Re: [patch 1/9] Guest page hinting: unused / free pages.

[Rik van Riel]

Martin Schwidefsky wrote:
> From: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
> From: Hubertus Franke <frankeh@xxxxxxxxxxxxxx>
> From: Himanshu Raj <rhim@xxxxxxxxxxxxx>
>
> [patch 1/9] Guest page hinting: unused / free pages.
>
> A very simple but already quite effective improvement in the handling
> of guest memory vs. host memory is to tell the host when pages are
> free. 

Would it be an idea to place this interface in-between the
per-cpu free page lists and the buddy allocator, so we can
move a batch of pages around at once and do the hinting in
a batched fashion ?

That way the overhead will be acceptable not just on S390
(where things are millicoded), but also on hypervisor based
virtualization like Xen.

Easy enough to pass a vector of pages to the hypervisor.

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