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

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Date:	Thu, 27 Nov 2008 16:09:52 +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>:
> if you look at it on a console where you look at code, it all looks
> like a straight line:
>
>
>  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)             ==> [ bash-2794 => cat-1234 ]
>                     -------------------------
>
>
> as if the code to the right was on a sheet of paper.
>
> If i understand you correct, are you suggesting this format:
>
>  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)             ==> [ bash-2794 => cat-1234 ]
>                     -------------------------
>
> i dont think that looks very good.


Hmm. I must confess that it draws a useful boundary for the eyes.
Ok.
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