Message-ID: <40C00E5E.1090002@yahoo.com.au>
Date: Fri, 04 Jun 2004 15:53:34 +1000
From: Nick Piggin <nickpiggin@yahoo.com.au>
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To: Andrew Morton <akpm@osdl.org>
CC: pj@sgi.com, rusty@rustcorp.com.au, linux-kernel@vger.kernel.org, ak@muc.de,
       ashok.raj@intel.com, hch@infradead.org, jbarnes@sgi.com,
       joe.korty@ccur.com, manfred@colorfullife.com, colpatch@us.ibm.com,
       mikpe@csd.uu.se, Simon.Derr@bull.net, wli@holomorphy.com
Subject: Re: [PATCH] cpumask 5/10 rewrite cpumask.h - single bitmap based
 implementation
References: <20040603094339.03ddfd42.pj@sgi.com>	<20040603101010.4b15734a.pj@sgi.com>	<1086313667.29381.897.camel@bach>	<40BFD839.7060101@yahoo.com.au>	<20040603223005.01bbab21.pj@sgi.com>	<40C00A2B.1040606@yahoo.com.au> <20040603224033.2dc5da9f.akpm@osdl.org>
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Andrew Morton wrote:
> Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> 
>> Yes, I'm all for the full cpumask abstraction.
> 
> 
> Where do we stand wrt pass-by-reference?  I remember there was initially
> some concern that lugging 512-bit scalars around by value was expensive, so
> Bill's original work was at least geared toward pass-by-reference?
> 

That is a valid concern. One I hadn't really thought about
as the patch is coming from SGI :)

kernel/sched.c doesn't pass around cpumask_t's anywhere
critical anymore (this used to be a problem). Any other
important places spring to mind?
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