check_linux_procstat.pl with oracle linux kernel 2.6.39 doesn't work anymore

[davmik]

On oraclelinux with kernel 2.6.18 it works as inteded.
On oraclelinux with kernel 2.6.39 there is always a critical alarming shown but in real the cpu usage is always below 10%. It seems that there isn't checked against cpu used anymore but against cpu free.

CRITICAL - 2 CPU cores - CPU(all) 95.0% used > 90%, CPU0 97.0% used > 90%, CPU1 93.0% used > 90%
-> but CPU usage is very low

So something changed in the kernel version between 2.6.18 and 2.6.39 in relation to /proc/stat

I had a small look at the changelog of those kernels and found a possible reason for this issue in kenel uupdate 2.6.37 at "Memory management":
/proc/stat: Make reading /proc/stat scalable (commit), fix scalability of irq sum of all cpu (commit)

Please have a look at:
http://kernelnewbies.org/Linux_2_6_37

Feel free to contact me for testing!