linux-kernel - Re: [GIT PULL] adaptive spinning mutexes

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Message-Id: <20090114124436.9ac29330.akpm@linux-foundation.org>
Date:	Wed, 14 Jan 2009 12:44:36 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	a.p.zijlstra@...llo.nl, torvalds@...ux-foundation.org,
	paulmck@...ux.vnet.ibm.com, ghaskins@...ell.com, matthew@....cx,
	andi@...stfloor.org, chris.mason@...cle.com,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-btrfs@...r.kernel.org, tglx@...utronix.de, npiggin@...e.de,
	pmorreale@...ell.com, SDietrich@...ell.com,
	dmitry.adamushko@...il.com, hannes@...xchg.org
Subject: Re: [GIT PULL] adaptive spinning mutexes

On Wed, 14 Jan 2009 21:27:36 +0100
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> 
> > On Wed, 2009-01-14 at 11:36 -0800, Andrew Morton wrote:
> > 
> > > Do people enable CONFIG_SCHED_DEBUG?
> > 
> > Well, I have it always enabled, but I've honestly no idea if that makes
> > me weird.
> > 
> > > CONFIG_DEBUG_MUTEXES=n, CONFIG_SCHED_DEBUG=y is getting to be a pretty 
> > > small subset?
> > 
> > Could be, do you fancy me doing a sysctl? shouldn't be hard.
> 
> i dunno, why another fancy sysctl for something that fits quite nicely 
> into the existing sched_features scheme that we've been using for such 
> purposes for the past 3-4 kernel releases?
> 
> we always provided various toggles for new scheduler features via 
> /sys/debug/sched_features, so that people can do performance regression 
> testing, and it works quite well.
> 

If we know that this control will be reliably available in packaged
kernels then fine.  But how to we arrange for that?
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