linux-kernel - Re: [PATCH trace-cmd V5 2/6] trace-cmd/listen: Introduce trace-msg protocol (protocol v2)

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Date:	Tue, 19 May 2015 23:12:02 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
	yrl.pp-manager.tt@...achi.com,
	Aaron Fabbri <aaronx.j.fabbri@...el.com>,
	linux-kernel@...r.kernel.org, Divya Vyas <edivya.vyas@...il.com>
Subject: Re: [PATCH trace-cmd V5 2/6] trace-cmd/listen: Introduce trace-msg
 protocol (protocol v2)

On Mon, 22 Dec 2014 12:47:50 -0500
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:

> Introduce new trace-msg protocol (protocol V2) for more
> flexible messaging. V1 protocol which is currently used
> by trace-cmd server and client, is based on a simple
> text messages. It is impossible to extend the protocol
> without breaking backward compatibility. The V2 protocol
> introduced by this patch is a binary message-based protocol
> and it is able to extend by just adding message tags.
> 
> <How to test>
> [1] Backward compatibility checks
>  We need to test backward compatibility of this patch for old
>  trace-cmds(client/server). So, this patch was tested for [2]
>  command checks in following 3 types:
> 
> 	<client>	<server>
> 	  new		  old
> 	  old		  new
> 	  new		  new
> 
> [2] Command checks
> - server (common)
> 	# trace-cmd listen -p 12345
> 
> 1) record
> - client
> 	# trace-cmd record -e sched -N <server IP>:12345
> 	^C
> 
> 2) record + multiple buffers
> - client
> 	# trace-cmd record -B foo -e sched -N <server IP>:12345
> 	^C
> 
> 3) extract
> - client
> 	# ./trace-cmd start -e sched
> 	# sleep 5
> 	# ./trace-cmd stop
> 	# ./trace-cmd extract -N <server IP>:12345
> 
> 4) extract + snapshot
> - client
> 	# ./trace-cmd start -e sched
> 	# sleep 5
> 	# ./trace-cmd snapshot -s
> 	# ./trace-cmd stop
> 	# ./trace-cmd extract -N <server IP>:12345 -s
> 
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
>

Hi Masami,

Is this a rewrite of Yoshihiro's work? I would like to keep the From:
from him if he did the initial work, and add both of your
signed-off-bys.

Note, I did pull in some of his patches to a temp branch and extended
on them. I'll look to see if I have to modify this code as well.

Thanks!

-- Steve

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