Sender: Tejun Heo <htejun@gmail.com>
Date:   Thu, 6 Jan 2022 11:55:24 -1000
From:   Tejun Heo <tj@kernel.org>
To:     Wei Yang <richard.weiyang@gmail.com>
Cc:     lizefan.x@bytedance.com, hannes@cmpxchg.org,
        cgroups@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] cgroup/rstat: check updated_next only for root
Message-ID: <YddlTA/+sBAHGGYo@slm.duckdns.org>
References: <20211225000932.7253-1-richard.weiyang@gmail.com>
 <20211225000932.7253-2-richard.weiyang@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20211225000932.7253-2-richard.weiyang@gmail.com>
Precedence: bulk

On Sat, Dec 25, 2021 at 12:09:32AM +0000, Wei Yang wrote:
> After commit dc26532aed0a ("cgroup: rstat: punt root-level optimization to
> individual controllers"), each rstat on updated_children list has its
> ->updated_next not NULL.
> 
> This means we can remove the check on ->updated_next, if we make sure
> the subtree from @root is on list, which could be done by checking
> updated_next for root.
> 
> Signed-off-by: Wei Yang <richard.weiyang@gmail.com>

Applied to cgroup/for-5.17 w/ coding style fixes.

Thanks.

-- 
tejun