XEN same page merging.

XEN same page merging.

[Mazen Ezzeddine (Student)]

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Dear all,


Could you please advise me whether XEN has a mechanism to merge/map same memory pages of different VMs into a single physical page in the available physical address space. If yes, is there a compilation flag to disable such feature?



Please note I am running hardware-assisted XEN on an ARM Cortex-A15.



Thank you so much.


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Re: XEN same page merging.

[Julien Grall]

On 20/05/15 09:41, Mazen Ezzeddine (Student) wrote:
> Dear all,

Hello,

> Could you please advise me whether XEN has a mechanism to merge/map same
> memory pages of different VMs into a single physical page in the
> available physical address space. If yes, is there a compilation flag
> to disable such feature?

Xen doesn't merge/map automatically the same physical memory page in
different VMs.

Although, it may be possible for a guest to map a page from another
domain in order to copy data.

Regards,

-- 
Julien Grall