RE: [Xen-devel] Re: [Patch] the interface of invalidating qemu mapcache

["Li, Xin B" <xin.b.li@xxxxxxxxx>]

>
>The balloon driver is likely to free up pages scattered all over the
memory
>map. Since it does this in batches it will probably be easiest to
simply
>blow the entire mapcache at the end of a batch. This will make your
patch a
>lot smaller!
>

Yes, it's much simpler if we just blow the entire mapcache each time we
release memory to Xen or get some back from Xen.
-Xin 


>Making effective use of 1MB selective zapping will actually be hard for
the
>balloon driver -- either it will make a zap request for each page it
frees
>(which will be slow) or it will need to maintain a bitmap it fills in
during
>its batched work which it then scans-and-zaps at the end. It is
probably not
>worth the effort.
>

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