Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [PATCH] kernel/hung_task: Add a whitelist and blacklist
 mechanism.
To:     =?UTF-8?B?5ZGo5Lyg6auY?= <zhouchuangao@vivo.com>
Cc:     Ingo Molnar <mingo@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Juri Lelli <juri.lelli@redhat.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
        Daniel Bristot de Oliveira <bristot@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Kees Cook <keescook@chromium.org>,
        Michal Hocko <mhocko@suse.com>,
        "Guilherme G. Piccoli" <gpiccoli@canonical.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Lukas Bulwahn <lukas.bulwahn@gmail.com>,
        linux-kernel@vger.kernel.org
References: <AHgAiADIDmen--evL59Deart.3.1618798927815.Hmail.zhouchuangao@vivo.com>
From:   Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Message-ID: <5571ac2e-0d13-8623-a66a-414b5cc36de5@i-love.sakura.ne.jp>
Date:   Mon, 19 Apr 2021 11:38:36 +0900
User-Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:78.0) Gecko/20100101
 Thunderbird/78.9.1
MIME-Version: 1.0
In-Reply-To: <AHgAiADIDmen--evL59Deart.3.1618798927815.Hmail.zhouchuangao@vivo.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 8bit
Precedence: bulk

On 2021/04/19 11:22, 周传高 wrote:
> Some SOC vendors' drivers or user-mode processes may be in D state for a long time,
> and normally they do not configure HUNG TASK, so we need to ignore these tasks if
> we use HUNG TASK. 

Isn't that a sign that the quality of the drivers and user-mode processes is poor?
Wait should be killable/interruptible if possible (for better response to e.g. OOM-killer).