> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1326,6 +1326,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
>
> for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
> struct page *page;
> + struct zone *zone;
> int nr_pages;
>
> page = lru_to_page(src);
> @@ -1333,8 +1334,11 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
>
> VM_BUG_ON_PAGE(!PageLRU(page), page);
>
> - if (page_zone_id(page) > sc->reclaim_idx)
> + zone = page_zone(page);
> + if (page_zone_id(page) > sc->reclaim_idx) {
> list_move(&page->lru, &pages_skipped);
> + __count_zone_vm_events(PGSCAN_SKIP, page_zone(page), 1);
> + }
The newly added zone is not used.
>
> switch (__isolate_lru_page(page, mode)) {
> case 0:
--
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