linux-kernel - Re: [PATCH v5 8/9] x86-64: Emulate legacy vsyscalls

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Message-ID: <BANLkTikOWiTJ9zSvtMMT4S27WQW2Fsz_Jw@mail.gmail.com>
Date:	Tue, 7 Jun 2011 09:59:20 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	pageexec@...email.hu
Cc:	Ingo Molnar <mingo@...e.hu>, Andrew Lutomirski <luto@....edu>,
	x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Jesper Juhl <jj@...osbits.net>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Jan Beulich <JBeulich@...ell.com>,
	richard -rw- weinberger <richard.weinberger@...il.com>,
	Mikael Pettersson <mikpe@...uu.se>,
	Andi Kleen <andi@...stfloor.org>,
	Brian Gerst <brgerst@...il.com>,
	Louis Rilling <Louis.Rilling@...labs.com>,
	Valdis.Kletnieks@...edu
Subject: Re: [PATCH v5 8/9] x86-64: Emulate legacy vsyscalls

On Tue, Jun 7, 2011 at 1:49 AM,  <pageexec@...email.hu> wrote:
>> A fastpath is defined by optimization considerations applied to a
>> codepath (the priority it gets compared to other codepaths), *not* by
>> its absolute performance.
>
> we're not talking about random arbitrarily defined paths here but the
> impact of putting well predicted branches into the pf handler vs. int xx
> (are you perhaps confused by 'fast path' vs. 'fastpath'?).

Well, I'm sure confused by 'fast path' vs 'fastpath'! Can you please
explain the difference? Thanks!

                                Pekka
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