linux-kernel - Re: Why Semaphore Hardware-Dependent?

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Message-ID: <Pine.LNX.4.64.0608271514130.22931@schroedinger.engr.sgi.com>
Date:	Sun, 27 Aug 2006 15:14:50 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andi Kleen <ak@...e.de>
cc:	Dong Feng <middle.fengdong@...il.com>,
	Paul Mackerras <paulus@...ba.org>, linux-kernel@...r.kernel.org
Subject: Re: Why Semaphore Hardware-Dependent?

On Sun, 27 Aug 2006, Andi Kleen wrote:

> x86-64 always uses the spinlocked version (vs i386 using the atomic one)
> and I haven't heard of anybody complaining.

Ia64 has special counters for rwsemaphores. I'd like to see if there is 
any performance loss. mmap_sem is a rwsemaphore. This is performance 
critical.

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