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From: Blaisorblade <blaisorblade@yahoo.it>
To: Andi Kleen <ak@suse.de>
Subject: Re: [PATCH 4/6] x86_64: fix L1_CACHE_SHIFT_MAX for Intel EM64T [for 2.6.14?]
Date: Wed, 26 Oct 2005 00:44:25 +0200
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Cc: Andrew Morton <akpm@osdl.org>, Jeff Dike <jdike@addtoit.com>,
       linux-kernel@vger.kernel.org,
       user-mode-linux-devel@lists.sourceforge.net
References: <20051025221105.21106.95194.stgit@zion.home.lan> <20051025221253.21106.22572.stgit@zion.home.lan> <200510260024.17241.ak@suse.de>
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On Wednesday 26 October 2005 00:24, Andi Kleen wrote:
> > No correctness issues, obviously. So this could even be merged for 2.6.14
> > (I'm not a fan of this idea, though).
>
> I don't think it's a good idea to mess with this for 2.6.14

> In general the maxaligned stuff is imho bogus and should be removed. That
> is what CONFIG_X86_GENERIC is for. It doesn't make sense imho to separate
> the variables in two aligned classes - either they should be aligned in all
> cases or they shouldn't.

For what I see, that's based on the tradeoff between space and contention - 
for instance there are few zones only, so there's no big waste. In practice, 
interpreting !X86_GENERIC as "I will run this kernel on _this_ processor" 
could also be done.

However, in case you didn't note, max_align is never enough on EM64T 
currently, right?
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade

	

	
		
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