> Yes I suppose the branch can be executed "non speculatively" before the > lwsync is completed. Wheras the larx/stcwx will have to complete before > the branch outcome can be known. I suppose probably not worthwhile > avoiding the full IO sync by adding yet more crap to make this work. > > Thanks for putting my mind to rest though :) > > I'd still be interested to know how expensive the full sync is when you > have a lot of IOs in flight. > > Question, are you going to do the hint and isync->lwsync thing for > userspace as well? Too bad the kernel doesn't export synchronisation > primitives to userspace...
We'd love to.... the vdso inherits from all the dynamic patching features of the kernel and more... It's really a matter of getting glibc to grok it, and doing so efficiently (ie, not just having a function point in glibc, might be a good use of the IFUNC stuff). Cheers, Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
