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

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Message-ID: <1740847.aJcviUsT1q@vostro.rjw.lan>
Date:	Tue, 10 Jun 2014 23:41:33 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Steven Rostedt <rostedt@...dmis.org>
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 Tuesday, June 10, 2014 05:17:16 PM Steven Rostedt wrote:
> 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?

No, that's all, thanks!

Rafael

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