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

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Message-ID: <20090114202736.GB6519@elte.hu>
Date:	Wed, 14 Jan 2009 21:27:36 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	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


* 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.

	Ingo
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