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Subject[patch] enable uptime display > 497 days on 32 bit (2/2)
A config option to move the jiffies wrap forward to 5 minutes after boot.
Should be applied on top of the 64 bit jiffies patch.

Tim


--- linux-2.4.19-pre8-j64/include/linux/timex.h Sun May 5 19:11:11 2002
+++ linux-2.4.19-pre8-j64-dbg/include/linux/timex.h Sun May 5 20:34:14 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-pre8-j64/kernel/timer.c Sun May 5 19:28:22 2002
+++ linux-2.4.19-pre8-j64-dbg/kernel/timer.c Sun May 5 20:35:28 2002
@@ -65,9 +65,10 @@

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

-unsigned long volatile jiffies;
+unsigned long volatile jiffies = INITIAL_JIFFIES;
#ifdef NEEDS_JIFFIES64
-static unsigned int volatile jiffies_msb_flips;
+static unsigned int volatile
+ jiffies_msb_flips = INITIAL_JIFFIES>>(BITS_PER_LONG-1);
#endif

unsigned int * prof_buffer;
@@ -123,10 +124,21 @@
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)
{
@@ -661,7 +673,7 @@
}

/* 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-pre8-j64/fs/proc/array.c Sat May 4 20:50:04 2002
+++ linux-2.4.19-pre8-j64-dbg/fs/proc/array.c Sun May 5 20:34:14 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-pre8-j64/fs/proc/proc_misc.c Sun May 5 19:32:17 2002
+++ linux-2.4.19-pre8-j64-dbg/fs/proc/proc_misc.c Sun May 5 20:37:45 2002
@@ -189,7 +189,7 @@
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_sidle64() + get_uidle64();
idle_remainder = (unsigned long) do_div(idle, HZ);
@@ -341,7 +341,8 @@
int i, len;
extern unsigned long total_forks;
unsigned int sum = 0;
- u64 jif = get_jiffies64(), user = 0, nice = 0, system = 0;
+ u64 jif = get_jiffies64() - INITIAL_JIFFIES;
+ u64 user = 0, nice = 0, system = 0;
int major, disk;

for (i = 0 ; i < smp_num_cpus; i++) {
--- linux-2.4.19-pre8-j64/kernel/info.c Sat May 4 20:50:04 2002
+++ linux-2.4.19-pre8-j64-dbg/kernel/info.c Sun May 5 20:34:14 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-pre8-j64/Documentation/Configure.help Sat May 4 19:32:30 2002
+++ linux-2.4.19-pre8-j64-dbg/Documentation/Configure.help Sun May 5 20:34:14 2002
@@ -24599,6 +24599,14 @@
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-pre8-j64/arch/arm/config.in Sat May 4 19:32:05 2002
+++ linux-2.4.19-pre8-j64-dbg/arch/arm/config.in Sun May 5 20:40:28 2002
@@ -648,7 +648,7 @@
dep_bool ' Magic SysRq key' CONFIG_MAGIC_SYSRQ $CONFIG_DEBUG_KERNEL
dep_bool ' Spinlock debugging' CONFIG_DEBUG_SPINLOCK $CONFIG_DEBUG_KERNEL
dep_bool ' Wait queue debugging' CONFIG_DEBUG_WAITQ $CONFIG_DEBUG_KERNEL
-dep_bool ' Verbose BUG() reporting (adds 70K)' CONFIG_DEBUG_BUGVERBOSE $CONFIG_DEBUG_KERNEL
+bool 'Debug jiffies counter wraparound (DANGEROUS)' CONFIG_DEBUG_JIFFIESWRAPdep_bool ' Verbose BUG() reporting (adds 70K)' CONFIG_DEBUG_BUGVERBOSE $CONFIG_DEBUG_KERNEL
dep_bool ' Verbose kernel error messages' CONFIG_DEBUG_ERRORS $CONFIG_DEBUG_KERNEL
# 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 $CONFIG_DEBUG_KERNEL
--- linux-2.4.19-pre8-j64/arch/cris/config.in Sun Feb 24 19:20:36 2002
+++ linux-2.4.19-pre8-j64-dbg/arch/cris/config.in Sun May 5 20:34:14 2002
@@ -253,4 +253,5 @@
if [ "$CONFIG_PROFILE" = "y" ]; then
int ' Profile shift count' CONFIG_PROFILE_SHIFT 2
fi
+bool 'Debug jiffies counter wraparound (DANGEROUS)' CONFIG_DEBUG_JIFFIESWRAP
endmenu
diff -r -u --exclude-from dontdiff linux-2.4.19-pre8-j64/arch/i386/config.in linux-2.4.19-pre8-j64-dbg/arch/i386/config.in
--- linux-2.4.19-pre8-j64/arch/i386/config.in Sat May 4 19:32:31 2002
+++ linux-2.4.19-pre8-j64-dbg/arch/i386/config.in Sun May 5 20:41:49 2002
@@ -423,6 +423,7 @@
bool ' Magic SysRq key' CONFIG_MAGIC_SYSRQ
bool ' Spinlock debugging' CONFIG_DEBUG_SPINLOCK
bool ' Compile the kernel with frame pointers' CONFIG_FRAME_POINTER
+ bool ' Debug jiffies counter wraparound (DANGEROUS)' CONFIG_DEBUG_JIFFIESWRAP
fi

endmenu
--- linux-2.4.19-pre8-j64/arch/m68k/config.in Sat May 4 19:32:31 2002
+++ linux-2.4.19-pre8-j64-dbg/arch/m68k/config.in Sun May 5 20:42:45 2002
@@ -561,6 +561,7 @@
if [ "$CONFIG_DEBUG_KERNEL" != "n" ]; then
bool ' Magic SysRq key' CONFIG_MAGIC_SYSRQ
bool ' Debug memory allocations' CONFIG_DEBUG_SLAB
+ bool 'Debug jiffies counter wraparound (DANGEROUS)' CONFIG_DEBUG_JIFFIESWRAP
bool ' Verbose BUG() reporting' CONFIG_DEBUG_BUGVERBOSE
fi

--- linux-2.4.19-pre8-j64/arch/mips/config.in Sat Mar 30 19:12:27 2002
+++ linux-2.4.19-pre8-j64-dbg/arch/mips/config.in Sun May 5 20:34:14 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-pre8-j64/arch/parisc/config.in Wed Apr 18 02:19:25 2001
+++ linux-2.4.19-pre8-j64-dbg/arch/parisc/config.in Sun May 5 20:34:14 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-pre8-j64/arch/ppc/config.in Sat May 4 19:32:05 2002
+++ linux-2.4.19-pre8-j64-dbg/arch/ppc/config.in Sun May 5 20:34:14 2002
@@ -401,4 +401,5 @@
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-pre8-j64/arch/sh/config.in Sun Feb 24 19:20:37 2002
+++ linux-2.4.19-pre8-j64-dbg/arch/sh/config.in Sun May 5 20:34:14 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-pre8-j64/arch/sparc/config.in Sat May 4 19:32:31 2002
+++ linux-2.4.19-pre8-j64-dbg/arch/sparc/config.in Sun May 5 20:34:14 2002
@@ -270,4 +270,5 @@
comment 'Kernel hacking'

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

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