remove whole-process swapping
Long before Unix supported paging, it used process swapping to reclaim
memory.  The code is there and in theory it runs when we get *extremely* low
on memory.  In practice, it never runs since the definition of low-on-memory
is antiquated. (XXX: define what antiquated means)
You can check the number of swapout/swapin events with kstats:
$ kstat -p ::vm:swapin ::vm:swapout

*** 161,177 ****
  
          fsip->fsi_sobj_ops = (uintptr_t)thr.t_sobj_ops;
          fsip->fsi_tstate = thr.t_state;
          fsip->fsi_panic = !!(thr.t_flag & T_PANIC);
  
-         if ((thr.t_schedflag & TS_LOAD) == 0) {
-                 if (print_warnings)
-                         mdb_warn("thread %p isn't in memory\n", addr);
-                 fsip->fsi_failed = FSI_FAIL_NOTINMEMORY;
-                 return (DCMD_ERR);
-         }
- 
          if (thr.t_stk < thr.t_stkbase) {
                  if (print_warnings)
                          mdb_warn(
                              "stack base or stack top corrupt for thread %p\n",
                              addr);
--- 161,170 ----