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

[KOSAKI Motohiro]

(cc to memcg folks)

> Avi Kivity wrote:
> > On 08/06/2009 01:59 PM, Wu Fengguang wrote:
> 
> >> As a refinement, the static variable 'recent_all_referenced' could be
> >> moved to struct zone or made a per-cpu variable.
> > 
> > Definitely this should be made part of the zone structure, consider the 
> > original report where the problem occurs in a 128MB zone (where we can 
> > expect many pages to have their referenced bit set).
> 
> The problem did not occur in a 128MB zone, but in a 128MB cgroup.
> 
> Putting it in the zone means that the cgroup, which may have
> different behaviour from the rest of the zone, due to excessive
> memory pressure inside the cgroup, does not get the right
> statistics.

maybe, I heven't catch your point.

Current memcgroup logic also use recent_scan/recent_rotate statistics.
Isn't it enought?




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