Re: 2.6.15-rt17

[Ingo Molnar]

* Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

> +	printk("| This is not a BUG\n");
> +	printk("| turn off CONFIG_DEBUG_STACK_OVERFLOW if you don't want this\n");

i added the patch below - we want to know about too high stack 
footprints.

	Ingo

Index: linux-rt.q/kernel/latency.c
===================================================================
--- linux-rt.q.orig/kernel/latency.c
+++ linux-rt.q/kernel/latency.c
@@ -414,10 +414,17 @@ static void show_stackframe(void)
 
 static notrace void __print_worst_stack(void)
 {
+	unsigned long fill_ratio;
 	printk("----------------------------->\n");
-	printk("| new stack-footprint maximum: %s/%d, %ld bytes (out of %ld bytes).\n",
+	printk("| new stack fill maximum: %s/%d, %ld bytes (out of %ld bytes).\n",
 		worst_stack_comm, worst_stack_pid,
 		MAX_STACK-worst_stack_left, (long)MAX_STACK);
+	fill_ratio = (MAX_STACK-worst_stack_left)*100/(long)MAX_STACK;
+	printk("| Stack fill ratio: %02ld%%", fill_ratio);
+	if (fill_ratio >= 90)
+		printk(" - BUG: that's quite high, please report this!\n");
+	else
+		printk(" - that's still OK, no need to report this.\n");
 	printk("------------|\n");
 
 	show_stackframe();
-
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