linux-kernel - Re: [RFC][PATCH] Freezer: Make freezing failures less verbose by default

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Date:	Thu, 15 Nov 2007 00:25:31 +0000
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	pm list <linux-pm@...ts.linux-foundation.org>,
	Arkadiusz Miskiewicz <arekm@...en.pl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH] Freezer: Make freezing failures less verbose by default

Hi!

> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> Currently freezing failures are extremely verbose which sometimes is
> unnecessary and prevents the user from seeing which task could not be frozen.
> 
> Make them less verbose by default (ie. if CONFIG_PM_VERBOSE is unset).
> 

I don't think compile time option is right thing to do.

Dump just the stacks of the non-frozen tasks?

acpi_sleep=verbose?

Reorder dmesg so that you get backtraces, and _then_ list of the
tasks?

							Pavel

> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> ---
>  kernel/power/process.c |   11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> Index: linux-2.6/kernel/power/process.c
> ===================================================================
> --- linux-2.6.orig/kernel/power/process.c
> +++ linux-2.6/kernel/power/process.c
> @@ -163,6 +163,15 @@ static void cancel_freezing(struct task_
>  	}
>  }
>  
> +#ifdef CONFIG_PM_VERBOSE
> +static inline void freezer_show_state(void)
> +{
> +	show_state();
> +}
> +#else /* !CONFIG_PM_VERBOSE */
> +static inline void freezer_show_state(void) {}
> +#endif /* !CONFIG_PM_VERBOSE */
> +
>  static int try_to_freeze_tasks(int freeze_user_space)
>  {
>  	struct task_struct *g, *p;
> @@ -214,7 +223,7 @@ static int try_to_freeze_tasks(int freez
>  		printk(KERN_ERR "Freezing of tasks failed after %d.%02d seconds "
>  				"(%d tasks refusing to freeze):\n",
>  				elapsed_csecs / 100, elapsed_csecs % 100, todo);
> -		show_state();
> +		freezer_show_state();
>  		read_lock(&tasklist_lock);
>  		do_each_thread(g, p) {
>  			task_lock(p);

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