The patch titled
Subject: mm/memcg: retrieve parent memcg from css.parent
has been added to the -mm tree. Its filename is
mm-memcg-retrieve-parent-memcg-from-cssparent.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-memcg-retrieve-parent-memcg-from-cssparent.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-memcg-retrieve-parent-memcg-from-cssparent.patch
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------------------------------------------------------
From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: mm/memcg: retrieve parent memcg from css.parent
The parent we get from page_counter is correct, while this is two
different hierarchy.
Let's retrieve the parent memcg from css.parent just like parent_cs(),
blkcg_parent(), etc.
Link: https://lkml.kernel.org/r/20220201004643.8391-2-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Reviewed-by: Roman Gushchin <guro@xxxxxx>
Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/memcontrol.h | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/include/linux/memcontrol.h~mm-memcg-retrieve-parent-memcg-from-cssparent
+++ a/include/linux/memcontrol.h
@@ -841,9 +841,7 @@ static inline struct mem_cgroup *lruvec_
*/
static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
{
- if (!memcg->memory.parent)
- return NULL;
- return mem_cgroup_from_counter(memcg->memory.parent, memory);
+ return mem_cgroup_from_css(memcg->css.parent);
}
static inline bool mem_cgroup_is_descendant(struct mem_cgroup *memcg,
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
mm-memcg-mem_cgroup_per_node-is-already-set-to-0-on-allocation.patch
mm-memcg-retrieve-parent-memcg-from-cssparent.patch
mm-page_alloc-add-same-penalty-is-enough-to-get-round-robin-order.patch
mm-page_alloc-add-penalty-to-local_node.patch
memcg-do-not-tweak-node-in-alloc_mem_cgroup_per_node_info.patch
