Re: [mm/page_alloc] 8212a964ee: vm-scalability.throughput 30.5% improvement

[Eric Dumazet]

On Sun, Mar 13, 2022 at 2:18 PM Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote:
>
> On Sun, Mar 13, 2022 at 02:10:12PM -0700, Eric Dumazet wrote:
> > @@ -3065,6 +3062,12 @@ static int rmqueue_bulk(struct zone *zone,
> > unsigned int order,
> >          */
> >         __mod_zone_page_state(zone, NR_FREE_PAGES, -(i << order));
> >         spin_unlock(&zone->lock);
> > +       list_for_each_entry_safe(page, tmp, list, lru) {
> > +               if (unlikely(check_pcp_refill(page))) {
> > +                       list_del(&page->lru);
> > +                       allocated--;
> > +               }
> > +       }
>
> ... you'd need to adjust __mod_zone_page_state() too, right?

Probably !
This was only to show the basic idea, as I said, not even compiled or tested :)