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Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

From:  Lennart Poettering <mzxreary-AT-0pointer.de>
To:  Linus Torvalds <torvalds-AT-linux-foundation.org>
Subject:  Re: [RFC/RFT PATCH v3] sched: automated per tty task groups
Date:  Tue, 16 Nov 2010 19:16:03 +0100
Message-ID:  <20101116181603.GC19327@tango.0pointer.de>
Cc:  Dhaval Giani <dhaval.giani-AT-gmail.com>, Peter Zijlstra <a.p.zijlstra-AT-chello.nl>, Mike Galbraith <efault-AT-gmx.de>, Vivek Goyal <vgoyal-AT-redhat.com>, Oleg Nesterov <oleg-AT-redhat.com>, Markus Trippelsdorf <markus-AT-trippelsdorf.de>, Mathieu Desnoyers <mathieu.desnoyers-AT-efficios.com>, Ingo Molnar <mingo-AT-elte.hu>, LKML <linux-kernel-AT-vger.kernel.org>, Balbir Singh <balbir-AT-linux.vnet.ibm.com>
Archive-link:  Article

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...

Lennart

-- 
Lennart Poettering - Red Hat, Inc.


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