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

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Message-ID: <20121202192733.GA19824@gmail.com>
Date:	Sun, 2 Dec 2012 20:27:33 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Mike Galbraith <efault@....de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	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


* Mike Galbraith <efault@....de> wrote:

> On Sat, 2012-12-01 at 22:44 +0100, Ingo Molnar wrote:
> 
> > 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?
> 
> Or, whack the file and don't bother with a printk either.  If 
> it's in your config, and your command line doesn't contain 
> noautogroup, it's on, so the info is already present (until 
> buffer gets full).  That makes for even fewer lines dedicated 
> to dinky sideline feature.
> 
> Or (as previously mentioned) just depreciate (or rip out) the 
> whole thing since systemd is propagating everywhere anyway, 
> and offers the same functionality.
> 
> For 3.7, a revert of 800d4d30c8f2 would prevent the explosion 
> when folks play with the now non-functional on/off switch 
> (task groups are required to _always_ exist, that commit 
> busted the autogroup assumption), so is perhaps a viable 
> quickfix until autogroups fate is decided?

Linus, which one would be your preference? I'm fine with the 
first and third options - #2 that rips it all out looks like
a sad removal of an otherwise useful feature.

( The fourth option would be to fix the dynamic knobs - there's 
  no patch for that yet. )

Thanks,

	Ingo
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