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From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
To: John Ogness <john.ogness@linutronix.de>
Cc: Andrea Parri <parri.andrea@gmail.com>,
	Petr Mladek <pmladek@suse.com>,
	Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
	Paul McKenney <paulmck@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	Steven Rostedt <rostedt@goodmis.org>,
	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH v4 0/4] printk: replace ringbuffer
Date: Tue, 14 Jul 2020 11:56:26 +0900	[thread overview]
Message-ID: <20200714025626.GD491026@jagdpanzerIV.localdomain> (raw)
In-Reply-To: <87o8onhf31.fsf@jogness.linutronix.de>

On (20/07/10 11:58), John Ogness wrote:
> 
> IMHO users of these sequence number interfaces need to see all the
> records individually and reassemble the LOG_CONT messages themselves if
> they want to. I believe that is the only sane path forward. To do this,
> the caller id will no longer be optional to the sequence number output
> since that is vital information to re-assemble the LOG_CONT messages.

Agreed. The caller id thus probably can be extended. Right now it only
tells us either we are in a process context (PID) or in something else.
This works sort of fine (I guess) because deeply nested printouts (printks
from NMI atop of process or irq printks) land in the deferred printk-safe
buffers, but things will change with the new logbuf (and after removal of
the logbuf_lock and per-CPU printk-safe buffers).

	-ss

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      parent reply	other threads:[~2020-07-14  2:56 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-07 14:59 [PATCH v4 0/4] printk: replace ringbuffer John Ogness
2020-07-07 14:59 ` [PATCH v4 1/4] crash: add VMCOREINFO macro to define offset in a struct declared by typedef John Ogness
2020-07-07 14:59 ` [PATCH v4 2/4] printk: add lockless ringbuffer John Ogness
2020-07-07 14:59 ` [PATCH v4 3/4] Revert "printk: lock/unlock console only for new logbuf entries" John Ogness
2020-07-08 14:34   ` Petr Mladek
2020-07-09  1:20   ` Sergey Senozhatsky
2020-07-07 14:59 ` [PATCH v4 4/4] printk: use the lockless ringbuffer John Ogness
2020-07-07 19:25   ` kernel test robot
2020-07-08 13:18     ` John Ogness
2020-07-08 14:35   ` Petr Mladek
2020-07-08 19:24   ` kernel test robot
2020-07-09  7:14   ` [printk] 18a2dc6982: ltp.kmsg01.fail kernel test robot
2020-07-09  8:33     ` Sergey Senozhatsky
2020-07-09 10:14       ` John Ogness
2020-07-09 10:59         ` Petr Mladek
2020-07-09 11:13           ` Petr Mladek
2020-07-09 11:17             ` John Ogness
2020-07-09 12:25               ` Petr Mladek
2020-07-09 13:07                 ` Sergey Senozhatsky
2020-07-09 14:41                   ` Petr Mladek
2020-07-08 15:20 ` [PATCH v4 0/4] printk: replace ringbuffer Petr Mladek
2020-07-09  7:03   ` John Ogness
2020-07-10  9:11     ` Petr Mladek
2020-07-10  9:52       ` John Ogness
2020-07-10 14:15         ` Petr Mladek
2020-07-14  2:56         ` Sergey Senozhatsky [this message]

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