Hi...
> One of our customer is facing an issue with jiffies wrap up.
> on a 32 bit machine, the variable jiffies count upto 472 days.
> the customer's server was up for 472 days ('uptime') and to reproduce
> the same, i tried to tweak with the variable HZ in
you're chance is to go with 64 bit IMHO
> static int __init jiffies_init(void)
> {
> unsigned long j,z;
> j = z = 0;
> j = jiffies;
> z = HZ;
> printk(KERN_ALERT "jiffies value is %lu\n",j);
> printk(KERN_ALERT "jiffies value in seconds %lu\n",(jiffies/HZ));
> printk(KERN_ALERT "HZ value is %lu\n",z);
> return 0;
> }
>
> static void __exit jiffies_exit(void)
> {
> printk(KERN_ALERT "Goodbye, world!\n");
> }
>
> module_init(jiffies_init);
> module_exit(jiffies_exit);
>
> MODULE_LICENSE("GPL");
>
> [root@localhost drivers]# insmod get_jiffies.ko
> [root@localhost drivers]# dmesg
> jiffies value is 372939
> jiffies value in seconds 1491
> HZ value is 250 <====
>
> why this HZ variable is shown as 250 ?
because you're kernel is still effectively use 250 as HZ....
regards,
Mulyadi.
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