Re: [patch 1/8] Page host virtual assist: unused / free pages.

[Nick Piggin <nickpiggin@yahoo.com.au>]

Himanshu Raj wrote:
> [patch 1/8] Page host virtual assist: 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. That allows the host to avoid the paging of guest pages without
> meaningful content. The host can "forget" the page content and provide
> a fresh frame containing zeroes instead.
> 
> To communicate the two page states "unused" and "stable" to the host
> two architecture defined primitives page_hva_set_unused() and
> page_hva_set_stable() are introduced, which are used in the page
> allocator.
> 
> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

This seems reasonable to me. But again, there is no reason for the
mm to know about this "hva" thing.

We already have arch_free_page. Can't you introduce an arch_alloc_page
and use those?

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