[RFC][PATCH] Freezer: Make freezing failures less verbose by default

[RFC][PATCH] Freezer: Make freezing failures less verbose by default

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rjw@sisk.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).

Signed-off-by: Rafael J. Wysocki <rjw@sisk.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);

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

[Pavel Machek]

Hi!

> From: Rafael J. Wysocki <rjw@sisk.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@sisk.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

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

[Johannes Berg]

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> > Currently freezing failures are extremely verbose which sometimes is
> > unnecessary and prevents the user from seeing which task could not be frozen.

That's a good thing.

> I don't think compile time option is right thing to do.
> 
> Dump just the stacks of the non-frozen tasks?

That's harder to do because there's no support right now.

> acpi_sleep=verbose?

ewwww

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

That'd be good too.

johannes

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