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

@@ -780,11 +780,10 @@
         segkmem_fault,
         SEGKMEM_BADOP(faultcode_t),     /* faulta */
         segkmem_setprot,
         segkmem_checkprot,
         segkmem_kluster,
-        SEGKMEM_BADOP(size_t),          /* swapout */
         SEGKMEM_BADOP(int),             /* sync */
         SEGKMEM_BADOP(size_t),          /* incore */
         SEGKMEM_BADOP(int),             /* lockop */
         SEGKMEM_BADOP(int),             /* getprot */
         SEGKMEM_BADOP(u_offset_t),      /* getoffset */