linux-kernel - Re: [PATCH 0/5] [RFC] binary reading of ftrace ring buffers

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Message-ID: <alpine.DEB.2.00.0903032222160.6862@gandalf.stny.rr.com>
Date:	Tue, 3 Mar 2009 22:23:57 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	linux-kernel@...r.kernel.org
cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Theodore Tso <tytso@....edu>,
	Arjan van de Ven <arjan@...radead.org>,
	Pekka Paalanen <pq@....fi>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Martin Bligh <mbligh@...gle.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jason Baron <jbaron@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	mrubin@...gle.com, md@...gle.com
Subject: Re: [PATCH 0/5] [RFC] binary reading of ftrace ring buffers


On Tue, 3 Mar 2009, Steven Rostedt wrote:

> 
> On Tue, 3 Mar 2009, Steven Rostedt wrote:
> 
> > Yes you can run multiple instances of this on different buffers.
> > 
> >  # ./rb-read.pl /tmp/buf-0
> > 
> > produces:
> > 
> >         0  [000]  7071.936459: (irq_handler_entry) irq 48
> >         0  [000]  7071.936462: (irq_handler_exit) irq 48 ret 1
> >         0  [000]  7071.988801: (sched_signal_send) sig: 14  task 0
> >         0  [000]  7071.988813: (sched_wakeup) task 0 success=1
> >         0  [000]  7071.988823: (sched_switch) prev 0:140 ==> next ntpd:6582272:0
> >      3303  [000]  7071.988916: (sched_switch) prev 0:120 ==> next swap:7497072:0
> >         0  [000]  7072.020370: (sched_wakeup) task 0 success=1
> >         0  [000]  7072.020407: (sched_switch) prev 0:140 ==> next even:808416116:0
> 
> My perl script is still a bit buggy, but you get the idea ;-)

Uploaded a fix:

         0  [000]  7071.936459: (irq_handler_entry) irq 48
         0  [000]  7071.936462: (irq_handler_exit) irq 48 ret 1
         0  [000]  7071.988801: (sched_signal_send) sig: 14  task 3303
         0  [000]  7071.988813: (sched_wakeup) task 3303 success=1
         0  [000]  7071.988823: (sched_switch) prev 0:140 ==> next ntpdpd:3303:120
      3303  [000]  7071.988916: (sched_switch) prev 3303:120 ==> next swapper:0:140
         0  [000]  7072.020370: (sched_wakeup) task 16 success=1
         0  [000]  7072.020407: (sched_switch) prev 0:140 ==> next events/0:16:115
        16  [000]  7071.936157: (sched_switch) prev 16:115 ==> next swapper:0:140

Much better.

I just used the same binary image. The bug was in the perl script.

-- Steve

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