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Date: Wed, 14 Dec 2005 12:52:00 +0100
From: Andi Kleen <ak@suse.de>
Subject: Re: [PATCH 1/19] MUTEX: Introduce simple mutex implementation
Message-ID: <20051214115159.GG15804@wotan.suse.de>
References: <dhowells1134431145@warthog.cambridge.redhat.com> <3874.1134480759@warthog.cambridge.redhat.com> <15167.1134488373@warthog.cambridge.redhat.com> <1134490205.11732.97.camel@localhost.localdomain> <1134556187.2894.7.camel@laptopd505.fenrus.org> <1134558188.25663.5.camel@localhost.localdomain> <1134558507.2894.22.camel@laptopd505.fenrus.org> <1134559470.25663.22.camel@localhost.localdomain> <20051214033536.05183668.akpm@osdl.org> <1134560671.2894.30.camel@laptopd505.fenrus.org>
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To: Arjan van de Ven <arjan@infradead.org>
Cc: Andrew Morton <akpm@osdl.org>, Alan Cox <alan@lxorguk.ukuu.org.uk>, dhowells@redhat.com, cfriesen@nortel.com, torvalds@osdl.org, hch@infradead.org, matthew@wil.cx, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org
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> * mutex use is a candidate for a "spinaphore" treatment (unlike counting
> semaphores)

I think that would be interesting experiment for page faults.
But they actually use rwsems, not normal semaphores.

-Andi