From: Tejun Heo <tj@kernel.org>
To: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
Cc: lkml <linux-kernel@vger.kernel.org>,
Lennart Poettering <lennart@poettering.net>
Subject: [PATCH cgroup/for-4.15-fixes] cgroup: add warning about RT not being supported on cgroup2
Date: Tue, 5 Dec 2017 09:13:57 -0800 [thread overview]
Message-ID: <20171205171357.GU2421075@devbig577.frc2.facebook.com> (raw)
In-Reply-To: <CAKgNAkibQ5NuvTFFqTt7wXK8KLp6f-LVfai74JVmYoTmBdw62w@mail.gmail.com>
From: Tejun Heo <tj@kernel.org>
Date: Tue, 5 Dec 2017 09:10:17 -0800
We haven't yet figured out what to do with RT threads on cgroup2.
Document the limitation.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
---
Documentation/cgroup-v2.txt | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/Documentation/cgroup-v2.txt b/Documentation/cgroup-v2.txt
index 779211f..55a28f4 100644
--- a/Documentation/cgroup-v2.txt
+++ b/Documentation/cgroup-v2.txt
@@ -898,6 +898,10 @@ controller implements weight and absolute bandwidth limit models for
normal scheduling policy and absolute bandwidth allocation model for
realtime scheduling policy.
+WARNING: cgroup2 doesn't yet support control of realtime processes and
+the cpu controller can only be enabled when all RT processes are in
+the root cgroup.
+
CPU Interface Files
~~~~~~~~~~~~~~~~~~~
--
2.9.5
next prev parent reply other threads:[~2017-12-05 17:14 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-04 21:35 Writing "+pids" to cgroup.subtree_control flie yields EINVAL Michael Kerrisk (man-pages)
2017-12-04 21:47 ` Tejun Heo
2017-12-05 7:45 ` Michael Kerrisk (man-pages)
2017-12-05 16:00 ` Tejun Heo
2017-12-05 16:44 ` Michael Kerrisk (man-pages)
2017-12-05 17:13 ` Tejun Heo [this message]
2017-12-05 18:24 ` [PATCH cgroup/for-4.15-fixes] cgroup: add warning about RT not being supported on cgroup2 Michael Kerrisk (man-pages)
2017-12-05 18:29 ` [PATCH v2 " Tejun Heo
2017-12-05 18:53 ` Michael Kerrisk (man-pages)
2017-12-05 19:48 ` Tejun Heo
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