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

[Steven Rostedt]

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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