[patch 46/46] Add SysRq-Q to print timer_list debug info

Thomas Gleixner
2007-01-23T22:02:55Z

[-- Attachment #1: debugging-feature-sysrq-q-to-print-timers.patch --]
[-- Type: text/plain, Size: 2050 bytes --]

From: Ingo Molnar <mingo@elte.hu>

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

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

drivers/char/sysrq.c | 14 +++++++++++++-
include/linux/hrtimer.h | 3 +++
2 files changed, 16 insertions(+), 1 deletion(-)

Index: linux-2.6.20-rc4-mm1-bo/drivers/char/sysrq.c
===================================================================
--- linux-2.6.20-rc4-mm1-bo.orig/drivers/char/sysrq.c
+++ linux-2.6.20-rc4-mm1-bo/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();
@@ -336,7 +348,7 @@ static struct sysrq_key_op *sysrq_key_ta
/* o: 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-2.6.20-rc4-mm1-bo/include/linux/hrtimer.h
===================================================================
--- linux-2.6.20-rc4-mm1-bo.orig/include/linux/hrtimer.h
+++ linux-2.6.20-rc4-mm1-bo/include/linux/hrtimer.h
@@ -316,6 +316,9 @@ extern unsigned long ktime_divns(const k
# define ktime_divns(kt, div) (unsigned long)((kt).tv64 / (div))
#endif

+/* Show pending timers: */
+extern void sysrq_timer_list_show(void);
+
/*
* Timer-statistics info:
*/

--