linux-kernel - [patch] debugging feature: SysRq-Q to print timers

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Message-ID: <20061216075658.GA16116@elte.hu>
Date:	Sat, 16 Dec 2006 08:56:58 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [patch] debugging feature: SysRq-Q to print timers


* Adrian Bunk <bunk@...sta.de> wrote:

> On Thu, Dec 14, 2006 at 10:59:13PM -0800, Andrew Morton wrote:
> >...
> > Changes since 2.6.19-mm1:
> >...
> > +debugging-feature-proc-timer_list.patch
> > 
> >  Refreshed, refactored dynticks/hrtimer queue.
> >...
> 
> I'd assume sysrq_timer_list_show() wasn't intended to be unused?

correct, there's a sysrq side of it, but i forgot to send the patch to 
Andrew. Find it below.

	Ingo

----------------->
Subject: [patch] debugging feature: SysRq-Q to print timers
From: Ingo Molnar <mingo@...e.hu>

add SysRq-Q to print pending timers and other timer info.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 drivers/char/sysrq.c    |   14 +++++++++++++-
 include/linux/hrtimer.h |    3 +++
 2 files changed, 16 insertions(+), 1 deletion(-)

Index: linux/drivers/char/sysrq.c
===================================================================
--- linux.orig/drivers/char/sysrq.c
+++ linux/drivers/char/sysrq.c
@@ -36,6 +36,7 @@
 #include <linux/workqueue.h>
 #include <linux/kexec.h>
 #include <linux/irq.h>
+#include <linux/hrtimer.h>
 
 #include <asm/ptrace.h>
 #include <asm/irq_regs.h>
@@ -159,6 +160,17 @@ static struct sysrq_key_op sysrq_sync_op
 	.enable_mask	= SYSRQ_ENABLE_SYNC,
 };
 
+static void sysrq_handle_show_timers(int key, struct tty_struct *tty)
+{
+	sysrq_timer_list_show();
+}
+
+static struct sysrq_key_op sysrq_show_timers_op = {
+	.handler	= sysrq_handle_show_timers,
+	.help_msg	= "show-all-timers(Q)",
+	.action_msg	= "Show Pending Timers",
+};
+
 static void sysrq_handle_mountro(int key, struct tty_struct *tty)
 {
 	emergency_remount();
@@ -339,7 +351,7 @@ static struct sysrq_key_op *sysrq_key_ta
 	/* This will often be registered as 'Off' at init time */
 	NULL,				/* o */
 	&sysrq_showregs_op,		/* p */
-	NULL,				/* q */
+	&sysrq_show_timers_op,		/* q */
 	&sysrq_unraw_op,			/* r */
 	&sysrq_sync_op,			/* s */
 	&sysrq_showstate_op,		/* t */
Index: linux/include/linux/hrtimer.h
===================================================================
--- linux.orig/include/linux/hrtimer.h
+++ linux/include/linux/hrtimer.h
@@ -364,6 +364,9 @@ static inline void show_no_hz_stats(stru
 /* Bootup initialization: */
 extern void __init hrtimers_init(void);
 
+/* Show pending timers: */
+extern void sysrq_timer_list_show(void);
+
 /*
  * Timer-statistics info:
  */
-
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