linux-kernel - Re: [PATCH 4/5] tracing/fastboot: Add a time field on the sched

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Date:	Sat, 11 Oct 2008 19:50:33 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frédéric Weisbecker <fweisbec@...il.com>
cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [PATCH 4/5] tracing/fastboot: Add a time field on the sched_switch
 entry


On Sat, 11 Oct 2008, Fr?d?ric Weisbecker wrote:

> 2008/10/11 Steven Rostedt <rostedt@...dmis.org>:
> >> +
> >> +static enum print_line_t boot_trace_print_line(struct trace_iterator *iter)
> >> +{
> >> +     struct trace_entry *entry = iter->ent;
> >> +
> >> +     if (entry->type == TRACE_BOOT)
> >> +             return initcall_print_line(iter);
> >> +     if (entry->type == TRACE_CTX || entry->type == TRACE_WAKE)
> >> +             return sched_switch_print_line(iter);
> >>       return TRACE_TYPE_UNHANDLED;
> >>  }
> >>
> >> @@ -100,7 +159,7 @@ struct tracer boot_tracer __read_mostly =
> >>       .init           = boot_trace_init,
> >>       .reset          = reset_boot_trace,
> >>       .ctrl_update    = boot_trace_ctrl_update,
> >> -     .print_line     = initcall_print_line,
> >> +     .print_line     = boot_trace_print_line,
> >>  };
> >>
> >>  void trace_boot(struct boot_trace *it, initcall_t fn)
> >>
> >>
> >
> 
> Yes but this one doesn't seem to start at zero at the boot time.
> There is a big difference between those two ...

Even so, I disagree having the context switch tracer hold another 8 byte 
timestamp.  If you want to add something to the boot tracer, than fine. 
But not to something that other tracers use.

You can tap into the context switch trace_point too, and have that record 
a special trace entry for you instead.

-- Steve

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