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mm/memcg: set pos explicitly for reclaim and !reclaim 

During mem_cgroup_iter, there are two ways to get iteration position:
reclaim vs non-reclaim mode.

Let's do it explicitly for reclaim vs non-reclaim mode.

Link: https://lkml.kernel.org/r/20220330234719.18340-3-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Wei Yang 2022-04-28 23:15:58 -07:00 committed by akpm
parent 41555dadbf
commit 89d8330ccf
1 changed files with 2 additions and 3 deletions
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5
mm/memcontrol.c
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@ -1013,9 +1013,6 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
if (!root)
root = root_mem_cgroup;
if (prev && !reclaim)
pos = prev;
rcu_read_lock();
if (reclaim) {
@ -1041,6 +1038,8 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
*/
(void)cmpxchg(&iter->position, pos, NULL);
}
} else if (prev) {
pos = prev;
}
if (pos)