[PATCH 2/3] mm: swap: memcg: fix memcg stats for huge pages

[Shakeel Butt]

The commit 2262185c5b28 ("mm: per-cgroup memory reclaim stats") added
PGLAZYFREE, PGACTIVATE & PGDEACTIVATE stats for cgroups but missed
couple of places and PGLAZYFREE missed huge page handling. Fix that.
Also for PGLAZYFREE use the irq-unsafe function to update as the irq is
already disabled.

Fixes: 2262185c5b28 ("mm: per-cgroup memory reclaim stats")
Signed-off-by: Shakeel Butt <shake...@google.com>
---
 mm/swap.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/mm/swap.c b/mm/swap.c
index 3dbef6517cac..4eb179ee0b72 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -278,6 +278,7 @@ static void __activate_page(struct page *page, struct 
lruvec *lruvec,
        if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
                int file = page_is_file_lru(page);
                int lru = page_lru_base_type(page);
+               int nr_pages = hpage_nr_pages(page);
 
                del_page_from_lru_list(page, lruvec, lru);
                SetPageActive(page);
@@ -285,7 +286,8 @@ static void __activate_page(struct page *page, struct 
lruvec *lruvec,
                add_page_to_lru_list(page, lruvec, lru);
                trace_mm_lru_activate(page);
 
-               __count_vm_events(PGACTIVATE, hpage_nr_pages(page));
+               __count_vm_events(PGACTIVATE, nr_pages);
+               __count_memcg_events(lruvec_memcg(lruvec), PGACTIVATE, 
nr_pages);
                update_page_reclaim_stat(lruvec, file, 1);
        }
 }
@@ -540,8 +542,10 @@ static void lru_deactivate_file_fn(struct page *page, 
struct lruvec *lruvec,
                __count_vm_events(PGROTATED, nr_pages);
        }
 
-       if (active)
+       if (active) {
                __count_vm_events(PGDEACTIVATE, nr_pages);
+               __count_memcg_events(lruvec_memcg(lruvec), PGDEACTIVATE, 
nr_pages);
+       }
        update_page_reclaim_stat(lruvec, file, 0);
 }
 
@@ -551,13 +555,15 @@ static void lru_deactivate_fn(struct page *page, struct 
lruvec *lruvec,
        if (PageLRU(page) && PageActive(page) && !PageUnevictable(page)) {
                int file = page_is_file_lru(page);
                int lru = page_lru_base_type(page);
+               int nr_pages = hpage_nr_pages(page);
 
                del_page_from_lru_list(page, lruvec, lru + LRU_ACTIVE);
                ClearPageActive(page);
                ClearPageReferenced(page);
                add_page_to_lru_list(page, lruvec, lru);
 
-               __count_vm_events(PGDEACTIVATE, hpage_nr_pages(page));
+               __count_vm_events(PGDEACTIVATE, nr_pages);
+               __count_memcg_events(lruvec_memcg(lruvec), PGDEACTIVATE, 
nr_pages);
                update_page_reclaim_stat(lruvec, file, 0);
        }
 }
@@ -568,6 +574,7 @@ 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 = hpage_nr_pages(page);
 
                del_page_from_lru_list(page, lruvec,
                                       LRU_INACTIVE_ANON + active);
@@ -581,8 +588,8 @@ static void lru_lazyfree_fn(struct page *page, struct 
lruvec *lruvec,
                ClearPageSwapBacked(page);
                add_page_to_lru_list(page, lruvec, LRU_INACTIVE_FILE);
 
-               __count_vm_events(PGLAZYFREE, hpage_nr_pages(page));
-               count_memcg_page_event(page, PGLAZYFREE);
+               __count_vm_events(PGLAZYFREE, nr_pages);
+               __count_memcg_events(lruvec_memcg(lruvec), PGLAZYFREE, 
nr_pages);
                update_page_reclaim_stat(lruvec, 1, 0);
        }
 }
-- 
2.26.2.645.ge9eca65c58-goog