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[PATCH] hangcheck-timer: Update to 0.9.0.

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I recently realized that the in-kernel copy of hangcheck-timer was quite
stale.  Here's the latest.  It adds support for s390, ppc64, and ia64 too.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Joel Becker 2005-05-01 08:59:08 -07:00 committed by Linus Torvalds
parent a40920b42a
commit 696f9486d0
2 changed files with 96 additions and 10 deletions
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2
drivers/char/Kconfig
View File

@ -982,7 +982,7 @@ config MAX_RAW_DEVS
config HANGCHECK_TIMER
tristate "Hangcheck timer"
depends on X86_64 || X86
depends on X86_64 || X86 || IA64 || PPC64 || ARCH_S390
help
The hangcheck-timer module detects when the system has gone
out to lunch past a certain margin. It can reboot the system

104
drivers/char/hangcheck-timer.c
View File

@ -3,7 +3,7 @@
*
* Driver for a little io fencing timer.
*
* Copyright (C) 2002 Oracle Corporation. All rights reserved.
* Copyright (C) 2002, 2003 Oracle. All rights reserved.
*
* Author: Joel Becker <joel.becker@oracle.com>
*
@ -44,11 +44,14 @@
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/reboot.h>
#include <linux/smp_lock.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/uaccess.h>
#include <linux/sysrq.h>
#define VERSION_STR "0.5.0"
#define VERSION_STR "0.9.0"
#define DEFAULT_IOFENCE_MARGIN 60 /* Default fudge factor, in seconds */
#define DEFAULT_IOFENCE_TICK 180 /* Default timer timeout, in seconds */
@ -56,18 +59,89 @@
static int hangcheck_tick = DEFAULT_IOFENCE_TICK;
static int hangcheck_margin = DEFAULT_IOFENCE_MARGIN;
static int hangcheck_reboot; /* Defaults to not reboot */
static int hangcheck_dump_tasks; /* Defaults to not dumping SysRQ T */
/* Driver options */
/* options - modular */
module_param(hangcheck_tick, int, 0);
MODULE_PARM_DESC(hangcheck_tick, "Timer delay.");
module_param(hangcheck_margin, int, 0);
MODULE_PARM_DESC(hangcheck_margin, "If the hangcheck timer has been delayed more than hangcheck_margin seconds, the driver will fire.");
module_param(hangcheck_reboot, int, 0);
MODULE_PARM_DESC(hangcheck_reboot, "If nonzero, the machine will reboot when the timer margin is exceeded.");
module_param(hangcheck_dump_tasks, int, 0);
MODULE_PARM_DESC(hangcheck_dump_tasks, "If nonzero, the machine will dump the system task state when the timer margin is exceeded.");
MODULE_AUTHOR("Joel Becker");
MODULE_AUTHOR("Oracle");
MODULE_DESCRIPTION("Hangcheck-timer detects when the system has gone out to lunch past a certain margin.");
MODULE_LICENSE("GPL");
MODULE_VERSION(VERSION_STR);
/* options - nonmodular */
#ifndef MODULE
static int __init hangcheck_parse_tick(char *str)
{
int par;
if (get_option(&str,&par))
hangcheck_tick = par;
return 1;
}
static int __init hangcheck_parse_margin(char *str)
{
int par;
if (get_option(&str,&par))
hangcheck_margin = par;
return 1;
}
static int __init hangcheck_parse_reboot(char *str)
{
int par;
if (get_option(&str,&par))
hangcheck_reboot = par;
return 1;
}
static int __init hangcheck_parse_dump_tasks(char *str)
{
int par;
if (get_option(&str,&par))
hangcheck_dump_tasks = par;
return 1;
}
__setup("hcheck_tick", hangcheck_parse_tick);
__setup("hcheck_margin", hangcheck_parse_margin);
__setup("hcheck_reboot", hangcheck_parse_reboot);
__setup("hcheck_dump_tasks", hangcheck_parse_dump_tasks);
#endif /* not MODULE */
#if defined(CONFIG_X86) || defined(CONFIG_X86_64)
# define HAVE_MONOTONIC
# define TIMER_FREQ 1000000000ULL
#elif defined(CONFIG_ARCH_S390)
/* FA240000 is 1 Second in the IBM time universe (Page 4-38 Principles of Op for zSeries */
# define TIMER_FREQ 0xFA240000ULL
#elif defined(CONFIG_IA64)
# define TIMER_FREQ ((unsigned long long)local_cpu_data->itc_freq)
#elif defined(CONFIG_PPC64)
# define TIMER_FREQ (HZ*loops_per_jiffy)
#endif
#ifdef HAVE_MONOTONIC
extern unsigned long long monotonic_clock(void);
#else
static inline unsigned long long monotonic_clock(void)
{
# ifdef __s390__
/* returns the TOD. see 4-38 Principles of Op of zSeries */
return get_clock();
# else
return get_cycles();
# endif /* __s390__ */
}
#endif /* HAVE_MONOTONIC */
/* Last time scheduled */
@ -78,7 +152,6 @@ static void hangcheck_fire(unsigned long);
static struct timer_list hangcheck_ticktock =
TIMER_INITIALIZER(hangcheck_fire, 0, 0);
extern unsigned long long monotonic_clock(void);
static void hangcheck_fire(unsigned long data)
{
@ -92,6 +165,12 @@ static void hangcheck_fire(unsigned long data)
tsc_diff = (cur_tsc + (~0ULL - hangcheck_tsc)); /* or something */
if (tsc_diff > hangcheck_tsc_margin) {
if (hangcheck_dump_tasks) {
printk(KERN_CRIT "Hangcheck: Task state:\n");
#ifdef CONFIG_MAGIC_SYSRQ
handle_sysrq('t', NULL, NULL);
#endif /* CONFIG_MAGIC_SYSRQ */
}
if (hangcheck_reboot) {
printk(KERN_CRIT "Hangcheck: hangcheck is restarting the machine.\n");
machine_restart(NULL);
@ -108,10 +187,16 @@ static int __init hangcheck_init(void)
{
printk("Hangcheck: starting hangcheck timer %s (tick is %d seconds, margin is %d seconds).\n",
VERSION_STR, hangcheck_tick, hangcheck_margin);
hangcheck_tsc_margin = hangcheck_margin + hangcheck_tick;
hangcheck_tsc_margin *= 1000000000;
#if defined (HAVE_MONOTONIC)
printk("Hangcheck: Using monotonic_clock().\n");
#elif defined(__s390__)
printk("Hangcheck: Using TOD.\n");
#else
printk("Hangcheck: Using get_cycles().\n");
#endif /* HAVE_MONOTONIC */
hangcheck_tsc_margin =
(unsigned long long)(hangcheck_margin + hangcheck_tick);
hangcheck_tsc_margin *= (unsigned long long)TIMER_FREQ;
hangcheck_tsc = monotonic_clock();
mod_timer(&hangcheck_ticktock, jiffies + (hangcheck_tick*HZ));
@ -123,6 +208,7 @@ static int __init hangcheck_init(void)
static void __exit hangcheck_exit(void)
{
del_timer_sync(&hangcheck_ticktock);
printk("Hangcheck: Stopped hangcheck timer.\n");
}
module_init(hangcheck_init);