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Date: Thu, 05 Apr 2007 08:59:09 +1000
From: Rusty Russell <rusty@...tcorp.com.au>
To: Andi Kleen <ak@...e.de>
Cc: Jeremy Fitzhardinge <jeremy@...p.org>,
virtualization@...ts.osdl.org,
Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...e.hu>,
lkml <linux-kernel@...r.kernel.org>
Subject: Re: [patch 04/17] Add pagetable accessors to pack and unpack
pagetable entries
On Wed, 2007-04-04 at 17:56 +0200, Andi Kleen wrote:
> On Wednesday 04 April 2007 17:45:44 Jeremy Fitzhardinge wrote:
> > Andi Kleen wrote:
> > > Why is there a difference for null syscall? I had assumed we patched all the
> > > fast path cases relevant there. Do you have an idea where it comes from?
> >
> > Sure. There's indirect calls for things like sti/cli/iret. It goes
> > back to native speed when you patch the real instructions inline.
>
> I was talking about the patched case. It seemed to be a little slower
> too, but in theory it shouldn't have been, no?
You'll still have the damage inflicted on gcc's optimizer, though.
Rusty.
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