From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: Petr Mladek <pmladek@suse.com>, Nigel Croxon <ncroxon@redhat.com>,
"Theodore Y. Ts'o" <tytso@mit.edu>,
John Ogness <john.ogness@linutronix.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
John Stoffel <john@stoffel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
dm-devel@redhat.com, linux-serial@vger.kernel.org
Subject: Re: Serial console is causing system lock-up
Date: Fri, 8 Mar 2019 10:22:42 +0900 [thread overview]
Message-ID: <20190308012242.GA4063@jagdpanzerIV> (raw)
In-Reply-To: <alpine.LRH.2.02.1903070918110.6122@file01.intranet.prod.int.rdu2.redhat.com>
On (03/07/19 09:26), Mikulas Patocka wrote:
> On Thu, 7 Mar 2019, John Stoffel wrote:
>
> > The real problem is the disconnect between serial console speed and
> > capacity in bits/sec and that of the regular console. Serial, esp at
> > 9600 baud is just a slow and limited resource which needs to be
> > handled differently than a graphical console.
> >
> > I'm also big on ratelimiting messages, even critical warning
> > messages. Too much redundant info doesn't help anyone. And what a
> > subsystem thinks is critical, may not be critical to the system as a
> > whole.
>
> Perhaps a proper solution would be to drop excessive messages to serial
> console unless Oops or BUG has happened?
Technically, we can have a per-console loglevel configuration. We have
several use cases for this already. Slower consoles will filter out more
messages and print only ERR/CRIT/ALERT/EMERG.
dm-integrity uses WARN level, which is below ERR; so it seems that
per-console loglevel can do the trick.
-ss
next prev parent reply other threads:[~2019-03-08 1:22 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-06 14:27 Serial console is causing system lock-up Mikulas Patocka
2019-03-06 15:22 ` Petr Mladek
2019-03-06 16:07 ` Mikulas Patocka
2019-03-06 16:30 ` Theodore Y. Ts'o
2019-03-06 17:11 ` Mikulas Patocka
2019-03-06 22:19 ` Steven Rostedt
2019-03-06 22:43 ` John Ogness
2019-03-07 2:22 ` Sergey Senozhatsky
2019-03-07 8:17 ` John Ogness
2019-03-07 8:25 ` Sergey Senozhatsky
2019-03-07 8:34 ` John Ogness
2019-03-07 9:17 ` Sergey Senozhatsky
2019-03-07 10:37 ` John Ogness
2019-03-07 12:26 ` Sergey Senozhatsky
2019-03-07 12:54 ` Mikulas Patocka
2019-03-07 14:21 ` John Ogness
2019-03-07 15:35 ` Petr Mladek
2019-03-12 2:32 ` Sergey Senozhatsky
2019-03-12 8:17 ` John Ogness
2019-03-12 8:59 ` Sergey Senozhatsky
2019-03-12 10:05 ` Mikulas Patocka
2019-03-12 13:19 ` John Ogness
2019-03-12 13:44 ` Petr Mladek
2019-03-12 12:08 ` Petr Mladek
2019-03-12 15:19 ` John Ogness
2019-03-13 2:38 ` Sergey Senozhatsky
2019-03-13 8:43 ` John Ogness
2019-03-14 10:30 ` Sergey Senozhatsky
2019-03-07 14:08 ` John Stoffel
2019-03-07 14:26 ` Mikulas Patocka
2019-03-08 1:22 ` Sergey Senozhatsky [this message]
2019-03-08 1:39 ` Sergey Senozhatsky
2019-03-08 2:36 ` John Ogness
2019-03-07 15:16 ` Petr Mladek
2019-03-07 1:56 ` Sergey Senozhatsky
2019-03-07 13:12 ` Mikulas Patocka
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