linux-kernel - Re: [PATCH 1/3] Fix COW D-cache aliasing on fork

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Message-Id: <20061020.191134.63996591.davem@davemloft.net>
Date:	Fri, 20 Oct 2006 19:11:34 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	torvalds@...l.org
Cc:	ralf@...ux-mips.org, nickpiggin@...oo.com.au, akpm@...l.org,
	linux-kernel@...r.kernel.org, anemo@....ocn.ne.jp,
	linux-arch@...r.kernel.org, schwidefsky@...ibm.com,
	James.Bottomley@...elEye.com
Subject: Re: [PATCH 1/3] Fix COW D-cache aliasing on fork

From: Linus Torvalds <torvalds@...l.org>
Date: Fri, 20 Oct 2006 17:38:32 -0700 (PDT)

> I think (but may be mistaken) that ARM _does_ have pure virtual caches 
> with a process ID, but people have always ended up flushing them at 
> context switch simply because it just causes too much trouble.
> 
> Sparc? VIPT too? Davem?

sun4c is VIVT, but has no SMP variants.
sun4m has both VIPT and PIPT.

> But it would be good to have something for the early -rc1 sequence for 
> 2.6.20, and maybe the MIPS COW D$ patches are it, if it has performance 
> advantages on MIPS that can also be translated to other virtual cache 
> users..

I think it could help for sun4m highmem configs.
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