linux-kernel - Re: [PATCH] cpuset: allow empty cpu/node masks

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Message-ID: <BANLkTi=4vb5bm0xD=XVJGGD06_BHz+Ciyw@mail.gmail.com>
Date:	Tue, 19 Apr 2011 13:47:21 +0200
From:	Paul Menage <menage@...gle.com>
To:	Konstantin Khlebnikov <khlebnikov@...allels.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpuset: allow empty cpu/node masks

On Tue, Apr 19, 2011 at 1:08 PM, Konstantin Khlebnikov
<khlebnikov@...allels.com> wrote:
> Is cgroup.clone_children=1 planned to be default?

I don't think so. It would be a user-visible API change, for no
significant benefit.

>
> So, I just want to make cgroup worked out of the box:
>
> mount -t cgroup cgroup /cgroup
> mkdir /cgroup/foo
> echo $$ > /cgroup/foo/tasks

Just because cgroups has a very simple filesystem-based ASCII API,
that doesn't stop it from being a complex and
barely-human-comprehendable system. :-)

I'm not sure what we gain by making that approach work - to do useful
stuff with cgroups (rather than simply playing around with moving
tasks into cgroups) you do need to have a better understanding of
what's going on. It's not too hard to make the initial instructions
explain how to only mount the subsystems that you want, or pass the
clone_children option.

Paul
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