- Adjust sched hooks for fork and exec to take processes as arguments instead

of ksegs since they primarily operation on processes.
 - KSEs take ticks so pass the kse through sched_clock().
 - Add a sched_class() routine that adjusts a ksegrp pri class.
 - Define a sched_fork_{kse,thread,ksegrp} and sched_exit_{kse,thread,ksegrp}
   that will be used to tell the scheduler about new instances of these
   structures within the same process.  These will be used by THR and KSE.
 - Change sched_4bsd to reflect this API update.

sys/kern/kern_clock.c

@@ -405,7 +405,7 @@ statclock(frame)
 		}
 	}
 
-	sched_clock(td);
+	sched_clock(ke);
 
 	/* Update resource usage integrals and maximums. */
 	if ((pstats = p->p_stats) != NULL &&

sys/kern/kern_exit.c

@@ -493,6 +493,13 @@ exit1(struct thread *td, int rv)
 	PCPU_SET(switchticks, ticks);
 
 	cpu_sched_exit(td); /* XXXKSE check if this should be in thread_exit */
+	/*
+	 * Allow the scheduler to adjust the priority of the
+	 * parent when a kseg is exiting.
+	 */
+	if (p->p_pid != 1) 
+		sched_exit(p->p_pptr, p);
+
 	/*
 	 * Make sure the scheduler takes this thread out of its tables etc.
 	 * This will also release this thread's reference to the ucred.
@@ -575,17 +582,6 @@ wait1(struct thread *td, struct wait_args *uap, int compat)
 
 		nfound++;
 		if (p->p_state == PRS_ZOMBIE) {
-			/*
-			 * Allow the scheduler to adjust the priority of the
-			 * parent when a kseg is exiting.
-			 */
-			if (curthread->td_proc->p_pid != 1) {
-				mtx_lock_spin(&sched_lock);
-				sched_exit(curthread->td_ksegrp,
-				    FIRST_KSEGRP_IN_PROC(p));
-				mtx_unlock_spin(&sched_lock);
-			}
-
 			td->td_retval[0] = p->p_pid;
 #ifdef COMPAT_43
 			if (compat)

sys/kern/kern_fork.c

@@ -496,7 +496,7 @@ fork1(td, flags, pages, procp)
 	 * Allow the scheduler to adjust the priority of the child and
 	 * parent while we hold the sched_lock.
 	 */
-	sched_fork(td->td_ksegrp, kg2);
+	sched_fork(p1, p2);
 
 	mtx_unlock_spin(&sched_lock);
 	p2->p_ucred = crhold(td->td_ucred);

sys/kern/kern_resource.c

@@ -407,7 +407,7 @@ rtp_to_pri(struct rtprio *rtp, struct ksegrp *kg)
 	default:
 		return (EINVAL);
 	}
-	kg->kg_pri_class = rtp->type;
+	sched_class(kg, rtp->type);
 	if (curthread->td_ksegrp == kg) {
 		curthread->td_base_pri = kg->kg_user_pri;
 		curthread->td_priority = kg->kg_user_pri; /* XXX dubious */

sys/sys/sched.h

@@ -35,32 +35,43 @@
 int	sched_rr_interval(void);
 int	sched_runnable(void);
 
+/* 
+ * Proc related scheduling hooks.
+ */
+void	sched_exit(struct proc *p, struct proc *child);
+void	sched_fork(struct proc *p, struct proc *child);
+
 /*
  * KSE Groups contain scheduling priority information.  They record the
  * behavior of groups of KSEs and threads.
  */
-void	sched_exit(struct ksegrp *kg, struct ksegrp *child);
-void	sched_fork(struct ksegrp *kg, struct ksegrp *child);
+void	sched_class(struct ksegrp *kg, int class);
+void	sched_exit_ksegrp(struct ksegrp *kg, struct ksegrp *child);
+void	sched_fork_ksegrp(struct ksegrp *kg, struct ksegrp *child);
 void	sched_nice(struct ksegrp *kg, int nice);
-void	sched_prio(struct thread *td, u_char prio);
-void	sched_userret(struct thread *td);
 
 /*
  * Threads are switched in and out, block on resources, and have temporary
  * priorities inherited from their ksegs.
  */
-void	sched_clock(struct thread *td);
+void	sched_exit_thread(struct thread *td, struct thread *child);
+void	sched_fork_thread(struct thread *td, struct thread *child);
+void	sched_prio(struct thread *td, u_char prio);
 void	sched_sleep(struct thread *td, u_char prio);
 void	sched_switchin(struct thread *td);
 void	sched_switchout(struct thread *td);
+void	sched_userret(struct thread *td);
 void	sched_wakeup(struct thread *td);
 
 /*
  * KSEs are moved on and off of run queues.
  */
 void	sched_add(struct kse *ke);
-void	sched_rem(struct kse *ke);
 struct kse *sched_choose(void);
+void	sched_clock(struct kse *ke);
+void	sched_exit_kse(struct kse *ke, struct kse *child);
+void	sched_fork_kse(struct kse *ke, struct kse *child);
+void	sched_rem(struct kse *ke);
 
 /*
  * and they use up cpu time.