Il 18/02/2014 11:51, Michael S. Tsirkin ha scritto:
> I agree it's either COW breaking or (similarly) locking pages that
> the guest hasn't touched yet.
>
> You can use prealloc or "-rt mlock=on" to avoid this problem.
>
> Paolo
Or the new shared flag - IIRC shared VMAs don't do COW either.
Only if the problem isn't locking and zeroing of untouched pages (also,
it is not upstream is it?).
Can you make a profile with perf?
Paolo
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