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Date:	Sat, 28 Feb 2009 10:39:58 -0800
From:	Arjan van de Ven <>
To:	Ingo Molnar <>
Cc:	Linus Torvalds <>,
	Nick Piggin <>,
	Salman Qazi <>,,, Thomas Gleixner <>,
	"H. Peter Anvin" <>, Andi Kleen <>
Subject: Re: [patch] x86, mm: pass in 'total' to __copy_from_user_*nocache()

On Sat, 28 Feb 2009 19:27:59 +0100
Ingo Molnar <> wrote:

> OTOH, given how draconian non-temporal stores are, i'm leaning 
> towards removing them from the x86 code altogether. If it matter 
> to performance somewhere it can be reintroduced, based on really 
> well backed up numbers.

I think that is mostly the right approach; O_DIRECT could be the
exception to that (because there we don't only wipe it from the cpu
cache due to DMA, it even gets wiped from the pagecache!).
But I can see that being too special of a case to care about in the
grand scheme of things (although the database people will now get upset
with me ;-)

Arjan van de Ven 	Intel Open Source Technology Centre
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