Re: [PATCH] x86_64: Patch paravirt inline replacements when loadingmodules
From: H. Peter Anvin
Date: Sat Jun 28 2008 - 19:17:44 EST
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
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