Re: [Xen-devel] [PATCH v2 1/2] x86/mm: factor out the code for shattering an l3 PTE

["Xia, Hongyan" <hongyxia@xxxxxxxxxx>]

On Wed, 2019-12-11 at 11:10 +0000, Julien Grall wrote:
> Hi Hongyan,
> ...
> 
> While this involves more instructions, how often do we expect the
> code 
> to be called?
> 
> Cheers,
> 

I don't expect this to be called very often in the current Xen.
Although with direct map removal, a lot of the memory allocations
(mostly xenheap allocations) will be mapped and unmapped on-demand and
there is a much higher change of merging/shattering.

However, the series moved all PTEs from xenheap to domheap, and we
might see other things moved to domheap in the future, so we might not
have many things left on xenheap anyway.

Hongyan
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