Xen devel - Jul 2008 - [PATCH 0/2] Add hugetlb support for PV

Here is a set of small patches that enables hugetlb on PV machines.  They are 
against xen-unstable and linux-2.6.18-xen.

The patches are specifically for x86_64.

I originally had these patches working back in May, but recently for some 
reason my machine now refuses to boot the baseline xen-unstable, so
I''ve been
unable to verify them.  However, they should still work.

Comments, bug reports,  and suggestions are welcome.

Dave McCracken
Oracle Corp.

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Here is the hypervisor portion of hugetlb support for PV machines.



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Here is the patch against the kernel that enables hugetlb support for PV 
machines.

Dave McCracken
Oracle Corp.


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On Thursday 24 July 2008, Dave McCracken wrote:
> Here is the hypervisor portion of hugetlb support for PV machines.
Oops.  Here''s really the hypervisor portion.  The first one was a copy
of the
kernel portion.

Dave McCracken
Oracle Corp.



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>>> Dave McCracken <dcm@mccr.org> 24.07.08 15:45 >>>
>
>Here is a set of small patches that enables hugetlb on PV machines.  They
are
>against xen-unstable and linux-2.6.18-xen.
>
>The patches are specifically for x86_64.
>
>I originally had these patches working back in May, but recently for some 
>reason my machine now refuses to boot the baseline xen-unstable, so
I''ve been
>unable to verify them.  However, they should still work.
>
>Comments, bug reports,  and suggestions are welcome.
I must be missing something, but I can''t see how you guarantee the
super pages to be contiguous in machine memory. And even if you did,
the hypervisor would still need to do accounting on all the 4k portions
a super page consists of when it gets mapped/unmapped.

Jan


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Jan Beulich wrote:
>>>> Dave McCracken <dcm@mccr.org> 24.07.08 15:45 >>>
>>>>         
>> Here is a set of small patches that enables hugetlb on PV machines. 
They are
>> against xen-unstable and linux-2.6.18-xen.
>>
>> The patches are specifically for x86_64.
>>
>> I originally had these patches working back in May, but recently for
some
>> reason my machine now refuses to boot the baseline xen-unstable, so
I''ve been
>> unable to verify them.  However, they should still work.
>>
>> Comments, bug reports,  and suggestions are welcome.
>>     
>
> I must be missing something, but I can''t see how you guarantee the
> super pages to be contiguous in machine memory. And even if you did,
> the hypervisor would still need to do accounting on all the 4k portions
> a super page consists of when it gets mapped/unmapped.
>   
Yeah, I''m pretty sure there has to be a lot more to it than that.

    J


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