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

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Date:	Thu, 27 Nov 2008 15:58:25 +0100
From:	"Frédéric Weisbecker" <fweisbec@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Steven Rostedt" <rostedt@...dmis.org>,
	"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

2008/11/27 Ingo Molnar <mingo@...e.hu>:
>
> * Frédéric Weisbecker <fweisbec@...il.com> wrote:
>
>> >> >  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();
>> >> > ---------------------------------------------------------
>>
>> 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.
>>
>> I will set it as a default disabled option.
>
> lets keep it default-enabled, ok? It makes sense.

Ok.
BTW I understand why it is better to have a "pipe" if there is no time:

  0)             |    do_sync_read() {
  0)             |      sock_aio_read() {
  0)             |        __sock_recvmsg() {
  0)             |          security_socket_recvmsg() {

But I don't see why it is necessary to have one just after the time:

!0)  100.319 us |            cap_socket_recvmsg();

It appears to me as noise....
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