mm: move mem_cgroup_uncharge out of __page_cache_release()

A later patch makes THP deferred split shrinker memcg aware, but it needs
page->mem_cgroup information in THP destructor, which is called after
mem_cgroup_uncharge() now.

So move mem_cgroup_uncharge() from __page_cache_release() to compound page
destructor, which is called by both THP and other compound pages except
HugeTLB.  And call it in __put_single_page() for single order page.

Link: http://lkml.kernel.org/r/1565144277-36240-3-git-send-email-yang.shi@linux.alibaba.com
Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
Suggested-by: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Qian Cai <cai@lca.pw>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a41436c..3334a76 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -670,6 +670,7 @@ out:
 
 void free_compound_page(struct page *page)
 {
+       mem_cgroup_uncharge(page);
        __free_pages_ok(page, compound_order(page));
 }
 

diff --git a/mm/swap.c b/mm/swap.c
index 0226c53..784dc16 100644 (file)
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -71,12 +71,12 @@ static void __page_cache_release(struct page *page)
                spin_unlock_irqrestore(&pgdat->lru_lock, flags);
        }
        __ClearPageWaiters(page);
-       mem_cgroup_uncharge(page);
 }
 
 static void __put_single_page(struct page *page)
 {
        __page_cache_release(page);
+       mem_cgroup_uncharge(page);
        free_unref_page(page);
 }
 

diff --git a/mm/vmscan.c b/mm/vmscan.c
index c27dd62..c4ef868 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1487,10 +1487,9 @@ free_it:
                 * Is there need to periodically free_page_list? It would
                 * appear not as the counts should be low
                 */
-               if (unlikely(PageTransHuge(page))) {
-                       mem_cgroup_uncharge(page);
+               if (unlikely(PageTransHuge(page)))
                        (*get_compound_page_dtor(page))(page);
-               } else
+               else
                        list_add(&page->lru, &free_pages);
                continue;
 
@@ -1911,7 +1910,6 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
 
                        if (unlikely(PageCompound(page))) {
                                spin_unlock_irq(&pgdat->lru_lock);
-                               mem_cgroup_uncharge(page);
                                (*get_compound_page_dtor(page))(page);
                                spin_lock_irq(&pgdat->lru_lock);
                        } else