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SubjectRE: [PATCH RFC kernel] balloon: speed up inflating/deflating process
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> > > Suggestion to address all above comments:
> > > 1. allocate a bunch of pages and link them up,
> > > calculating the min and the max pfn.
> > > if max-min exceeds the allocated bitmap size,
> > > tell host.
> >
> > I am not sure if it works well in some cases, e.g. The allocated pages
> > are across a wide range and the max-min > limit is very frequently to be
> true.
> > Then, there will be many times of virtio transmission and it's bad for
> > performance improvement. Right?
>
> It's a tradeoff for sure. Measure it, see what the overhead is.
>

Hi MST,

I have measured the performance when using a 32K page bitmap, and inflate the balloon to 3GB
of an idle guest with 4GB RAM.

Now:
total inflating time: 338ms
the count of virtio data transmission: 373
the call count of madvise: 865

before:
total inflating time: 175ms
the count of virtio data transmission: 1
the call count of madvise: 42

Maybe the result will be worse if the guest is not idle, or the guest has more RAM.
Do you want more data?

Is it worth to do that?

Liang

> >
> > > 2. limit allocated bitmap size to something reasonable.
> > > How about 32Kbytes? This is 256kilo bit in the map, which comes
> > > out to 1Giga bytes of memory in the balloon.
> >
> > So, even the VM has 1TB of RAM, the page bitmap will take 32MB of
> memory.
> > Maybe it's better to use a big page bitmap the save the pages
> > allocated by balloon, and split the big page bitmap to 32K bytes unit, then
> transfer one unit at a time.
>
> How is this different from what I said?
>
> >
> > Should we use a page bitmap to replace 'vb->pages' ?
> >
> > How about rolling back to use PFNs if the count of requested pages is a
> small number?
> >
> > Liang
>
> That's why we have start pfn. you can use that to pass even a single page
> without a lot of overhead.
>
> > > > --
> > > > 1.9.1
> > > --
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