On Fri, 6 May 2016, Darren Hart wrote: > It would be good to have a way to detect that the process private hash table > was > > successfully created. Perhaps a /proc/pid/ feature? This would allow us to > > write > > a functional futex test for tools/testing/selftests/futex > > I suppose we could just use FUTEX_PREALLOC_HASH for this purpose, passing in > the > default hash size. This will either return the default, the previously set > value, or 0, indicating the global hash is being used. That should be > sufficient > for programatically determining the state of the system.
Right. > The /proc/pid/futex_hash_size option may still be convenient for other > purposes. > Perhaps with a -1 indicating it hasn't been set yet. Dunno, whether that's valuable, but it can be done on top. Thanks, tglx