linux-kernel - Re: [PATCH-block v3 2/2] blk-cgroup: Flush stats at blkgs destruction path

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Message-ID: <Y5jS825K7ej0jEV+@slm.duckdns.org>
Date:   Tue, 13 Dec 2022 09:30:59 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>, Josef Bacik <josef@...icpanda.com>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Michal Koutný <mkoutny@...e.com>,
        "Dennis Zhou (Facebook)" <dennisszhou@...il.com>
Subject: Re: [PATCH-block v3 2/2] blk-cgroup: Flush stats at blkgs
 destruction path

On Tue, Dec 13, 2022 at 01:44:46PM -0500, Waiman Long wrote:
> +	/*
> +	 * Flush all the non-empty percpu lockless lists so as to release
> +	 * the blkg references held by those lists which, in turn, may
> +	 * allow the blkgs to be freed and release their references to
> +	 * blkcg speeding up its freeing.
> +	 */

Can you mention the possible deadlock explicitly? This sounds more like an
optimization.

Thanks.

-- 
tejun