linux-kernel - Re: [patch 1/4] x86: FIFO ticket spinlocks

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Message-ID: <alpine.LFD.0.999.0711011819110.3342@woody.linux-foundation.org>
Date:	Thu, 1 Nov 2007 18:19:41 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Rik van Riel <riel@...hat.com>
cc:	Gregory Haskins <gregory.haskins.ml@...il.com>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 1/4] x86: FIFO ticket spinlocks



On Thu, 1 Nov 2007, Rik van Riel wrote:
> 
> Larry Woodman managed to wedge the VM into a state where, on his
> 4x dual core system, only 2 cores (on the same CPU) could get the
> zone->lru_lock overnight.  The other 6 cores on the system were
> just spinning, without being able to get the lock.

.. and this is almost always the result of a locking *bug*, not unfairness 
per se. IOW, unfairness just ends up showing the bug in the first place.

		Linus
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