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To: linux-kernel@vger.kernel.org
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH] Futexes IV (Fast Lightweight Userspace Semaphores)
Date: 8 Mar 2002 15:44:45 -0800
Organization: Transmeta Corporation, Santa Clara CA
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In-Reply-To: <E16jRAU-0007QU-00@the-village.bc.nu> <20020308225425.772D13FE06@smtp.linux.ibm.com>
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Copyright: Copyright 2002 H. Peter Anvin - All Rights Reserved
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Followup to:  <20020308225425.772D13FE06@smtp.linux.ibm.com>
By author:    Hubertus Franke <frankeh@watson.ibm.com>
In newsgroup: linux.dev.kernel
> >
> > Can we go to cache line alignment - for an array of locks thats clearly
> > advantageous
> 
> NO and let me explain.
> 
> I would to be able to integrate the lock with the data.
> This is much more cache friendly then putting the lock on a different 
> cacheline.
> 

Not just cache, but programmer-friendly as well.  Data structures
containing locks (sometimes multiple and related) are really the
common case.

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt	<amsp@zytor.com>
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