linux-kernel - Re: [rfc][patch 2/2] x86

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Message-ID: <20070716092646.GA18423@elte.hu>
Date:	Mon, 16 Jul 2007 11:26:46 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Andi Kleen <ak@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [rfc][patch 2/2] x86_64: FIFO ticket spinlocks


* Nick Piggin <npiggin@...e.de> wrote:

> [...] trylock is more significantly slower, but they are relatively 
> rare.

trylock is the main thing that the spinlock debugging code uses, and 
SPINLOCK_DEBUG is frequently enabled by distro kernels. OTOH, the cost 
looks like to be +5 instructions, right? Still ...

	Ingo
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