[merged] mm-memcontrol-change-ug-dummy_page-only-if-memcg-changed.patch removed from -mm tree

[merged] mm-memcontrol-change-ug-dummy_page-only-if-memcg-changed.patch removed from -mm tree

[akpm]

The patch titled
     Subject: mm: memcontrol: change ug->dummy_page only if memcg changed
has been removed from the -mm tree.  Its filename was
     mm-memcontrol-change-ug-dummy_page-only-if-memcg-changed.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Muchun Song <songmuchun@bytedance.com>
Subject: mm: memcontrol: change ug->dummy_page only if memcg changed

Just like assignment to ug->memcg, we only need to update ug->dummy_page
if memcg changed.  So move it to there.  This is a very small
optimization.

Link: https://lkml.kernel.org/r/20210319163821.20704-5-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memcontrol.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/memcontrol.c~mm-memcontrol-change-ug-dummy_page-only-if-memcg-changed
+++ a/mm/memcontrol.c
@@ -6843,6 +6843,7 @@ static void uncharge_page(struct page *p
 			uncharge_gather_clear(ug);
 		}
 		ug->memcg = page_memcg(page);
+		ug->dummy_page = page;
 
 		/* pairs with css_put in uncharge_batch */
 		css_get(&ug->memcg->css);
@@ -6856,7 +6857,6 @@ static void uncharge_page(struct page *p
 	else
 		ug->pgpgout++;
 
-	ug->dummy_page = page;
 	page->memcg_data = 0;
 	css_put(&ug->memcg->css);
 }
_

Patches currently in -mm which might be from songmuchun@bytedance.com are