Hi all

 

Please find the patch for Save extra cpu cycles in getting slow/fast domain(Commit ID : 2926ff354657c02ad4e1c453138f8670d031d7c4)

 

 

Description:

 

In present code, it is compulsory to check if the cpu is in slowest/fastest domain before calling the functions;

 

hmp_slower_domain() and hmp_faster_domain() to get the relative slower/faster domains.

 

If the caller calls without checking, it will give invlaid address which can result in undefined behavior.

 

Also in the functions

 

hmp_select_slower_cpu(), hmp_select_faster_cpu() and  hmp_best_little_cpu(),

 

extra cpu cycles and instructions can be saved by changing the flow to get the relative slower/faster domain. As with this change the function

hmp_slower_domain() and hmp_faster_domain() will itself take care of the condition if the current cpu is in slowest or fastest domain.

So extra checks before getting the relative faster/slower domains can be avoided thus reducing function calls and prevent cpu cycles thus improving the performance.

 

 

Regards

Gaurav Jindal

+91-8800803297

CPCEX ID: gaurav.j