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Subject[patch] enable uptime display > 497 days on 32 bit (2/2)
Debug option to move jiffies wrap forward to five minutes after boot.
Rediffed to 2.4.19-pre2 and added a printk to make the option visible
in dmesg (suggested by Andreas Dilger)

Tim


--- linux-2.4.19-pre2-j64/include/linux/timex.h Fri Mar 1 01:01:05 2002
+++ linux-2.4.19-pre2-j64-dbg/include/linux/timex.h Fri Mar 1 02:39:09 2002
@@ -53,6 +53,13 @@

#include <asm/param.h>

+#ifdef CONFIG_DEBUG_JIFFIESWRAP
+ /* Make the jiffies counter wrap around sooner. */
+# define INITIAL_JIFFIES ((unsigned long)(-300*HZ))
+#else
+# define INITIAL_JIFFIES 0
+#endif
+
/*
* The following defines establish the engineering parameters of the PLL
* model. The HZ variable establishes the timer interrupt frequency, 100 Hz
--- linux-2.4.19-pre2-j64/kernel/timer.c Fri Mar 1 00:45:04 2002
+++ linux-2.4.19-pre2-j64-dbg/kernel/timer.c Fri Mar 1 03:00:07 2002
@@ -65,9 +65,9 @@

extern int do_setitimer(int, struct itimerval *, struct itimerval *);

-unsigned long volatile jiffies;
+unsigned long volatile jiffies = INITIAL_JIFFIES;
#ifdef NEEDS_JIFFIES64
- static unsigned long jiffies_hi, jiffies_last;
+ static unsigned long jiffies_hi, jiffies_last = INITIAL_JIFFIES;
static spinlock_t jiffies64_lock = SPIN_LOCK_UNLOCKED;
#endif

@@ -122,10 +122,21 @@
for (i = 0; i < TVR_SIZE; i++)
INIT_LIST_HEAD(tv1.vec + i);

+#ifdef CONFIG_DEBUG_JIFFIESWRAP
+ tv1.index = INITIAL_JIFFIES & TVR_MASK;
+ tv2.index = (INITIAL_JIFFIES >> TVR_BITS) & TVN_MASK;
+ tv3.index = (INITIAL_JIFFIES >> (TVR_BITS + TVN_BITS)) & TVN_MASK;
+ tv4.index = (INITIAL_JIFFIES >> (TVR_BITS + 2*TVN_BITS)) & TVN_MASK;
+ tv5.index = (INITIAL_JIFFIES >> (TVR_BITS + 3*TVN_BITS)) & TVN_MASK;
+
+ printk(KERN_NOTICE "Set up jiffies counter to wrap in %ld seconds.\n",
+ (-(long)jiffies)/HZ);
+#endif
+
init_jiffieswrap_timer();
}

-static unsigned long timer_jiffies;
+static unsigned long timer_jiffies = INITIAL_JIFFIES;

static inline void internal_add_timer(struct timer_list *timer)
{
@@ -646,7 +657,7 @@
}

/* jiffies at the most recent update of wall time */
-unsigned long wall_jiffies;
+unsigned long wall_jiffies = INITIAL_JIFFIES;

/*
* This spinlock protect us from races in SMP while playing with xtime. -arca
--- linux-2.4.19-pre2-j64/fs/proc/array.c Fri Mar 1 00:05:24 2002
+++ linux-2.4.19-pre2-j64-dbg/fs/proc/array.c Fri Mar 1 01:38:50 2002
@@ -366,7 +366,7 @@
nice,
0UL /* removed */,
task->it_real_value,
- (unsigned long long)(task->start_time),
+ (unsigned long long)(task->start_time) - INITIAL_JIFFIES,
vsize,
mm ? mm->rss : 0, /* you might want to shift this left 3 */
task->rlim[RLIMIT_RSS].rlim_cur,
--- linux-2.4.19-pre2-j64/fs/proc/proc_misc.c Fri Mar 1 01:32:28 2002
+++ linux-2.4.19-pre2-j64-dbg/fs/proc/proc_misc.c Fri Mar 1 01:38:50 2002
@@ -164,7 +164,7 @@
unsigned long uptime_remainder, idle_remainder;
int len;

- uptime = get_jiffies64();
+ uptime = get_jiffies64() - INITIAL_JIFFIES;
uptime_remainder = (unsigned long) do_div(uptime, HZ);
idle = get_idle64();
idle_remainder = (unsigned long) do_div(idle, HZ);
@@ -297,7 +297,7 @@
{
int i, len;
extern unsigned long total_forks;
- u64 jif = get_jiffies64();
+ u64 jif = get_jiffies64() - INITIAL_JIFFIES;
unsigned int sum = 0, user = 0, nice = 0, system = 0;
int major, disk;

--- linux-2.4.19-pre2-j64/kernel/info.c Fri Mar 1 00:05:24 2002
+++ linux-2.4.19-pre2-j64-dbg/kernel/info.c Fri Mar 1 01:38:50 2002
@@ -22,7 +22,7 @@
memset((char *)&val, 0, sizeof(struct sysinfo));

cli();
- uptime = get_jiffies64();
+ uptime = get_jiffies64() - INITIAL_JIFFIES;
do_div(uptime, HZ);
val.uptime = (unsigned long) uptime;

--- linux-2.4.19-pre2-j64/Documentation/Configure.help Thu Feb 28 23:52:03 2002
+++ linux-2.4.19-pre2-j64-dbg/Documentation/Configure.help Fri Mar 1 01:38:50 2002
@@ -24081,6 +24081,14 @@
of the BUG call as well as the EIP and oops trace. This aids
debugging but costs about 70-100K of memory.

+Debug jiffies counter wraparound (DANGEROUS)
+CONFIG_DEBUG_JIFFIESWRAP
+ Say Y here to initialize the jiffies counter to a value 5 minutes
+ before wraparound. This may make your system UNSTABLE and its
+ only use is to hunt down the causes of this instability.
+ If you don't know what the jiffies counter is or if you want
+ a stable system, say N.
+
Include kgdb kernel debugger
CONFIG_KGDB
Include in-kernel hooks for kgdb, the Linux kernel source level
--- linux-2.4.19-pre2-j64/arch/arm/config.in Fri Nov 9 22:58:02 2001
+++ linux-2.4.19-pre2-j64-dbg/arch/arm/config.in Fri Mar 1 01:38:50 2002
@@ -601,6 +601,7 @@
bool 'Magic SysRq key' CONFIG_MAGIC_SYSRQ
bool 'Spinlock debugging' CONFIG_DEBUG_SPINLOCK
dep_bool 'Disable pgtable cache' CONFIG_NO_PGT_CACHE $CONFIG_CPU_26
+bool 'Debug jiffies counter wraparound (DANGEROUS)' CONFIG_DEBUG_JIFFIESWRAP
# These options are only for real kernel hackers who want to get their hands dirty.
dep_bool 'Kernel low-level debugging functions' CONFIG_DEBUG_LL $CONFIG_EXPERIMENTAL
dep_bool ' Kernel low-level debugging messages via footbridge serial port' CONFIG_DEBUG_DC21285_PORT $CONFIG_DEBUG_LL $CONFIG_FOOTBRIDGE
--- linux-2.4.19-pre2-j64/arch/cris/config.in Sun Feb 24 19:20:36 2002
+++ linux-2.4.19-pre2-j64-dbg/arch/cris/config.in Fri Mar 1 01:38:50 2002
@@ -253,4 +253,5 @@
if [ "$CONFIG_PROFILE" = "y" ]; then
int ' Profile shift count' CONFIG_PROFILE_SHIFT 2
fi
+bool 'Debug jiffies counter wraparound (DANGEROUS)' CONFIG_DEBUG_JIFFIESWRAP
endmenu
--- linux-2.4.19-pre2-j64/arch/i386/config.in Thu Feb 28 23:52:04 2002
+++ linux-2.4.19-pre2-j64-dbg/arch/i386/config.in Fri Mar 1 01:38:50 2002
@@ -425,6 +425,7 @@
bool ' Magic SysRq key' CONFIG_MAGIC_SYSRQ
bool ' Spinlock debugging' CONFIG_DEBUG_SPINLOCK
bool ' Verbose BUG() reporting (adds 70K)' CONFIG_DEBUG_BUGVERBOSE
+ bool ' Debug jiffies counter wraparound (DANGEROUS)' CONFIG_DEBUG_JIFFIESWRAP
fi

endmenu
--- linux-2.4.19-pre2-j64/arch/m68k/config.in Tue Jun 12 04:15:27 2001
+++ linux-2.4.19-pre2-j64-dbg/arch/m68k/config.in Fri Mar 1 01:38:50 2002
@@ -545,4 +545,5 @@

#bool 'Debug kmalloc/kfree' CONFIG_DEBUG_MALLOC
bool 'Magic SysRq key' CONFIG_MAGIC_SYSRQ
+bool 'Debug jiffies counter wraparound (DANGEROUS)' CONFIG_DEBUG_JIFFIESWRAP
endmenu
--- linux-2.4.19-pre2-j64/arch/mips/config.in Thu Feb 28 23:52:05 2002
+++ linux-2.4.19-pre2-j64-dbg/arch/mips/config.in Fri Mar 1 01:38:50 2002
@@ -643,4 +643,5 @@
if [ "$CONFIG_SMP" != "y" ]; then
bool 'Run uncached' CONFIG_MIPS_UNCACHED
fi
+bool 'Debug jiffies counter wraparound (DANGEROUS)' CONFIG_DEBUG_JIFFIESWRAP
endmenu
--- linux-2.4.19-pre2-j64/arch/parisc/config.in Wed Apr 18 02:19:25 2001
+++ linux-2.4.19-pre2-j64-dbg/arch/parisc/config.in Fri Mar 1 01:38:50 2002
@@ -206,5 +206,6 @@

#bool 'Debug kmalloc/kfree' CONFIG_DEBUG_MALLOC
bool 'Magic SysRq key' CONFIG_MAGIC_SYSRQ
+bool 'Debug jiffies counter wraparound (DANGEROUS)' CONFIG_DEBUG_JIFFIESWRAP
endmenu

--- linux-2.4.19-pre2-j64/arch/ppc/config.in Thu Feb 28 23:52:07 2002
+++ linux-2.4.19-pre2-j64-dbg/arch/ppc/config.in Fri Mar 1 01:38:50 2002
@@ -402,4 +402,5 @@
bool 'Magic SysRq key' CONFIG_MAGIC_SYSRQ
bool 'Include kgdb kernel debugger' CONFIG_KGDB
bool 'Include xmon kernel debugger' CONFIG_XMON
+bool 'Debug jiffies counter wraparound (DANGEROUS)' CONFIG_DEBUG_JIFFIESWRAP
endmenu
--- linux-2.4.19-pre2-j64/arch/sh/config.in Sun Feb 24 19:20:37 2002
+++ linux-2.4.19-pre2-j64-dbg/arch/sh/config.in Fri Mar 1 01:38:50 2002
@@ -385,4 +385,5 @@
if [ "$CONFIG_SH_STANDARD_BIOS" = "y" ]; then
bool 'Early printk support' CONFIG_SH_EARLY_PRINTK
fi
+bool 'Debug jiffies counter wraparound (DANGEROUS)' CONFIG_DEBUG_JIFFIESWRAP
endmenu
--- linux-2.4.19-pre2-j64/arch/sparc/config.in Tue Jun 12 04:15:27 2001
+++ linux-2.4.19-pre2-j64-dbg/arch/sparc/config.in Fri Mar 1 01:38:50 2002
@@ -265,4 +265,5 @@
comment 'Kernel hacking'

bool 'Magic SysRq key' CONFIG_MAGIC_SYSRQ
+bool 'Debug jiffies counter wraparound (DANGEROUS)' CONFIG_DEBUG_JIFFIESWRAP
endmenu
-
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