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Tue, 18 Dec 2018 05:07:54 -0800 (PST) Received: from localhost ([121.137.63.184]) by smtp.gmail.com with ESMTPSA id e188sm19101411pfg.130.2018.12.18.05.07.53 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 18 Dec 2018 05:07:53 -0800 (PST) From: Sergey Senozhatsky X-Google-Original-From: Sergey Senozhatsky Date: Tue, 18 Dec 2018 22:07:50 +0900 To: Borislav Petkov Cc: Sergey Senozhatsky , Peter Zijlstra , Petr Mladek , Steven Rostedt , Andrew Morton , linux-kernel@vger.kernel.org, Sergey Senozhatsky Subject: Re: [RFC][PATCH] printk: increase devkmsg write() ratelimit Message-ID: <20181218130750.GA665@tigerII.localdomain> References: <20181218091842.4996-1-sergey.senozhatsky@gmail.com> <20181218104812.GC15430@hirez.programming.kicks-ass.net> <20181218111701.GA32522@jagdpanzerIV> <20181218114709.GF7485@zn.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181218114709.GF7485@zn.tnic> User-Agent: Mutt/1.11.1 (2018-12-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On (12/18/18 12:47), Borislav Petkov wrote: [..] > > systemd[1]: Unmounting /home... > > systemd[1]: Unmounting Temporary Directory (/tmp)... > > systemd[1]: Unmounted Temporary Directory (/tmp). > > systemd[1]: Stopped target Swap. > > systemd[1]: Unmounted /boot. > > systemd[1]: Stopped File System Check on /dev/disk/by-uuid/a0737dff-e797-44f0-aea7-d0df1107ff63. > > systemd[1]: Stopped File System Check on /dev/disk/by-uuid/5d773b72-e200-4d11-a219-176d62a16d8d. > > systemd[1]: Unmounted /home. > > systemd[1]: Stopped File System Check on /dev/disk/by-uuid/35319ddc-9b92-4ab0-aaa4-9922db636a5e. > > systemd[1]: Unmounted /media/edev. > > systemd[1]: Stopped File System Check on /dev/disk/by-uuid/da00daaf-5601-4531-912e-bd69103b379d. > > systemd[1]: Unmounted /media/dump. > > systemd[1]: Reached target Unmount All Filesystems. > > systemd[1]: Stopped File System Check on /dev/disk/by-uuid/b52da2df-161b-4c33-b700-277d95b9672f. > > systemd[1]: Removed slice system-systemd\x2dfsck.slice. > > systemd[1]: Stopped target Local File Systems (Pre). > > systemd[1]: Stopped Create Static Device Nodes in /dev. > > systemd[1]: Stopped Create System Users. > > systemd[1]: Stopped Remount Root and Kernel File Systems. > > systemd[1]: Reached target Shutdown. > > systemd[1]: Reached target Final Step. > > systemd[1]: Starting Reboot... > > And we wanna see all those "very useful" messages in dmesg because...? This is right before shutdown. dmesg is not really available anymore. I can only guess why do they write it to devkmsg - to make it appear on the serial/net console, perhaps. Dunno. -ss