Subject: Re: [RFC/RFT PATCH v3] sched: automated per tty task groups
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Lennart Poettering <mzxreary@0pointer.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Dhaval Giani <dhaval.giani@gmail.com>, Mike Galbraith <efault@gmx.de>,
        Vivek Goyal <vgoyal@redhat.com>, Oleg Nesterov <oleg@redhat.com>,
        Markus Trippelsdorf <markus@trippelsdorf.de>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>,
        Balbir Singh <balbir@linux.vnet.ibm.com>
In-Reply-To: <20101116181603.GC19327@tango.0pointer.de>
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	 <1289856350.14719.135.camel@maggy.simson.net>
	 <20101116015648.GA11534@redhat.com>
	 <1289916171.5169.117.camel@maggy.simson.net>
	 <1289916683.2109.625.camel@laptop>
	 <AANLkTimun-VUNx77wJ4w7Z4io2jder=xkN5pCujPQL-a@mail.gmail.com>
	 <20101116170312.GA19327@tango.0pointer.de>
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Date: Tue, 16 Nov 2010 19:21:55 +0100
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On Tue, 2010-11-16 at 19:16 +0100, Lennart Poettering wrote:
> On Tue, 16.11.10 09:11, Linus Torvalds (torvalds@linux-foundation.org) wrote:
> 
> > 
> > On Tue, Nov 16, 2010 at 9:03 AM, Lennart Poettering
> > <mzxreary@0pointer.de> wrote:
> > >
> > > Binding something like this to TTYs is just backwards.
> > 
> > Numbers talk, bullshit walks.
> > 
> > The numbers have been quoted. The clear interactive behavior has been seen.
> 
> Here's my super-complex patch btw, to achieve exactly the same thing
> from userspace without involving any kernel or systemd patching and
> kernel-side logic. Simply edit your own ~/.bashrc and add this to the end:
> 
>   if [ "$PS1" ] ; then  
>           mkdir -m 0700 /sys/fs/cgroup/cpu/user/$$
>           echo $$ > /sys/fs/cgroup/cpu/user/$$/tasks
>   fi
> 
> Then, as the superuser do this:
> 
>   mount -t cgroup cgroup /sys/fs/cgroup/cpu -o cpu
>   mkdir -m 0777 /sys/fs/cgroup/cpu/user
> 
> Done. Same effect. However: not crazy.
> 
> I am not sure I myself will find the time to prep some 'numbers' for
> you. They'd be the same as with the kernel patch anyway. But I am sure
> somebody else will do it for you...

Not quite the same, you're nesting one level deeper. But the reality is,
not a lot of people will change their userspace. 
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