/*
* This moves pages from the active list to
* the inactive list.
*
* We move them the other way when we see the
* reference bit on the page.
*/
static void refill_inactive(int nr_pages)
{
struct list_head * entry;
spin_lock(&pagemap_lru_lock);
entry = active_list.prev;
while (nr_pages && entry != &active_list) {
struct page * page;
page = list_entry(entry, struct page, lru);
entry = entry->prev;
if (PageTestandClearReferenced(page)) {
list_del(&page->lru);
list_add(&page->lru, &active_list);
continue;
}
nr_pages--;
del_page_from_active_list(page);
add_page_to_inactive_list(page);
SetPageReferenced(page);
}
spin_unlock(&pagemap_lru_lock);
}
/*
* This moves pages from the active list to
* the inactive list.
*
* We move them the other way when we see the
* reference bit on the page.
*/
static void refill_inactive(int nr_pages, zone_t * classzone)
{
struct list_head * entry;
unsigned long ratio;
ratio = (unsigned long) nr_pages * classzone->nr_active_pages / (((unsigned long) classzone->nr_inactive_pages * vm_lru_balance_ratio) + 1);
entry = active_list.prev;
while (ratio && entry != &active_list) {
struct page * page;
page = list_entry(entry, struct page, lru);
entry = entry->prev;
if (PageTestandClearReferenced(page)) {
list_del(&page->lru);
list_add(&page->lru, &active_list);
continue;
}
ratio--;
del_page_from_active_list(page);
add_page_to_inactive_list(page);
SetPageReferenced(page);
}
if (entry != &active_list) {
list_del(&active_list);
list_add(&active_list, entry);
}
}
// dyc: add all pages into inactive list
void __pagevec_lru_add(struct pagevec *pvec)
{
int i;
struct zone *zone = NULL;
// dyc: iterate all pages and add them to inactive list
for (i = 0; i < pagevec_count(pvec); i++) {
struct page *page = pvec->pages[i];
struct zone *pagezone = page_zone(page);
// dyc: lock/unlock until next zone
if (pagezone != zone) {
if (zone)
spin_unlock_irq(&zone->lru_lock);
zone = pagezone;
spin_lock_irq(&zone->lru_lock);
}
VM_BUG_ON(PageLRU(page));
// dyc: set pg LRU flag
SetPageLRU(page);
// dyc: add to inactive list and increase vm_stat
add_page_to_inactive_list(zone, page);
}
if (zone)
spin_unlock_irq(&zone->lru_lock);
release_pages(pvec->pages, pvec->nr, pvec->cold);
pagevec_reinit(pvec);
}
static inline void
putback_page_to_lru(struct zone *zone, struct page *page)
{
if (TestSetPageLRU(page))
BUG();
if (PageActive(page))
add_page_to_active_list(zone, page);
else
add_page_to_inactive_list(zone, page);
}
/*
* Add the passed pages to the LRU, then drop the caller's refcount
* on them. Reinitialises the caller's pagevec.
*/
void __pagevec_lru_add(struct pagevec *pvec)
{
int i;
struct zone *zone = NULL;
for (i = 0; i < pagevec_count(pvec); i++) {
struct page *page = pvec->pages[i];
struct zone *pagezone = page_zone(page);
if (pagezone != zone) {
if (zone)
spin_unlock_irq(&zone->lru_lock);
zone = pagezone;
spin_lock_irq(&zone->lru_lock);
}
if (TestSetPageLRU(page))
BUG();
add_page_to_inactive_list(zone, page);
}
if (zone)
spin_unlock_irq(&zone->lru_lock);
release_pages(pvec->pages, pvec->nr, pvec->cold);
pagevec_reinit(pvec);
}
void lru_cache_add(struct page * page)
{
add_page_to_inactive_list(page);
}
