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From: Mina Almasry <almasrymina@google.com>
To: unlisted-recipients:; (no To-header on input)
Cc: Mina Almasry <almasrymina@google.com>,
	Michal Hocko <mhocko@suse.com>, "Theodore Ts'o" <tytso@mit.edu>,
	Greg Thelen <gthelen@google.com>,
	Shakeel Butt <shakeelb@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Hugh Dickins <hughd@google.com>, Roman Gushchin <guro@fb.com>,
	Johannes Weiner <hannes@cmpxchg.org>, Tejun Heo <tj@kernel.org>,
	Vladimir Davydov <vdavydov.dev@gmail.com>,
	Muchun Song <songmuchun@bytedance.com>,
	riel@surriel.com, linux-mm@kvack.org,
	linux-fsdevel@vger.kernel.org, cgroups@vger.kernel.org
Subject: [PATCH v3 3/4] mm, shmem: add tmpfs memcg= option documentation
Date: Thu, 11 Nov 2021 15:42:02 -0800	[thread overview]
Message-ID: <20211111234203.1824138-4-almasrymina@google.com> (raw)
In-Reply-To: <20211111234203.1824138-1-almasrymina@google.com>

Signed-off-by: Mina Almasry <almasrymina@google.com>

Cc: Michal Hocko <mhocko@suse.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Greg Thelen <gthelen@google.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: riel@surriel.com
Cc: linux-mm@kvack.org
Cc: linux-fsdevel@vger.kernel.org
Cc: cgroups@vger.kernel.org

---
 Documentation/filesystems/tmpfs.rst | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/filesystems/tmpfs.rst b/Documentation/filesystems/tmpfs.rst
index 0408c245785e3..1ab04e8fa9222 100644
--- a/Documentation/filesystems/tmpfs.rst
+++ b/Documentation/filesystems/tmpfs.rst
@@ -137,6 +137,23 @@ mount options.  It can be added later, when the tmpfs is already mounted
 on MountPoint, by 'mount -o remount,mpol=Policy:NodeList MountPoint'.


+If CONFIG_MEMCG is enabled, tmpfs has a mount option to specify the memory
+cgroup to be charged for page allocations.
+
+memcg=/sys/fs/cgroup/unified/test/: data page allocations are charged to
+cgroup /sys/fs/cgroup/unified/test/.
+
+When charging memory to the remote memcg (memcg specified with memcg=) and
+hitting the limit, the oom-killer will be invoked and will attempt to kill
+a process in the remote memcg. If no such processes are found, the remote
+charging process gets an ENOMEM. If the remote charging process is in the
+pagefault path, it gets killed.
+
+Only processes that have access to /sys/fs/cgroup/unified/test/cgroup.procs can
+mount a tmpfs with memcg=/sys/fs/cgroup/unified/test. Thus, a process is able
+to charge memory to a cgroup only if it itself is able to enter that cgroup.
+
+
 To specify the initial root directory you can use the following mount
 options:

--
2.34.0.rc1.387.gb447b232ab-goog

  parent reply	other threads:[~2021-11-11 23:42 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20211111234203.1824138-1-almasrymina@google.com>
2021-11-11 23:42 ` [PATCH v3 1/4] mm/shmem: support deterministic charging of tmpfs Mina Almasry
2021-11-11 23:42 ` [PATCH v3 2/4] mm/oom: handle remote ooms Mina Almasry
2021-11-12  7:51   ` Michal Hocko
2021-11-12  8:12     ` Mina Almasry
2021-11-12  8:36       ` Michal Hocko
2021-11-12 17:59         ` Mina Almasry
2021-11-15 10:58           ` Michal Hocko
2021-11-15 17:32             ` Shakeel Butt
2021-11-16  0:58             ` Mina Almasry
2021-11-16  9:28               ` Michal Hocko
2021-11-16  9:39                 ` Michal Hocko
2021-11-16 10:17                 ` Mina Almasry
2021-11-16 11:29                   ` Michal Hocko
2021-11-16 21:27                     ` Mina Almasry
2021-11-16 21:55                       ` Shakeel Butt
2021-11-18  8:48                         ` Michal Hocko
2021-11-19 22:32                           ` Mina Almasry
2021-11-18  8:47                       ` Michal Hocko
2021-11-11 23:42 ` Mina Almasry [this message]
2021-11-11 23:42 ` [PATCH v3 4/4] mm, shmem, selftests: add tmpfs memcg= mount option tests Mina Almasry

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