From: Petr Mladek <pmladek@suse.com>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Peter Zijlstra <peterz@infradead.org>,
"ksummit-discuss@lists.linuxfoundation.org"
<ksummit-discuss@lists.linuxfoundation.org>
Subject: Re: [Ksummit-discuss] [TECH TOPIC] printk redesign
Date: Fri, 23 Jun 2017 10:49:40 +0200 [thread overview]
Message-ID: <20170623084940.GH23337@pathway.suse.cz> (raw)
In-Reply-To: <20170621160951.GA20550@lunn.ch>
On Wed 2017-06-21 18:09:51, Andrew Lunn wrote:
> > 7. Unreliable time stamps and sorting messages
> >
> > The current extra buffers (cont, printk_safe, printk_safe_nmi)
> > makes this worse. The timestamp is added later.
>
> All you need is a sequence number. Since you have the CPU number
> already, it could be a per CPU atomic. And you probably don't even
> need to sort the output, if the sequence number is part of the
> output.
Yup.
> How bad is the reordering? Would a sequence space of 256 be
> enough?
That is very good question and we need a feedback here. I am not sure
what fixes are worth the complexity.
Best Regards,
Petr
next prev parent reply other threads:[~2017-06-23 8:49 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-19 5:21 Sergey Senozhatsky
2017-06-19 6:22 ` Hannes Reinecke
2017-06-19 14:39 ` Steven Rostedt
2017-06-19 15:20 ` Andrew Lunn
2017-06-19 15:54 ` Hannes Reinecke
2017-06-19 16:17 ` Andrew Lunn
2017-06-19 16:23 ` Mark Brown
2017-06-20 15:58 ` Sergey Senozhatsky
2017-06-20 16:44 ` Luck, Tony
2017-06-20 17:11 ` Sergey Senozhatsky
2017-06-20 17:27 ` Mark Brown
2017-06-20 23:28 ` Steven Rostedt
2017-06-21 7:17 ` Hannes Reinecke
2017-06-21 11:12 ` Sergey Senozhatsky
2017-06-22 14:06 ` Steven Rostedt
2017-06-23 5:43 ` Sergey Senozhatsky
2017-06-23 13:09 ` Steven Rostedt
2017-06-21 12:23 ` Petr Mladek
2017-06-21 14:18 ` Andrew Lunn
2017-06-23 8:46 ` Petr Mladek
2017-06-21 16:09 ` Andrew Lunn
2017-06-23 8:49 ` Petr Mladek [this message]
2017-07-19 7:35 ` David Woodhouse
2017-07-20 7:53 ` Sergey Senozhatsky
2017-06-20 16:09 ` Sergey Senozhatsky
2017-06-19 16:26 ` Steven Rostedt
2017-06-19 16:35 ` Andrew Lunn
2017-06-24 11:14 ` Mauro Carvalho Chehab
2017-06-24 14:06 ` Andrew Lunn
2017-06-24 22:42 ` Steven Rostedt
2017-06-24 23:21 ` Andrew Lunn
2017-06-24 23:26 ` Linus Torvalds
2017-06-24 23:40 ` Steven Rostedt
2017-06-26 11:16 ` Sergey Senozhatsky
2017-06-24 23:48 ` Al Viro
2017-06-25 1:29 ` Andrew Lunn
2017-06-25 2:41 ` Linus Torvalds
2017-06-26 8:46 ` Jiri Kosina
2017-07-19 7:59 ` David Woodhouse
2017-06-20 15:56 ` Sergey Senozhatsky
2017-06-20 18:45 ` Daniel Vetter
2017-06-21 9:29 ` Petr Mladek
2017-06-21 10:15 ` Sergey Senozhatsky
2017-06-22 13:42 ` Daniel Vetter
2017-06-22 13:48 ` Daniel Vetter
2017-06-23 9:07 ` Bartlomiej Zolnierkiewicz
2017-06-27 13:06 ` Sergey Senozhatsky
2017-06-23 5:20 ` Sergey Senozhatsky
2017-06-19 23:46 ` Josh Triplett
2017-06-20 8:24 ` Arnd Bergmann
2017-06-20 14:36 ` Steven Rostedt
2017-06-20 15:26 ` Sergey Senozhatsky
2017-06-22 16:35 ` David Howells
2017-07-19 6:24 ` Sergey Senozhatsky
2017-07-19 6:25 ` Sergey Senozhatsky
2017-07-19 7:26 ` Daniel Vetter
2017-07-20 5:19 ` Sergey Senozhatsky
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