linux-kernel - Re: [PATCH 0/3][RFC] tracing/rcu: Add _rcuidle() tracepoint to handle rcu_idle

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Message-ID: <20120207153710.GQ5941@linux.vnet.ibm.com>
Date:	Tue, 7 Feb 2012 07:37:10 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rob Herring <robherring2@...il.com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Kevin Hilman <khilman@...com>,
	Josh Triplett <josh@...htriplett.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [PATCH 0/3][RFC] tracing/rcu: Add _rcuidle() tracepoint to
 handle rcu_idle_exit() tracepoints

On Tue, Feb 07, 2012 at 09:56:53AM -0500, Steven Rostedt wrote:
> This is an RFC patch set for what I plan on pushing out to handle
> the tracepoints that are called from within rcu_idle_exit() sections.
> 
> The first patch is the tracepoint infrastructure,
> the second is the changes in x86
> the third is the changes in the cpuidle driver.
> 
> I see there's use cases in the arm arch, but as that is in flux, I'll
> let the arm folks deal with those.

Please note that the __rcudle() tracepoints depend on patch #45 from
my series (https://lkml.org/lkml/2012/2/3/471), though only for code
containing tracepoints that are called both from idle and non-idle.
I believe that the tracepoints in this patch series are only invoked
from idle, so should be no problem.

							Thanx, Paul

> -- Steve
> 
> 
> Steven Rostedt (3):
>       tracing/rcu: Add trace_##name##__rcuidle() static tracepoint for inside rcu_idle_exit() sections
>       x86/tracing: Denote the power and cpuidle tracepoints as _rcuidle()
>       cpuidle/tracing: Denote the tracepoints as being in rcu_idle_exit() section
> 
> ----
>  arch/x86/kernel/process.c  |   24 ++++++++++++------------
>  drivers/cpuidle/cpuidle.c  |    8 ++++----
>  include/linux/tracepoint.h |   20 ++++++++++++++++----
>  3 files changed, 32 insertions(+), 20 deletions(-)
> 
> --
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