Re: [RFC] respect the referenced bit of KVM guest pages?

[Rik van Riel]

Wu Fengguang wrote:
> On Wed, Aug 12, 2009 at 10:31:41PM +0800, Rik van Riel wrote:

> > For zones it is a fixed value, which is available in
> > /proc/zoneinfo
>
> On my 64bit desktop with 4GB memory:
>
>         DMA     inactive_ratio:    1
>         DMA32   inactive_ratio:    4
>         Normal  inactive_ratio:    1
>
> The biggest zone DMA32 has inactive_ratio=4. But I guess the
> referenced bit should not be ignored on this typical desktop
> configuration?

We need to ignore the referenced bit on active anon pages
on very large systems, but it could indeed be helpful to
respect the referenced bit on smaller systems.

I have no idea where the cut-off between them would be.

Maybe at inactive_ratio <= 4 ?

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