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

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Message-ID: <Pine.LNX.4.64.0608271404260.22510@schroedinger.engr.sgi.com>
Date:	Sun, 27 Aug 2006 14:05:52 -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:

> rwsems don't -- there are two flavours: a generic spinlock'ed one and a 
> complicated atomic based one that only works on some architectures. 
> As far as I know nobody has demonstrated a clear performance increase
> from the first so it might be possible to switch all to the generic
> implementation.

Yup that would be the major issue.I'd be interested to see some tests in 
that area.
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