From: Ingo Molnar <mingo@elte.hu>
To: Nick Piggin <npiggin@suse.de>
Cc: Andi Kleen <ak@suse.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [rfc][patch 2/2] x86_64: FIFO ticket spinlocks
Date: Mon, 16 Jul 2007 11:26:46 +0200 [thread overview]
Message-ID: <20070716092646.GA18423@elte.hu> (raw)
In-Reply-To: <20070716050134.GB19914@wotan.suse.de>
* Nick Piggin <npiggin@suse.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
next prev parent reply other threads:[~2007-07-16 9:26 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-16 4:59 [rfc][patch 1/2] spinlock: lockbreak cleanups Nick Piggin
2007-07-16 5:01 ` [rfc][patch 2/2] x86_64: FIFO ticket spinlocks Nick Piggin
2007-07-16 9:16 ` Alan Cox
2007-07-16 9:24 ` Nick Piggin
2007-07-16 9:26 ` Ingo Molnar [this message]
2007-07-16 9:45 ` Nick Piggin
2007-07-16 9:49 ` Ingo Molnar
2007-07-16 10:18 ` Nick Piggin
2007-07-17 14:25 ` Andi Kleen
2007-07-17 15:08 ` Nick Piggin
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