Re: [PATCH AUTOSEL 4.14 62/95] mm, memory_hotplug: initialize struct pages for the full memory section

Michal Hocko
2019-05-07T17:43:40Z

On Tue 07-05-19 10:36:55, Matthew Wilcox wrote:
> On Tue, May 07, 2019 at 07:32:24PM +0200, Michal Hocko wrote:
> > On Tue 07-05-19 13:18:06, Sasha Levin wrote:
> > > Michal, is there a testcase I can plug into kselftests to make sure we
> > > got this right (and don't regress)? We care a lot about memory hotplug
> > > working right.
> >
> > As said in other email. The memory hotplug tends to work usually. It
> > takes unexpected memory layouts which trigger corner cases. This makes
> > testing really hard.
>
> Can we do something with qemu? Is it flexible enough to hotplug memory
> at the right boundaries?

No idea. But I have tried to describe those layouts in the changelog so
if somebody can come up with a way to reproduce them under kvm/qemu I
would really appreciate that.

--
Michal Hocko
SUSE Labs