Re: auto_translated_physmap in Fedora

[Rik van Riel <riel@redhat.com>]

Pete Zaitcev wrote:
> I noticed one curious thing while working on some issues with Fedora.
> At least in 2.6.17-1.2302_FC6xen, the following evaluates to false:
> 
>         if (xen_feature(XENFEAT_auto_translated_physmap))
>                 return pfn;

> So I am curious, if this is something anyone cares about.
> Also, why does it happen? If it's a feature which cannot be enabled
> (anymore), perhaps we can simply the code and get some performance
> by removing the run-time checks.

Well, when doing migration (especially during migration)
maybe the mode is switched ?

I know we go into shadow pagetable mode during migration...

-- 
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan