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6583 remove whole-process swapping

@@ -221,15 +221,10 @@
          * Mark the time when thread is placed on wait queue. The microstate
          * accounting code uses this timestamp to determine wait times.
          */
         t->t_waitrq = gethrtime_unscaled();
 
-        /*
-         * Mark thread as not swappable.  If necessary, it will get
-         * swapped out when it returns to the userland.
-         */
-        t->t_schedflag |= TS_DONT_SWAP;
         DTRACE_SCHED1(cpucaps__sleep, kthread_t *, t);
         waitq_link(wq, t);
 
         THREAD_WAIT(t, &wq->wq_lock);
         return (1);