linux-kernel - Re: [PATCH v2 2/3] PM / sleep: Mark suspend/hibernation start and finish

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Date:   Thu, 20 Jul 2017 23:05:34 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Mark Salyzyn <salyzyn@...roid.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] PM / sleep: Mark suspend/hibernation start and finish

On Thu, Jul 20, 2017 at 7:49 PM, Mark Salyzyn <salyzyn@...roid.com> wrote:
> On 07/19/2017 06:38 PM, Rafael J. Wysocki wrote:
>>
>> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>>
>> Regardless of whether or not debug messages from the core system
>> suspend/hibernation code are enabled, it is useful to know when
>> system-wide transitions start and finish (or fail), so print "info"
>> messages at these points.
>>
>> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>> ---
>>
>> -> v2: Smiplified the messages as suggested by Mark.
>>
>> ---
>>   kernel/power/hibernate.c |    5 +++++
>>   kernel/power/suspend.c   |    2 ++
>>   2 files changed, 7 insertions(+)
>>
>> Index: linux-pm/kernel/power/hibernate.c
>> ===================================================================
>> --- linux-pm.orig/kernel/power/hibernate.c
>> +++ linux-pm/kernel/power/hibernate.c
>> @@ -692,6 +692,7 @@ int hibernate(void)
>>                 goto Unlock;
>>         }
>>   +     pr_info("hibernation entry\n");
>
> nit (minor): Many of the logs report a PM: prefix. Flipping coin that the 3
> characters provides any real gain is in your hands. My WAG is it would be
> nice to be able to do dmesg | grep PM:

Yeah, that's why pr_fmt() is defined in hibernate.c.  It is missing in
suspend.c ATM, though, hence the difference (but will be added there
too).

Thanks,
Rafael