linux-kernel - Re: [PATCH/RFC] Have sane default values for cpusets

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Date:	Thu, 13 May 2010 23:19:06 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lennart Poettering <mzxreary@...inter.de>
Cc:	Dhaval Giani <dhaval.giani@...il.com>,
	James Kosin <jkosin@...comgrp.com>,
	linux-kernel@...r.kernel.org, menage@...gle.com,
	balbir@...ux.vnet.ibm.com, jsafrane@...hat.com, tglx@...utronix.de
Subject: Re: [PATCH/RFC] Have sane default values for cpusets

On Thu, 2010-05-13 at 16:03 +0200, Lennart Poettering wrote:
> > On Wed, 2010-05-12 at 21:07 +0200, Lennart Poettering wrote:
> > > See Dhaval's patch on the background of systemd
> > > (http://0pointer.de/blog/projects/systemd.html). When a service is
> > > started in systemd, we create a cgroup for it, when it ends, we remove
> > > it. 
> > 
> > I seriously hope that's optional, because I for one would really hate a
> > system that does that. I still mostly build kernels with only cpuset in
> > and really don't want anybody but me creating groups in there.
> 
> By default systemd will create its groups in the "debug" hierarchy, (at
> least for now, in the long run i'd like to see "noop" hierarchy or so,
> that doesn't sound so temporary), since that controller is not useful
> for anything but keeping track of processes. So it shouldn't bother you
> at all. 

Will it still work with a CONFIG_CGROUP=n kernel? I see distributions
deteriorate, you cannot even boot a raw bzImage kernel without initrd on
most distros (sure, its not too hard to fix, but still).

Also, I get all kinds of dumb-ass init-script failures for not having
modules but stuff built-in. A prime example is NFS failing on start on
both fedora and ubuntu with a built-in nfs server (for different but
both retarded reasons).

Requiring CONFIG_CGROUP=y to even get init running seems like a final
straw to ensure nobody will ever get anything to boot these days.


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