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Subject[PATCH 1/2] mm: use add_page_to_lru_list()/page_lru()/page_off_lru()
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This is a trivial but worth having clean-up patch. There should be
no side effects except page->lru is temporarily poisoned after it's
deleted but before it's added to the new list in move_pages_to_lru()
(which is not a problem).

Signed-off-by: Yu Zhao <yuzhao@google.com>
---
mm/swap.c | 4 +---
mm/vmscan.c | 14 ++++----------
2 files changed, 5 insertions(+), 13 deletions(-)

diff --git a/mm/swap.c b/mm/swap.c
index 40bf20a75278..2735ecf0f566 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -597,11 +597,9 @@ static void lru_lazyfree_fn(struct page *page, struct lruvec *lruvec,
{
if (PageLRU(page) && PageAnon(page) && PageSwapBacked(page) &&
!PageSwapCache(page) && !PageUnevictable(page)) {
- bool active = PageActive(page);
int nr_pages = thp_nr_pages(page);

- del_page_from_lru_list(page, lruvec,
- LRU_INACTIVE_ANON + active);
+ del_page_from_lru_list(page, lruvec, page_lru(page));
ClearPageActive(page);
ClearPageReferenced(page);
/*
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 99e1796eb833..b479ced26cd3 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1845,13 +1845,12 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
int nr_pages, nr_moved = 0;
LIST_HEAD(pages_to_free);
struct page *page;
- enum lru_list lru;

while (!list_empty(list)) {
page = lru_to_page(list);
VM_BUG_ON_PAGE(PageLRU(page), page);
+ list_del(&page->lru);
if (unlikely(!page_evictable(page))) {
- list_del(&page->lru);
spin_unlock_irq(&pgdat->lru_lock);
putback_lru_page(page);
spin_lock_irq(&pgdat->lru_lock);
@@ -1860,16 +1859,10 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
lruvec = mem_cgroup_page_lruvec(page, pgdat);

SetPageLRU(page);
- lru = page_lru(page);
-
- nr_pages = thp_nr_pages(page);
- update_lru_size(lruvec, lru, page_zonenum(page), nr_pages);
- list_move(&page->lru, &lruvec->lists[lru]);
+ add_page_to_lru_list(page, lruvec, page_lru(page));

if (put_page_testzero(page)) {
- __ClearPageLRU(page);
- __ClearPageActive(page);
- del_page_from_lru_list(page, lruvec, lru);
+ del_page_from_lru_list(page, lruvec, page_off_lru(page));

if (unlikely(PageCompound(page))) {
spin_unlock_irq(&pgdat->lru_lock);
@@ -1878,6 +1871,7 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
} else
list_add(&page->lru, &pages_to_free);
} else {
+ nr_pages = thp_nr_pages(page);
nr_moved += nr_pages;
if (PageActive(page))
workingset_age_nonresident(lruvec, nr_pages);
--
2.28.0.402.g5ffc5be6b7-goog
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