linux-kernel - Re: [PATCH v5] power: new trace event to print device suspend and resume time

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Message-ID: <1374188013.3356.7.camel@gandalf.local.home>
Date:	Thu, 18 Jul 2013 18:53:33 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Shuah Khan <shuah.kh@...sung.com>
Cc:	len.brown@...el.com, pavel@....cz, rjw@...k.pl,
	gregkh@...uxfoundation.org, fweisbec@...il.com, mingo@...hat.com,
	paul.gortmaker@...driver.com, joe@...ches.com,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	shuahkhan@...il.com
Subject: Re: [PATCH v5] power: new trace event to print device suspend and
 resume time

On Thu, 2013-07-18 at 16:42 -0600, Shuah Khan wrote:

> +TRACE_EVENT(device_pm_report_time,
> +
> +	TP_PROTO(struct device *dev, const char *pm_ops, s64 ops_time,
> +		 char *pm_event_str, int error),
> +
> +	TP_ARGS(dev, pm_ops, ops_time, pm_event_str, error),
> +
> +	TP_STRUCT__entry(
> +		__string(device, dev_name(dev))
> +		__string(driver, dev_driver_string(dev))
> +		__string(parent, dev->parent ? dev_name(dev->parent) : "none")
> +		__string(pm_ops, pm_ops ? pm_ops : "none ")
> +		__string(pm_event_str, pm_event_str)
> +		__field(s64, ops_time)
> +		__field(int, error)
> +	),
> +
> +	TP_fast_assign(
> +		__assign_str(device, dev_name(dev));
> +		__assign_str(driver, dev_driver_string(dev));
> +		__assign_str(parent,
> +				dev->parent ? dev_name(dev->parent) : "none");

Have you tried using the temp variables? These macros expand to be
called multiple times.

-- Steve

> +		__assign_str(pm_ops, pm_ops ? pm_ops : "none ");
> +		__assign_str(pm_event_str, pm_event_str);
> +		__entry->ops_time = ops_time;
> +		__entry->error = error;
> +	),
> +
> +	/* ops_str has an extra space at the end */
> +	TP_printk("%s %s parent=%s state=%s ops=%snsecs=%lld err=%d",
> +		__get_str(driver), __get_str(device), __get_str(parent),
> +		__get_str(pm_event_str), __get_str(pm_ops),
> +		__entry->ops_time, __entry->error)
> +);
> +
>  DECLARE_EVENT_CLASS(wakeup_source,
>  
>  	TP_PROTO(const char *name, unsigned int state),


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