RE: [PATCH v3] migration: clear the memory region dirty bitmap when skipping free pages

[Wang, Wei W]

On Friday, July 23, 2021 4:17 PM, David Hildenbrand wrote:
> > On Friday, July 23, 2021 3:50 PM, David Hildenbrand wrote:
> >>
> >> Migration of a 8 GiB VM
> >> * within the same host
> >> * after Linux is up and idle
> >> * free page hinting enabled
> >> * after dirtying most VM memory using memhog
> >
> > Thanks for the tests!
> >
> > I think it would be better to test using idle guests (no memhog).
> > With memhog eating most of the guest free pages, it's likely no or very few
> free pages are reported during the test.
> 
> *After dirtying*. memhog is no longer running.
> 
> ... and also look again at the numbers how much memory we actually migrate :)
> 

OK, I was looking at the duplicate number, which was big in the idle guest case 
you posted before.
This looks good to me, the dirtied pages became free and got skipped as well. 
Thanks!

Best,
Wei