linux-kernel - Re: [PATCH] PM / sleep: Add pm_debug

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Message-ID: <20200328103949.GA16999@chenyu-office.sh.intel.com>
Date:   Sat, 28 Mar 2020 18:39:50 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-pm@...r.kernel.org, Pavel Machek <pavel@....cz>,
        linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH] PM / sleep: Add pm_debug_messages boot command control

Hi Randy,
On Fri, Mar 27, 2020 at 08:39:44AM -0700, Randy Dunlap wrote:
> On 3/27/20 4:11 AM, Chen Yu wrote:
> > Debug messages from the system suspend/hibernation infrastructure
> > is disabled by default, and can only be enabled after the system
> > has boot up via /sys/power/pm_debug_messages. This makes the hibernation
> > resume hard to track as it involves system boot up across hibernation.
> > There's no chance for software_resume() to track the resume process,
> > eg.
> > 
> > Turning on the pm_debug_messages during boot up by appending
> > 'pm_debug_message'.
> 
> Please add that command line option to
> Documentation/admin-guide/kernel-parameters.txt.
> Thanks.
> 
Thanks for pointing it out, I'll add it in the v2 patch.
Thanks,
Chenyu
> ~Randy
> Reported-by: Randy Dunlap <rdunlap@...radead.org>