Comment # 8 on bug 1229450 from Michal Suchanek

       -j, --jobs=N
              Run  N  jobs in parallel. Defaults to number of online processors
+ 10% (like the 'ninja' build system)
              if no argument is specified.

So with 160 CPUs you would get 176 threads.

There is scripts/pahole-flags.sh in the kernel tree which determines the flags
to pass to pahole, I think it's reasonable to patch that.