Date: Wed, 14 Jan 2009 12:44:36 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: a.p.zijlstra@chello.nl, torvalds@linux-foundation.org,
       paulmck@linux.vnet.ibm.com, ghaskins@novell.com, matthew@wil.cx,
       andi@firstfloor.org, chris.mason@oracle.com,
       linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
       linux-btrfs@vger.kernel.org, tglx@linutronix.de, npiggin@suse.de,
       pmorreale@novell.com, SDietrich@novell.com, dmitry.adamushko@gmail.com,
       hannes@cmpxchg.org
Subject: Re: [GIT PULL] adaptive spinning mutexes
Message-Id: <20090114124436.9ac29330.akpm@linux-foundation.org>
In-Reply-To: <20090114202736.GB6519@elte.hu>
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On Wed, 14 Jan 2009 21:27:36 +0100
Ingo Molnar <mingo@elte.hu> wrote:

> 
> * Peter Zijlstra <a.p.zijlstra@chello.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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