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From: Steven Rostedt <rostedt@goodmis.org>
To: Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
	akpm@linux-foundation.org, linux-mm@kvack.org,
	Peter Zijlstra <peterz@infradead.org>, Jan Kara <jack@suse.cz>,
	Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
	Tejun Heo <tj@kernel.org>,
	linux-kernel@vger.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Subject: Re: [PATCH] printk: Ratelimit messages printed by console drivers
Date: Fri, 20 Apr 2018 08:04:28 -0400	[thread overview]
Message-ID: <20180420080428.622a8e7f@gandalf.local.home> (raw)
In-Reply-To: <20180420091224.cotxcfycmtt2hm4m@pathway.suse.cz>

On Fri, 20 Apr 2018 11:12:24 +0200
Petr Mladek <pmladek@suse.com> wrote:

> Yes, my number was arbitrary. The important thing is that it was long
> enough. Or do you know about an console that will not be able to write
> 100 lines within one hour?

The problem is the way rate limit works. If you print 100 lines (or
1000) in 5 seconds, then you just stopped printing from that context
for 59 minutes and 55 seconds. That's a long time to block printing.

What happens if you had a couple of NMIs go off that takes up that
time, and then you hit a bug 10 minutes later from that context. You
just lost it.

This is a magnitude larger than any other user of rate limit in the
kernel. The most common time is 5 seconds. The longest I can find is 1
minute. You are saying you want to block printing from this context for
60 minutes!

That is HUGE! I don't understand your rational for such a huge number.
What data do you have to back that up with?

-- Steve

  reply	other threads:[~2018-04-20 12:04 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-13 12:47 Petr Mladek
2018-04-13 14:12 ` Steven Rostedt
2018-04-14  2:35   ` Sergey Senozhatsky
2018-04-16  1:47     ` Sergey Senozhatsky
2018-04-16  4:25       ` Sergey Senozhatsky
2018-04-19 12:53         ` Petr Mladek
2018-04-20  2:15           ` Sergey Senozhatsky
2018-04-20  9:12             ` Petr Mladek
2018-04-20 12:04               ` Steven Rostedt [this message]
2018-04-20 14:01                 ` Petr Mladek
2018-04-20 14:17                   ` Steven Rostedt
2018-04-20 14:19                     ` Steven Rostedt
2018-04-20 14:57                     ` Petr Mladek
2018-04-20 15:13                       ` Steven Rostedt
2018-04-23 10:32                         ` Petr Mladek
2018-04-23 11:36                           ` Steven Rostedt
2018-04-23 12:45                             ` Petr Mladek
2018-04-25  5:31                               ` Sergey Senozhatsky
2018-04-26  9:42                                 ` Petr Mladek
2018-04-27 10:22                                   ` Sergey Senozhatsky
2018-05-09 12:00                                     ` Petr Mladek
2018-05-09 12:59                                       ` Steven Rostedt
2019-02-26 10:24                                       ` Tetsuo Handa
2019-02-28  4:45                                         ` Sergey Senozhatsky
2018-04-23  5:21               ` Sergey Senozhatsky
2018-04-23 12:26                 ` Petr Mladek
2018-04-23 13:00                   ` Sergey Senozhatsky

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