linux-kernel - Re: [PATCH] x86_64: Patch paravirt inline replacements when loading modules

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Message-ID: <alpine.DEB.1.10.0806281836020.31023@vinegar-pot.mit.edu>
Date:	Sat, 28 Jun 2008 18:45:29 -0400 (EDT)
From:	Anders H Kaseorg <andersk@....EDU>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86_64: Patch paravirt inline replacements when loading
 modules

On Sat, 28 Jun 2008, H. Peter Anvin wrote:
> Not having looked at this in detail, is this a *current* problem or a 
> *future* problem, i.e. does it fix a bug that's currently in the kernel?

It's a current problem.  The current situation is that .parainstructions 
are patched into the kernel core and modules on i386, but only the kernel 
core on x86_64.  This results in a slight performance regression in x86_64 
modules, compared to the situation before .parainstructions existed.  My 
patch restores full performance of x86_64 modules.

Anders

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