The patch titled
Subject: mm/memcg: set memcg after css verified and got reference
has been added to the -mm tree. Its filename is
mm-memcg-set-memcg-after-css-verified-and-got-reference.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-memcg-set-memcg-after-css-verified-and-got-reference.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-memcg-set-memcg-after-css-verified-and-got-reference.patch
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------------------------------------------------------
From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: mm/memcg: set memcg after css verified and got reference
Patch series "mm/memcg: some cleanup for mem_cgroup_iter()".
This patch (of 3):
Instead of resetting memcg when css is either not verified or has no
reference, we can set it after these are processed.
No functional change, just simplified the code a little.
Link: https://lkml.kernel.org/r/20220225003437.12620-2-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 11 +++--------
1 file changed, 3 insertions(+), 8 deletions(-)
--- a/mm/memcontrol.c~mm-memcg-set-memcg-after-css-verified-and-got-reference
+++ a/mm/memcontrol.c
@@ -1089,15 +1089,10 @@ struct mem_cgroup *mem_cgroup_iter(struc
* is provided by the caller, so we know it's alive
* and kicking, and don't take an extra reference.
*/
- memcg = mem_cgroup_from_css(css);
-
- if (css == &root->css)
- break;
-
- if (css_tryget(css))
+ if (css == &root->css || css_tryget(css)) {
+ memcg = mem_cgroup_from_css(css);
break;
-
- memcg = NULL;
+ }
}
if (reclaim) {
_
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-memcg-set-memcg-after-css-verified-and-got-reference.patch
mm-memcg-set-pos-to-prev-unconditionally.patch
mm-memcg-move-generation-assignment-and-comparison-together.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
