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From: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
To: Tejun Heo <tj@kernel.org>
Cc: mtk.manpages@gmail.com, lkml <linux-kernel@vger.kernel.org>
Subject: Writing "+pids" to cgroup.subtree_control flie yields EINVAL
Date: Mon, 4 Dec 2017 22:35:13 +0100	[thread overview]
Message-ID: <b2794e0c-1b00-fb81-4d6a-00a2382c7676@gmail.com> (raw)

Hello Tejun,

I was trying to do some simple testing ot the CPU controller
that is merged into 4.15, and ran immediately into some confusion.
In the root cgroup on a freshly booted 4.150-rc1, I try the following:

# pwd
/sys/fs/cgroup/unified
# echo '+cpu' > cgroup.subtree_control 
sh: echo: write error: Invalid argument

What am I missing> I presume I'm missing something obvious, although
nothing jumped out at me as I read the cgroups-v2.txt file.

Cheers,

Michael

-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/

             reply	other threads:[~2017-12-04 21:35 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-04 21:35 Michael Kerrisk (man-pages) [this message]
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         ` [PATCH cgroup/for-4.15-fixes] cgroup: add warning about RT not being supported on cgroup2 Tejun Heo
2017-12-05 18:24           ` 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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