linux-kernel - Re: [RFC GIT PULL] scheduler fix for autogroups

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Message-ID: <20121201214438.GA6544@gmail.com>
Date:	Sat, 1 Dec 2012 22:44:38 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Mike Galbraith <efault@....de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC GIT PULL] scheduler fix for autogroups

* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Sat, Dec 1, 2012 at 3:16 AM, Ingo Molnar <mingo@...nel.org> wrote:
> >
> > Please [RFC] pull the latest sched-urgent-for-linus git tree
> > from:
> 
> No. That patch is braindead. I wouldn't pull it even if it 
> wasn't this late.
> 
> Why the hell leave a read-only 'sched_autogroup_enabled' proc 
> file?
>
> What the f*ck is the point? It looks like the flag still 
> exists (we test it), but now there's no point to it, since you 
> can't change it.
> 
> What am I missing?

You are not missing anything. That flag is my fault not Mike's: 
I booted the initial version of that patch but was unsure 
whether autogroups was enabled - it's a pretty transparent 
feature. So I figured that having that flag (but readonly) would 
give us this information definitely.

So I suggested to Mike to keep that flag so that user-space is 
informed that autogroups is enabled. It seemed like a cute 
usability twist at that time, and there's existing precedent for 
it in /proc, but now I'm not so sure anymore...

Should we use some other file for that - or no file at all and 
just emit a bootup printk for kernel hackers with a short 
attention span?

Thanks,

	Ingo
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