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Subject[PATCH 01/13] mm: use add_page_to_lru_list()
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This patch replaces the only open-coded lru list addition with
add_page_to_lru_list().

Before this patch, we have:
update_lru_size()
list_move()

After this patch, we have:
list_del()
add_page_to_lru_list()
update_lru_size()
list_add()

The only side effect is that page->lru is temporarily poisoned
after a page is deleted from its old list, which shouldn't be a
problem.

Signed-off-by: Yu Zhao <yuzhao@google.com>
---
mm/vmscan.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 9727dd8e2581..503fc5e1fe32 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1850,8 +1850,8 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
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);
@@ -1862,9 +1862,7 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
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, lru);

if (put_page_testzero(page)) {
__ClearPageLRU(page);
@@ -1878,6 +1876,7 @@ 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);
--
2.28.0.681.g6f77f65b4e-goog
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