Re: [PATCH v4 3/3] KVM: x86/mmu: Add detailed page size stats

From: Mingwei Zhang
Date: Mon Aug 09 2021 - 19:39:56 EST

Hi Jim,

No, I don't think 512G is supported. So, I will remove the
'pages_512G' metric in my next version.


On Mon, Aug 9, 2021 at 3:26 PM Jim Mattson <jmattson@xxxxxxxxxx> wrote:
> On Mon, Aug 2, 2021 at 9:46 PM Mingwei Zhang <mizhang@xxxxxxxxxx> wrote:
> >
> > Existing KVM code tracks the number of large pages regardless of their
> > sizes. Therefore, when large page of 1GB (or larger) is adopted, the
> > information becomes less useful because lpages counts a mix of 1G and 2M
> > pages.
> >
> > So remove the lpages since it is easy for user space to aggregate the info.
> > Instead, provide a comprehensive page stats of all sizes from 4K to 512G.
> There is no such thing as a 512GiB page, is there? If this is an
> attempt at future-proofing, why not go to 256TiB?