linux-kernel - Re: boot cgroup questions

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]

Date:	Tue, 11 Mar 2008 19:53:09 -0700
From:	Max Krasnyansky <maxk@...lcomm.com>
To:	Paul Menage <menage@...gle.com>
CC:	Paul Jackson <pj@....com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: boot cgroup questions



Paul Menage wrote:
> On Tue, Mar 11, 2008 at 7:34 PM, Max Krasnyansky <maxk@...lcomm.com> wrote:
>>  Suppose we were to do it from kernel. What's the right way to create a cgroup
>>  without mounting a cgroupfs ?
> 
> There isn't really a way, but you could always kern_mount() a
> filesystem inside the kernel.
Aha, that's what I was missing. kern_mount(). Cool :).

>>  I just want to play with it. There are a couple of advantages that I see for
>>  doing it from kernel. We can move 'kthreadd' and idle threads into the 'boot'
>>  cgroup early on and therefor later on won't even have to iterate through the
>>  tasks and stuff.
> 
> Would this be done based on some boot commandline option? I don't
> think you'd want to do it unconditionally.
Hmm, I believe the original discussion was about doing it unconditionally.
Why not I guess ? It probably won't even affect your existing scripts since
they will be able to move tasks into another set just like they do now. The
only thing I can think of is that if your scripts use sched_load_balance then
they will now have to unset it in the 'boot' set as well. Otherwise since the
'boot' set will be non-exclusive (cpus and mems) it should not really affect
anything.
So what's your concern with unconditional 'boot' cgroup/cpuset ?

Max
--
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/