linux-kernel - RE: [linux-pm] [PATCH v4] PM: add statistics debugfs file for suspend to ram

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Date:	Wed, 10 Aug 2011 23:30:40 +0530
From:	"Mansoor, Illyas" <illyas.mansoor@...el.com>
To:	"Liu, ShuoX" <shuox.liu@...el.com>,
	"linux-pm@...ts.linux-foundation.org" 
	<linux-pm@...ts.linux-foundation.org>
CC:	"Brown, Len" <len.brown@...el.com>,
	"Yanmin_zhang@...ux.intel.com" <Yanmin_zhang@...ux.intel.com>,
	Greg KH <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [linux-pm] [PATCH v4] PM: add statistics debugfs file for
 suspend	to ram

> +struct suspend_stats suspend_stats;
>  static DEFINE_MUTEX(dpm_list_mtx);
>  static pm_message_t pm_transition;
> 
> @@ -464,8 +465,12 @@ void dpm_resume_noirq(pm_message_t state)
>  		mutex_unlock(&dpm_list_mtx);
> 
>  		error = device_resume_noirq(dev, state);
> -		if (error)
> +		if (error) {
> +			suspend_stats.failed_resume_noirq++;
> +			dpm_save_failed_step(SUSPEND_RESUME_NOIRQ);
> +			dpm_save_failed_dev(dev_name(dev));

Please make these statistics conditionally enabled, so on a production system
If we need to disable these statistics code we should be able to do so.

May be CONFIG_SUSPEND_STATS and convert those lines of code into function calls
That can be stubbed out when the config is not enabled.

-Illyas
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