-static noinline_for_stack void
-update_isolated_counts(struct mem_cgroup_zone *mz,
- struct list_head *page_list,
- unsigned long *nr_anon,
- unsigned long *nr_file)
-{
- struct zone *zone = mz->zone;
- unsigned int count[NR_LRU_LISTS] = { 0, };
- unsigned long nr_active = 0;
- struct page *page;
- int lru;
-
- /*
- * Count pages and clear active flags
- */
- list_for_each_entry(page, page_list, lru) {
- int numpages = hpage_nr_pages(page);
- lru = page_lru_base_type(page);
- if (PageActive(page)) {
- lru += LRU_ACTIVE;
- ClearPageActive(page);
- nr_active += numpages;
- }
- count[lru] += numpages;
- }
-
- preempt_disable();
- __count_vm_events(PGDEACTIVATE, nr_active);
-
- __mod_zone_page_state(zone, NR_ACTIVE_FILE,
- -count[LRU_ACTIVE_FILE]);
- __mod_zone_page_state(zone, NR_INACTIVE_FILE,
- -count[LRU_INACTIVE_FILE]);
- __mod_zone_page_state(zone, NR_ACTIVE_ANON,
- -count[LRU_ACTIVE_ANON]);
- __mod_zone_page_state(zone, NR_INACTIVE_ANON,
- -count[LRU_INACTIVE_ANON]);
-
- *nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON];
- *nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE];
-
- __mod_zone_page_state(zone, NR_ISOLATED_ANON, *nr_anon);
- __mod_zone_page_state(zone, NR_ISOLATED_FILE, *nr_file);
- preempt_enable();
-}
-
-/*
- * Returns true if a direct reclaim should wait on pages under writeback.
- *
- * If we are direct reclaiming for contiguous pages and we do not reclaim
- * everything in the list, try again and wait for writeback IO to complete.
- * This will stall high-order allocations noticeably. Only do that when really
- * need to free the pages under high memory pressure.
- */
-static inline bool should_reclaim_stall(unsigned long nr_taken,
- unsigned long nr_freed,
- int priority,
- struct scan_control *sc)
-{
- int lumpy_stall_priority;
-
- /* kswapd should not stall on sync IO */
- if (current_is_kswapd())
- return false;
-
- /* Only stall on lumpy reclaim */
- if (sc->reclaim_mode & RECLAIM_MODE_SINGLE)
- return false;
-
- /* If we have reclaimed everything on the isolated list, no stall */
- if (nr_freed == nr_taken)
- return false;
-
- /*
- * For high-order allocations, there are two stall thresholds.
- * High-cost allocations stall immediately where as lower
- * order allocations such as stacks require the scanning
- * priority to be much higher before stalling.
- */
- if (sc->order > PAGE_ALLOC_COSTLY_ORDER)
- lumpy_stall_priority = DEF_PRIORITY;
- else
- lumpy_stall_priority = DEF_PRIORITY / 3;
-
- return priority <= lumpy_stall_priority;
-}
-