linux-kernel - Re: [PATCH] tracing/function-branch-tracer: enhancements for the trace output

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Date:	Thu, 27 Nov 2008 10:31:13 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frédéric Weisbecker <fweisbec@...il.com>
cc:	Ingo Molnar <mingo@...e.hu>, Tim Bird <tim.bird@...sony.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] tracing/function-branch-tracer: enhancements for the
 trace output


On Thu, 27 Nov 2008, Fr?d?ric Weisbecker wrote:
> >
> >> > ---------------------------------------------------------
> >> > CPU)     cost   |  function
> >> > ---------------------------------------------------------
> >> >
> >> >  0)             |  sys_read() {
> >> >  0)    0.331 us |    fget_light();
> >> >  0)             |    vfs_read() {
> >> >  0)             |      rw_verify_area() {
> >> >  0)             |        security_file_permission() {
> >> >  0)    0.306 us |          cap_file_permission();
> >> >  0)    0.300 us |          cap_file_permission();
> >> >  0)    8.909 us |        }
> >> >  0)    0.993 us |      }
> >> >  0)   11.649 us |+   }
> >> >  0)             |    do_sync_read() {
> >> >  0)             |      sock_aio_read() {
> >> >  0)             |        __sock_recvmsg() {
> >> >  0)             |          security_socket_recvmsg() {
> >> >  0)  100.319 us |!           cap_socket_recvmsg();
> >> > ---------------------------------------------------------
> >
> > Hm?
> 
> I like it before the CPU number. The main purpose would be to scroll
> quickly the file and find the overheads. That would be easy if set as
> a first character.

No, please keep the CPU # first.  If anything, you will want to separate 
out the CPUs first. Otherwise you will see things all mixed up.

Hmm, I could also add a per cpu files.

 debugfs/tracing/buffers/cpu0
 debugfs/tracing/buffers/cpu1
 debugfs/tracing/buffers/cpu2
 debugfs/tracing/buffers/cpu3

That would print out the trace for a single CPU.

BTW, I'm really not here. I'm on holiday eating turkeys.

-- Steve

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