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References: <20230328061638.203420-1-yosryahmed@google.com> <20230328061638.203420-5-yosryahmed@google.com>
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From:   Shakeel Butt <shakeelb@google.com>
Date:   Tue, 28 Mar 2023 07:59:04 -0700
Message-ID: <CALvZod4zLhgjd3Tr5Qauz+OwF7Gj-NwDZPMpYAsxaMSUvu3F4g@mail.gmail.com>
Subject: Re: [PATCH v1 4/9] cgroup: rstat: add WARN_ON_ONCE() if flushing
 outside task context
To:     Yosry Ahmed <yosryahmed@google.com>
Cc:     Tejun Heo <tj@kernel.org>, Josef Bacik <josef@toxicpanda.com>,
        Jens Axboe <axboe@kernel.dk>,
        Zefan Li <lizefan.x@bytedance.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Michal Hocko <mhocko@kernel.org>,
        Roman Gushchin <roman.gushchin@linux.dev>,
        Muchun Song <muchun.song@linux.dev>,
        Andrew Morton <akpm@linux-foundation.org>,
        =?UTF-8?Q?Michal_Koutn=C3=BD?= <mkoutny@suse.com>,
        Vasily Averin <vasily.averin@linux.dev>,
        cgroups@vger.kernel.org, linux-block@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        bpf@vger.kernel.org
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On Mon, Mar 27, 2023 at 11:16=E2=80=AFPM Yosry Ahmed <yosryahmed@google.com=
> wrote:
>
> rstat flushing is too expensive to perform in irq context.
> The previous patch removed the only context that may invoke an rstat
> flush from irq context, add a WARN_ON_ONCE() to detect future
> violations, or those that we are not aware of.
>
> Signed-off-by: Yosry Ahmed <yosryahmed@google.com>

Reviewed-by: Shakeel Butt <shakeelb@google.com>