//How to get high precision nano second delay in linux


#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/delay.h>

static int __init initialize(void)
{
    ktime_t start, end;
    s64 actual_time;
    int i;
    for(i=0;i<10;i++)
    {
        start = ktime_get();
            ndelay(100);            
        end = ktime_get();
        actual_time = ktime_to_ns(ktime_sub(end, start));
        printk("%lld\n",(long long)actual_time);    
    }
    return 0;
}

static void __exit final(void)
{
     printk(KERN_INFO "Unload module\n");
}

module_init(initialize);
module_exit(final);

MODULE_AUTHOR("Bhaskar");
MODULE_DESCRIPTION("delay of 100ns");
MODULE_LICENSE("GPL");



////////////////////////////////////////////////
the dmesg output is like this:

[16603.805783] 514
[16603.805787] 350
[16603.805789] 373
[16603.805791] 323
[16603.805793] 362
[16603.805794] 320
[16603.805796] 331
[16603.805797] 312
[16603.805799] 304
[16603.805801] 350

I have gone through one of the posts in stackoverflow: Why udelay and ndelay is not accurate in linux kernel?

But I want a fine tuned nanosecond delay (probably in the range of 100-250ns) in kernel space. Can anyone please suggest me any alternative for doing this?