On Tue, Sep 24, 2019 at 05:15:01PM +0200, Vlastimil Babka wrote:
> On 9/24/19 1:42 PM, Kirill A. Shutemov wrote:
> >> --- a/mm/page_owner.c
> >> +++ b/mm/page_owner.c
> >> @@ -24,6 +24,9 @@ struct page_owner {
> >> short last_migrate_reason;
> >> gfp_t gfp_mask;
> >> depot_stack_handle_t handle;
> >> +#ifdef CONFIG_DEBUG_PAGEALLOC
> >> + depot_stack_handle_t free_handle;
> >> +#endif
> >
> > I think it's possible to add space for the second stack handle at runtime:
> > adjust page_owner_ops->size inside the ->need().
>
> Uh that would complicate the code needlessly? The extra memory overhead
> isn't that much for a scenario that's already a debugging one
> (page_owner), I was more concerned about the cpu overhead, thus the
> static key.
Okay, fair enough.
--
Kirill A. Shutemov
