linux-kernel - Re: [PATCH 2/2] tracing/fastboot: Use the ring-buffer timestamp for initcall entries

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Date:	Wed, 12 Nov 2008 10:25:48 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] tracing/fastboot: Use the ring-buffer timestamp
	for initcall entries


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> Impact: Split the boot tracer entries in two parts: call and return
> 
> Now that we are using the sched tracer from the boot tracer, we want 
> to use the same timestamp than the ring-buffer to have consistent 
> time captures between sched events and initcall events. So we get 
> rid of the old time capture by the boot tracer and split the 
> initcall events in two parts: call and return. This way we have the 
> ring buffer timestamp of both.
> 
> There is an example of a trace in attachment.
> 
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> ---
>  include/trace/boot.h      |   31 ++++++++---
>  init/main.c               |   32 ++++++------
>  kernel/trace/trace.h      |   17 ++++--
>  kernel/trace/trace_boot.c |  123 ++++++++++++++++++++++++++++++++++-----------
>  4 files changed, 144 insertions(+), 59 deletions(-)

applied	to tip/tracing/fastboot, thanks	Frederic! 

one small detail, do we need these messages in the boot tracer:

  ##### CPU 1 buffer started ####

they are helpful for latency traces but might be confusing for boot 
traces. (they lose their attraction after having seen a dozen of them)

	Ingo
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