linux-kernel - [PATCH] softlockup: show irqtrace

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Date:	Wed, 25 Jun 2008 09:13:23 +0200
From:	Vegard Nossum <vegard.nossum@...il.com>
To:	Johannes Weiner <hannes@...urebad.de>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] softlockup: show irqtrace

Hi,

Ingo, can you please drop the "softirq softlockup debugging" patch and
apply this instead? This much, much prettier, reuses existing debugging
infrastructure, and is a lot more generic.

(Compile tested on allyesconfig, allnoconfig, allnoconfig + softlockup
debugging.)


Vegard


From: Vegard Nossum <vegard.nossum@...il.com>
Date: Wed, 25 Jun 2008 08:50:10 +0200
Subject: [PATCH] softlockup: show irqtrace

This patch adds some information about when interrupts were last
enabled and disabled to the output of the softlockup detector.

Signed-off-by: Vegard Nossum <vegard.nossum@...il.com>
---
 kernel/softlockup.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 01b6522..980f703 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -13,6 +13,7 @@
 #include <linux/delay.h>
 #include <linux/freezer.h>
 #include <linux/kthread.h>
+#include <linux/lockdep.h>
 #include <linux/notifier.h>
 #include <linux/module.h>
 
@@ -115,6 +116,7 @@ void softlockup_tick(void)
 	printk(KERN_ERR "BUG: soft lockup - CPU#%d stuck for %lus! [%s:%d]\n",
 			this_cpu, now - touch_timestamp,
 			current->comm, task_pid_nr(current));
+	print_irqtrace_events(current);
 	if (regs)
 		show_regs(regs);
 	else
-- 
1.5.4.1

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