On 6/10/19 4:54 PM, Andy Lutomirski wrote: > Another benefit of kernel management: we could plausibly auto-clear > the bits corresponding to munmapped regions. Is this worth it?
I did it for MPX. I think I even went to the trouble of zapping the whole pages that got unused. But, MPX tables took 80% of the address space, worst-case. This takes 0.003% :) The only case it would really matter would be a task was long-running, used legacy executables/JITs, and was mapping/unmapping text all over the address space. That seems rather unlikely.
