linux-kernel - Re: [PATCH][v2] PM / sleep: Add pm_debug

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Message-ID: <20200406085843.GE31120@duo.ucw.cz>
Date:   Mon, 6 Apr 2020 10:58:43 +0200
From:   Pavel Machek <pavel@....cz>
To:     Chen Yu <yu.c.chen@...el.com>
Cc:     linux-pm@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH][v2] PM / sleep: Add pm_debug_messages boot command
 control

On Sun 2020-03-29 22:46:40, 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'.
> 
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Len Brown <lenb@...nel.org>
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: Randy Dunlap <rdunlap@...radead.org>
> Signed-off-by: Chen Yu <yu.c.chen@...el.com>
> ---
> v2: According to Randy's suggestion, add the command line
>     option to Documentation/admin-guide/kernel-parameters.txt
> ---
>  Documentation/admin-guide/kernel-parameters.txt | 3 +++
>  kernel/power/main.c                             | 7 +++++++
>  2 files changed, 10 insertions(+)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index c07815d230bc..105ec73743d7 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -3698,6 +3698,9 @@
>  			Override pmtimer IOPort with a hex value.
>  			e.g. pmtmr=0x508
>  
> +	pm_debug_message	[SUSPEND,KNL]
> +			Enable suspend/resume debug messages during boot up.
> +
>  	pnp.debug=1	[PNP]
>  			Enable PNP debug messages (depends on the
>  			CONFIG_PNP_DEBUG_MESSAGES option).  Change at

See?

So this should be pm.debug=1 for consistency?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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