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From: "H. Peter Anvin" <hpa@zytor.com>
To: Anders H Kaseorg <andersk@MIT.EDU>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86_64: Patch paravirt inline replacements when loading modules
Date: Sat, 28 Jun 2008 16:15:54 -0700	[thread overview]
Message-ID: <4866C62A.2060808@zytor.com> (raw)
In-Reply-To: <alpine.DEB.1.10.0806281836020.31023@vinegar-pot.mit.edu>

Anders H Kaseorg wrote:
> 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.

OK, it's a performance regression.  I don't think it makes sense for 
2.6.26, but it should definitely go into 2.6.27.

Thanks!

	-hpa


  reply	other threads:[~2008-06-28 23:17 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-06-28 22:25 [PATCH] x86_64: Patch paravirt inline replacements when loading modules Anders H Kaseorg
2008-06-28 22:31 ` H. Peter Anvin
2008-06-28 22:45   ` Anders H Kaseorg
2008-06-28 23:15     ` H. Peter Anvin [this message]
2008-06-30 10:15       ` Ingo Molnar

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