[merged mm-stable] memcontrol-introduce-the-new-mem_cgroup_scan_tasks.patch removed from -mm tree

[merged mm-stable] memcontrol-introduce-the-new-mem_cgroup_scan_tasks.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: memcontrol: introduce the new mem_cgroup_scan_tasks()
has been removed from the -mm tree.  Its filename was
     memcontrol-introduce-the-new-mem_cgroup_scan_tasks.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: xu xin <xu.xin16@zte.com.cn>
Subject: memcontrol: introduce the new mem_cgroup_scan_tasks()
Date: Thu, 1 May 2025 04:13:50 +0000

Introduce a new mem_cgroup_scan_tasks function that strictly iterates
processes only within the current memcgroup, aligning its behavior with
its name.

Link: https://lkml.kernel.org/r/20250501041350.3324212-1-xu.xin16@zte.com.cn
Signed-off-by: xu xin <xu.xin16@zte.com.cn>
Cc: David Hildenbrand <david@redhat.com>
Cc: Haonan Chen <chen.haonan2@zte.com.cn>
Cc: Wang Yaxin <wang.yaxin@zte.com.cn>
Cc: Yang Yang <yang.yang29@zte.com.cn>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/memcontrol.h |    7 +++++++
 mm/memcontrol.c            |   24 ++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

--- a/include/linux/memcontrol.h~memcontrol-introduce-the-new-mem_cgroup_scan_tasks
+++ a/include/linux/memcontrol.h
@@ -795,6 +795,8 @@ struct mem_cgroup *mem_cgroup_iter(struc
 				   struct mem_cgroup *,
 				   struct mem_cgroup_reclaim_cookie *);
 void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
+void mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
+			   int (*)(struct task_struct *, void *), void *arg);
 void mem_cgroup_tree_scan_tasks(struct mem_cgroup *memcg,
 			   int (*)(struct task_struct *, void *), void *arg);
 
@@ -1290,6 +1292,11 @@ static inline void mem_cgroup_iter_break
 {
 }
 
+static inline void mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
+		int (*fn)(struct task_struct *, void *), void *arg)
+{
+}
+
 static inline void mem_cgroup_tree_scan_tasks(struct mem_cgroup *memcg,
 		int (*fn)(struct task_struct *, void *), void *arg)
 {
--- a/mm/memcontrol.c~memcontrol-introduce-the-new-mem_cgroup_scan_tasks
+++ a/mm/memcontrol.c
@@ -1165,6 +1165,30 @@ static void invalidate_reclaim_iterators
 						dead_memcg);
 }
 
+/* *
+ * mem_cgroup_scan_tasks - iterate over tasks of only this memory cgroup.
+ * @memcg: the specified memory cgroup.
+ * @fn: function to call for each task
+ * @arg: argument passed to @fn
+ *
+ * Unlike mem_cgroup_tree_scan_tasks(), this function only iterate over
+ * these tasks attached to @memcg, not including any of its descendants
+ * memcg. And this could be called for the root memory cgroup.
+ */
+void mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
+			  int (*fn)(struct task_struct *, void *), void *arg)
+{
+	int ret = 0;
+	struct css_task_iter it;
+	struct task_struct *task;
+
+	css_task_iter_start(&memcg->css, CSS_TASK_ITER_PROCS, &it);
+	while (!ret && (task = css_task_iter_next(&it)))
+		ret = fn(task, arg);
+
+	css_task_iter_end(&it);
+}
+
 /**
  * mem_cgroup_tree_scan_tasks - iterate over tasks of a memory cgroup hierarchy
  * @memcg: hierarchy root
_

Patches currently in -mm which might be from xu.xin16@zte.com.cn are