Mismatch in Pagefault and vmstat values in Ubuntu
 

I want to capture the Pagefault values in Ubuntu.

Below is my code logic to capture Pagefaults :

"(vm_event_states.event[PGFAULT])"

But when I run the following commands there is a huge difference in the values :

db@ubuntu:~/pgfault$ grep pgfault /proc/vmstat
pgfault 4648883
db@ubuntu:~/pgfault$ cat /proc/pgfault
2358120
db@ubuntu:~/pgfault$ grep pgfault /proc/vmstat
pgfault 4649312
db@ubuntu:~/pgfault$ grep pgfault /proc/vmstat
pgfault 4649663
db@ubuntu:~/pgfault$ cat /proc/pgfault
2291317
student@ubuntu:~/pgfault$ grep pgfault /proc/vmstat
pgfault 4650279

Can someone please help me to understand why there is such a huge difference in the values of pagefaults? Or is there something I missed in the logic of calculation.

I also tried for the "major fault" and the "minor fault" but it didn't work.

Please suggest.

Certainly looks like it.
Have you read vmstat.h ?. Have you ascertained the (rough) ratio of your numbers to those reported in /proc/vmstat ?.