From: Johannes Weiner <hannes@cmpxchg.org>
To: Wei Yang <richard.weiyang@gmail.com>
Cc: mhocko@kernel.org, vdavydov.dev@gmail.com,
akpm@linux-foundation.org, cgroups@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH 2/3] mm/memcg: set pos to prev unconditionally
Date: Wed, 30 Mar 2022 08:08:49 -0400 [thread overview]
Message-ID: <YkRIUbEGHVIbVRNO@cmpxchg.org> (raw)
In-Reply-To: <20220330004750.fx4jr4bnehz4ynpf@master>
On Wed, Mar 30, 2022 at 12:47:50AM +0000, Wei Yang wrote:
> Something like this?
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index eed9916cdce5..5d433b79ba47 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -1005,9 +1005,6 @@ 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) {
> @@ -1033,6 +1030,8 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
> */
> (void)cmpxchg(&iter->position, pos, NULL);
> }
> + } else if (prev) {
> + pos = prev;
> }
>
> if (pos)
Yep!
next prev parent reply other threads:[~2022-03-30 12:08 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-25 0:34 [PATCH 0/3] mm/memcg: some cleanup for mem_cgroup_iter() Wei Yang
2022-02-25 0:34 ` [PATCH 1/3] mm/memcg: set memcg after css verified and got reference Wei Yang
2022-03-29 18:44 ` Johannes Weiner
2022-02-25 0:34 ` [PATCH 2/3] mm/memcg: set pos to prev unconditionally Wei Yang
2022-03-29 18:48 ` Johannes Weiner
2022-03-30 0:47 ` Wei Yang
2022-03-30 12:08 ` Johannes Weiner [this message]
2022-03-30 14:22 ` Wei Yang
2022-02-25 0:34 ` [PATCH 3/3] mm/memcg: move generation assignment and comparison together Wei Yang
2022-03-30 15:57 ` Johannes Weiner
2022-03-30 23:04 ` Wei Yang
2022-02-25 8:13 ` [PATCH 0/3] mm/memcg: some cleanup for mem_cgroup_iter() Michal Hocko
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