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

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Date:	Wed, 14 Jan 2009 23:34:08 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, a.p.zijlstra@...llo.nl,
	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


* Kay Sievers <kay.sievers@...y.org> wrote:

> On Wed, Jan 14, 2009 at 22:41, Ingo Molnar <mingo@...e.hu> wrote:
> >
> > * Ingo Molnar <mingo@...e.hu> wrote:
> >
> >> > You just disproved your own case :(
> >>
> >> how so? 80% is not enough? I also checked Fedora and it has
> >> SCHED_DEBUG=y in its kernel rpms.
> >
> > Ubuntu has CONFIG_SCHED_DEBUG=y as well in their kernels.
> 
> $ cat /etc/SuSE-release
> openSUSE 11.1 (x86_64)
> VERSION = 11.1
> 
> $ uname -a
> Linux nga 2.6.27.7-9-default #1 SMP 2008-12-04 18:10:04 +0100 x86_64
> x86_64 x86_64 GNU/Linux
> 
> $ zgrep SCHED_DEBUG /proc/config.gz
> CONFIG_SCHED_DEBUG=y
> 
> $ zgrep DEBUG_MUTEX /proc/config.gz
> # CONFIG_DEBUG_MUTEXES is not set

Fedora has mutex debugging disabled too:

   # CONFIG_DEBUG_MUTEXES is not set

So the 3 main Linux distros, generating ~95% of the kerneloops.org 
feedback traffic, all have SCHED_DEBUG=y, and at least two have 
!DEBUG_MUTEXES. (possibly Ubuntu has that disabled it too)

	Ingo
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