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
next prev parent 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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