linux-kernel - Re: Spinlocks: Factor our GENERIC_LOCKBREAK in order to avoid spin with irqs disable

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Message-ID: <Pine.LNX.4.64.0806231345001.28304@schroedinger.engr.sgi.com>
Date:	Mon, 23 Jun 2008 13:45:57 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	Petr Tesarik <ptesarik@...e.cz>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: Spinlocks: Factor our GENERIC_LOCKBREAK in order to avoid spin
 with irqs disable

On Mon, 23 Jun 2008, Peter Zijlstra wrote:

> > It is good that the locks are build with _trylock and _can_lock because 
> > then we can reenable interrupts while spinning.
> 
> Well, good and bad, the turn side is that fairness schemes like ticket
> locks are utterly defeated.

True. But maybe we can make these fairness schemes more generic so that 
they can go into core code?

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