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

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Message-Id: <20090114105300.66bd014d.akpm@linux-foundation.org>
Date:	Wed, 14 Jan 2009 10:53:00 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Gregory Haskins <ghaskins@...ell.com>,
	Matthew Wilcox <matthew@....cx>,
	Andi Kleen <andi@...stfloor.org>,
	Chris Mason <chris.mason@...cle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nick Piggin <npiggin@...e.de>,
	Peter Morreale <pmorreale@...ell.com>,
	Sven Dietrich <SDietrich@...ell.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [GIT PULL] adaptive spinning mutexes

On Wed, 14 Jan 2009 19:33:19 +0100 Ingo Molnar <mingo@...e.hu> wrote:

> Please pull the adaptive-mutexes-for-linus git tree

<fear>

- It seems a major shortcoming that the feature is disabled if
  CONFIG_DEBUG_MUTEXES=y.  It means that lots of people won't test it.

- When people hit performance/latency oddities, it would be nice if
  they had a /proc knob with which they could disable this feature at
  runtime.

  This would also be useful for comparative performance testing.
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