On Fri, Jul 06, 2018 at 02:07:40PM +0800, Guo Ren wrote: > > Please explain those mb()'s... I'm thinking you meant to use smp_mb(). > Yes, smp_mb(). Current smp_mb()&mb() is the same: sync.is. > > In next version patch, I'll seperate smp_mb() and mb() and use ld/st.barrier > instead of sync.is. Sync.is is expensive that it flush cpu's pipeline. I'll second my own call for documentation, because now there's three memory ordering instructions: "SYNC", "SYNC.IS" and "LD/ST.BARRIER" None of which have yet been explained.
