linux-kernel - Re: [PATCH] PM: trace events for device pm callbacks

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Message-ID: <20140610171716.694c8414@gandalf.local.home>
Date:	Tue, 10 Jun 2014 17:17:16 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	todd.e.brandt@...ux.intel.com, rafael.j.wysocki@...el.com,
	linux-pm@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PM: trace events for device pm callbacks

On Tue, 10 Jun 2014 23:17:46 +0200
"Rafael J. Wysocki" <rjw@...ysocki.net> wrote:

> On Tuesday, June 10, 2014 07:31:22 AM Todd E Brandt wrote:
> > Adds two trace events which supply the same info that initcall_debug 
> > provides, but via ftrace instead of dmesg. The existing initcall_debug
> > calls require the pm_print_times_enabled var to be set (either via
> > sysfs or via the kernel cmd line). The new trace events provide all the
> > same info as the initcall_debug prints but with less overhead, and also
> > with coverage of device prepare and complete device callbacks.
> > 
> > These events replace the device_pm_report_time event (which has been
> > removed). device_pm_callback_start is called first and provides the device
> > and callback info. device_pm_callback_end is called after with the
> > device name and error info. The time and pid are gathered from the trace
> > data headers.
> > 
> > Signed-off-by: Todd Brandt <todd.e.brandt@...el.com>
> 
> Steve needs to see this (CCed).

The trace events look fine. Is there anything else you wanted me to
look at?

-- Steve

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