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To: Sergey Senozhatsky Cc: Michal Hocko , Petr Mladek , Steven Rostedt , linux-kernel@vger.kernel.org, Dmitry Safonov , Yafang Shao References: <20200425004609.GE8982@jagdpanzerIV.localdomain> <842ff40b-a232-6098-4333-996a3033b30a@i-love.sakura.ne.jp> <20200427062117.GC486@jagdpanzerIV.localdomain> <4dae86af-1d9a-f5a8-cff6-aa91ec038a79@i-love.sakura.ne.jp> <20200428121828.GP28637@dhcp22.suse.cz> <20200428154532.GU28637@dhcp22.suse.cz> <20200429142106.GG28637@dhcp22.suse.cz> <20200513062652.GM413@jagdpanzerIV.localdomain> From: Tetsuo Handa Message-ID: Date: Wed, 13 May 2020 16:58:48 +0900 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200513062652.GM413@jagdpanzerIV.localdomain> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020/05/13 15:26, Sergey Senozhatsky wrote: > Yes, but this looks like it's the consumer of the messages who > decides what to filter and what not to. rsyslog, dmesg, etc. > will have different filtering policies. It's not like the kernel > decides what to hide and what to show. If would compare this to > NO_CONSOLES, then NO_CONSOLES does a different thing after all. I just showed an example that changing dump_tasks() messages from KERN_INFO to KERN_DEBUG is not an option. If dump_tasks() were using KERN_DEBUG, the consumer of the messages will have to receive all KERN_DEBUG messages, which needlessly contains uninterested messages. If dump_tasks() allows use of NO_CONSOLES (via e.g. sysctl switch), the consumer does not need to receive KERN_DEBUG messages. What is wrong with adding NO_CONSOLES ?