linux-kernel - Re: [RFC PATCH 6/7] workingset: memcg: sleep when flushing stats in workingset

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Date:   Thu, 23 Mar 2023 11:50:40 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Yosry Ahmed <yosryahmed@...gle.com>
Cc:     Tejun Heo <tj@...nel.org>, Josef Bacik <josef@...icpanda.com>,
        Jens Axboe <axboe@...nel.dk>,
        Zefan Li <lizefan.x@...edance.com>,
        Michal Hocko <mhocko@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vasily Averin <vasily.averin@...ux.dev>,
        cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        bpf@...r.kernel.org
Subject: Re: [RFC PATCH 6/7] workingset: memcg: sleep when flushing stats in
 workingset_refault()

On Thu, Mar 23, 2023 at 04:00:36AM +0000, Yosry Ahmed wrote:
> In workingset_refault(), we call mem_cgroup_flush_stats_delayed() to
> flush stats within an RCU read section and with sleeping disallowed.
> Move the call to mem_cgroup_flush_stats_delayed() above the RCU read
> section and allow sleeping to avoid unnecessarily performing a lot of
> work without sleeping.
> 
> Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>
> ---
> 
> A lot of code paths call into workingset_refault(), so I am not
> generally sure at all whether it's okay to sleep in all contexts or not.
> Feedback here would be very helpful.

Yes, it's safe.