Re: [PATCH] mm: thp: remove use_zero_page sysfs knob

From: David Rientjes
Date: Tue Jul 24 2018 - 16:32:50 EST

On Tue, 24 Jul 2018, Kirill A. Shutemov wrote:

> > use_zero_page is currently a simple thp flag, meaning it rejects writes
> > where val != !!val, so perhaps it would be best to overload it with
> > additional options? I can imagine 0x2 defining persistent allocation so
> > that the hzp is not freed when the refcount goes to 0 and 0x4 defining if
> > the hzp should be per node. Implementing persistent allocation fixes our
> > concern with it, so I'd like to start there. Comments?
> Why not a separate files?

That works as well. I'll write a patch for persistent allocation first to
address our most immediate need.