Enquiries on Load Barrier Overhead

[Dawei Li]

 Hi ZGC Team,

When I read the Jfokus 2018 slides about ZGC I have a few questions about
load barrier overhead  at slide No 44.

Question 1: How do you measure the execution overhead on SPECjbb 2015? How
do you configure base line testing and correspondingly, overhead testing?

Question 2: Is the *slow* *path* a source of overhead? Is it the *main*
source?

Looking forward to your reply! Thank you!

Warm Regards,
Dawei Li