linux-kernel - Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length record buffer

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Message-ID: <CA+1xoqf5YbkOJgQJWOgck0NpqGzGtxtHHJASZKHvwVuBzkKK6A@mail.gmail.com>
Date:	Sat, 12 May 2012 09:43:57 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Kay Sievers <kay@...y.org>, Greg KH <gregkh@...uxfoundation.org>,
	Yinghai Lu <yinghai@...nel.org>, Joe Perches <joe@...ches.com>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND 1/3] printk: convert byte-buffer to variable-length
 record buffer

On Fri, May 11, 2012 at 5:47 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> Btw, I'd also *love* to see some model (eventually - not necessarily
> now) where we could have the option of the time printouts being a bit
> different (rather than just on/off). It would be very nice if we had
> "relative" time printouts for events close together, so the rule could
> be something like:
>
>  - if time is same as last line, pad with empty
>
>  - if time is more than a minute from last one, show an absolute value
> of dd hh:mm:ss
>
>  - otherwise, show a relative value of +ss.mmmmmm
>
> So the on/off choice could be on/off/relative.
>
> Hmm?

So I got something like this:

# sleep 61 ; echo foo > /dev/kmsg ; sleep 61 ; echo bar > /dev/kmsg ;
sleep 5 ; echo zoot > /dev/kmsg ; sleep 10 ; echo foo > /dev/kmsg ;
echo bar > /dev/kmsg ; sleep 61 ; echo zoot > /dev/kmsg ; echo foo >
/dev/kmsg

[  673.222632] foo
[  734.315249] bar
[   +5.077527] zoot
[  +10.235225] foo
[   +0.002971] bar
[  810.883085] zoot
[   +0.003081] foo

If that looks right, I can send a patch once this printf overhaul is
stable, unless Kay already plans on doing it as part of his work.
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