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Date: Fri, 7 Apr 2017 17:23:04 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Sergey Senozhatsky <sergey.senozhatsky@...il.com> Cc: Pavel Machek <pavel@....cz>, Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>, Jan Kara <jack@...e.cz>, "Eric W. Biederman" <ebiederm@...ssion.com>, Ye Xiaolong <xiaolong.ye@...el.com>, Steven Rostedt <rostedt@...dmis.org>, Petr Mladek <pmladek@...e.com>, Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, "Rafael J . Wysocki" <rjw@...ysocki.net>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby <jslaby@...e.com>, Len Brown <len.brown@...el.com>, linux-kernel@...r.kernel.org, lkp@...org Subject: Re: [printk] fbc14616f4: BUG:kernel_reboot-without-warning_in_test_stage On Sat, Apr 08, 2017 at 12:13:06AM +0900, Sergey Senozhatsky wrote: > On (04/07/17 14:44), Pavel Machek wrote: > [..] > > > [..] > > > > I believe "spend at most 2 seconds in printk(), then print a warning > > > > and offload" is a solution closer to what we had before. > > > > > > a warning here can be very noisy. > > > > Well, on normally-configured it should be ok. We don't commonly see > > printk problems... If it is too noisy, perhaps we should increase from > > 2 seconds, but I don't think it will be problem. > > we are looking at different typical setups :) serial console being 45 > seconds behind logbuf does not surprise me anymore. That does sound like you're doing something wrong and should look at reducing printk() more than anything else.
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