linux-kernel - Re: [patch] Re: autogroup: sched

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: <1298917794.9387.31.camel@marge.simson.net>
Date:	Mon, 28 Feb 2011 19:29:54 +0100
From:	Mike Galbraith <efault@....de>
To:	torbenh <torbenh@....de>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Yong Zhang <yong.zhang0@...il.com>, bharata@...ux.vnet.ibm.com,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, linux-audio-dev@...ic.columbia.edu,
	linux-audio-user@...ic.columbia.edu
Subject: Re: [patch] Re: autogroup: sched_setscheduler() fails

On Mon, 2011-02-28 at 18:53 +0100, torbenh wrote:
> 
> On Tue, Feb 22, 2011 at 03:47:53PM +0100, Mike Galbraith wrote:
> > On Tue, 2011-02-22 at 13:24 +0100, torbenh wrote:
> > > On Fri, Feb 18, 2011 at 01:50:12PM +0100, Mike Galbraith wrote:
>  
> > > > Sounds like you just want to turn CONFIG_RT_GROUP_SCHED off.
> > > 
> > > but distros turn it on.
> > > we could prevent debian from turning it on. 
> > > now opensuse 11.4 has turned it on.
> > 
> > If you or anyone else turns on RT_GROUP_SCHED, you will count your
> > beans, and pay up front, or you will not play.  That's a very sensible
> > policy for realtime.
> 
> this probably means that generic computer distros should not turn this
> option on ?

Yeah, agreed, not for a great default config, but only because
newfangled automation thingies can't (possibly?) deal with it sanely.
 
> > If systemd deals with it at all, seems to me it can only make a mess of
> > it.  But who knows, maybe they made a clever allocator.  If they didn't,
> > they'll need an escape hatch methinks.
> 
> the problem is that audio applications can not really pre allocate their
> cpu needs. user can add processing plugins until he pushes his machine
> to the limit. (or the cgroup where his process is running in)
> 
> we dont really have a mechanism for plugins to publish their needed
> cycles.

I can't see how it could matter what any individual group of arbitrary
groups N (who can appear/disappear in the blink of an eye) advertises as
it's wish of the instant.  "Hard" + "Arbitrary" doesn't compute for me.

	-Mike

--
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/