit
+		The number of processes belonging to this cgroup
+		killed by all Ancestral memcg's OOM killer.
+
           oom_group_kill
                 The number of times a group OOM has occurred.
 
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 23ea28d98c0e..d7797f9a0605 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -46,6 +46,7 @@ enum memcg_memory_event {
 	MEMCG_MAX,
 	MEMCG_OOM,
 	MEMCG_OOM_KILL,
+	MEMCG_OOM_INHERIT,
 	MEMCG_OOM_GROUP_KILL,
 	MEMCG_SWAP_HIGH,
 	MEMCG_SWAP_MAX,
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 8ee67abb415f..cf3cacf26cec 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2129,6 +2129,10 @@ struct mem_cgroup *mem_cgroup_get_oom_group(struct task_struct *victim,
 
 		if (memcg == oom_domain)
 			break;
+		/* we use oom.group's logic to update the OOM_INHERIT indicator,
+		 * but OOM_INHERIT and oom.group are independent of each other.
+		 */
+		memcg_memory_event(memcg, MEMCG_OOM_INHERIT);
 	}
 
 	if (oom_group)
@@ -6622,6 +6626,8 @@ static void __memory_events_show(struct seq_file *m, atomic_long_t *events)
 	seq_printf(m, "oom %lu\n", atomic_long_read(&events[MEMCG_OOM]));
 	seq_printf(m, "oom_kill %lu\n",
 		   atomic_long_read(&events[MEMCG_OOM_KILL]));
+	seq_printf(m, "oom_kill_inherit %lu\n",
+		   atomic_long_read(&events[MEMCG_OOM_INHERIT]));
 	seq_printf(m, "oom_group_kill %lu\n",
 		   atomic_long_read(&events[MEMCG_OOM_GROUP_KILL]));
 }
-- 
2.14.1