Commit 3e8bcb36 authored by Liu Shixin's avatar Liu Shixin
Browse files

mm/memcg: introduce memcg_has_children to check memcg 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8S9BY


CVE: NA

--------------------------------

Re-introduce memcg_has_children to check whether a memcg is leaf.

Signed-off-by: default avatarLiu Shixin <liushixin2@huawei.com>
parent abe1a624

include/linux/memcontrol.h

+11 −0
Original line number Diff line number Diff line
@@ -1220,6 +1220,17 @@ unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order, 
int memcg_get_swap_type(struct folio *folio);

void memcg_remove_swapfile(int type);



/* Test whether @memcg has children, dead or alive. */

static inline bool memcg_has_children(struct mem_cgroup *memcg)

{

	bool ret;



	rcu_read_lock();

	ret = css_next_child(NULL, &memcg->css);

	rcu_read_unlock();

	return ret;

}



#else /* CONFIG_MEMCG */



#define MEM_CGROUP_ID_SHIFT	0