Re: [PATCH] mm: introduce MADV_CLR_HUGEPAGE

Michal Hocko
2017-05-31T12:06:01Z

On Wed 31-05-17 12:08:45, Mike Rapoport wrote:
> On Tue, May 30, 2017 at 12:39:30PM +0200, Michal Hocko wrote:
[...]
> > Also do you expect somebody else would use new madvise? What would be the
> > usecase?
>
> I can think of an application that wants to keep 4K pages to save physical
> memory for certain phase, e.g. until these pages are populated with very
> few data. After the memory usage increases, the application may wish to
> stop preventing khugepged from merging these pages, but it does not have
> strong inclination to force use of huge pages.

Well, is actually anybody going to do that?
--
Michal Hocko
SUSE Labs