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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1289931715.2109.648.camel@laptop>
Date:	Tue, 16 Nov 2010 19:21:55 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Lennart Poettering <mzxreary@...inter.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Mike Galbraith <efault@....de>,
	Vivek Goyal <vgoyal@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

On Tue, 2010-11-16 at 19:16 +0100, Lennart Poettering wrote:
> On Tue, 16.11.10 09:11, Linus Torvalds (torvalds@...ux-foundation.org) wrote:
> 
> > 
> > On Tue, Nov 16, 2010 at 9:03 AM, Lennart Poettering
> > <mzxreary@...inter.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. 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/