From: Chen Yu <yu.c.chen@intel.com>
To: Randy Dunlap <rdunlap@infradead.org>
Cc: linux-pm@vger.kernel.org, Pavel Machek <pavel@ucw.cz>,
linux-kernel@vger.kernel.org,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <lenb@kernel.org>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: Re: [PATCH] PM / sleep: Add pm_debug_messages boot command control
Date: Sat, 28 Mar 2020 18:39:50 +0800 [thread overview]
Message-ID: <20200328103949.GA16999@chenyu-office.sh.intel.com> (raw)
In-Reply-To: <a9843786-e7da-2c3c-30e2-c4887e9af4c6@infradead.org>
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@infradead.org>
prev parent reply other threads:[~2020-03-28 10:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-27 11:11 [PATCH] PM / sleep: Add pm_debug_messages boot command control Chen Yu
2020-03-27 15:39 ` Randy Dunlap
2020-03-28 10:39 ` Chen Yu [this message]
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