linux-kernel - Re: [RFT/PATCH v2 2/6] x86-64: Optimize vread

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Message-ID: <BANLkTikhG9deEo0VvrUSXzn850GjBvYtiw@mail.gmail.com>
Date:	Thu, 7 Apr 2011 11:30:47 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andy Lutomirski <luto@....edu>, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [RFT/PATCH v2 2/6] x86-64: Optimize vread_tsc's barriers

On Thu, Apr 7, 2011 at 11:15 AM, Andi Kleen <andi@...stfloor.org> wrote:
>
> I would prefer to be safe than sorry.

There's a difference between "safe" and "making up theoretical
arguments for the sake of an argument".

If Intel _documented_ the "barriers on each side", I think you'd have a point.

As it is, we're not doing the "safe" thing, we're doing the "extra
crap that costs us and nobody has ever shown is actually worth it".

                               Linus
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