Re: [PATCH 2/6] ksm: dont allow overlap memory addresses registrations.

[Rik van Riel]

Izik Eidus wrote:
> Rik van Riel wrote:
> > Izik Eidus wrote:
> > > subjects say it all.
> >
> > Not a very useful commit message.
> >
> > This makes me wonder, though.
> >
> > What happens if a user mmaps a 30MB memory region, registers it
> > with KSM and then unmaps the middle 10MB?
>
> User cant break 30MB into smaller one.

The user can break up the underlying VMAs though.

I am just wondering out loud if we really want two
VMA-like objects in the kernel, the VMA itself and
a separate KSM object, with different semantics.

Maybe this is fine, but I do think it's a question
that needs to be thought about.

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