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

[KOSAKI Motohiro]

> Andrea Arcangeli wrote:
> 
> > Likely we need a cut-off point, if we detect it takes more than X
> > seconds to scan the whole active list, we start ignoring young bits,
> 
> We could just make this depend on the calculated inactive_ratio,
> which depends on the size of the list.
> 
> For small systems, it may make sense to make every accessed bit
> count, because the working set will often approach the size of
> memory.
> 
> On very large systems, the working set may also approach the
> size of memory, but the inactive list only contains a small
> percentage of the pages, so there is enough space for everything.
> 
> Say, if the inactive_ratio is 3 or less, make the accessed bit
> on the active lists count.

Sound reasonable. How do we confirm the idea correctness?
Wu, your X focus switching benchmark is sufficient test?



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