- Add a new process flag P_NOLOAD that marks a process that should be

ignored during load average calcuations.
- Set this flag for the idle processes and the softinterrupt process.

sys/amd64/isa/ithread.c

@@ -299,6 +299,7 @@ start_softintr(void *dummy)
 	p->p_rtprio.type = RTP_PRIO_ITHREAD;
 	p->p_rtprio.prio = PI_SOFT;	/* soft interrupt */
 	p->p_stat = SWAIT;		/* we're idle */
+	p->p_flag |= P_NOLOAD;
 
 	/* Put in linkages. */
 	softintr->it_proc = p;

sys/i386/isa/ithread.c

@@ -299,6 +299,7 @@ start_softintr(void *dummy)
 	p->p_rtprio.type = RTP_PRIO_ITHREAD;
 	p->p_rtprio.prio = PI_SOFT;	/* soft interrupt */
 	p->p_stat = SWAIT;		/* we're idle */
+	p->p_flag |= P_NOLOAD;
 
 	/* Put in linkages. */
 	softintr->it_proc = p;

sys/kern/kern_idle.c

@@ -65,6 +65,7 @@ idle_setup(void *dummy)
 		if (error)
 			panic("idle_setup: kthread_create error %d\n", error);
 
+		gd->gd_idleproc->p_flag |= P_NOLOAD;
 		gd->gd_idleproc->p_stat = SRUN;
 	}
 }

sys/sys/proc.h

@@ -266,7 +266,7 @@ struct	proc {
 #define	SSLEEP	3		/* Sleeping on an address. */
 #define	SSTOP	4		/* Process debugging or suspension. */
 #define	SZOMB	5		/* Awaiting collection by parent. */
-#define	SWAIT	6		/* Waiting for interrupt or CPU. */
+#define	SWAIT	6		/* Waiting for interrupt. */
 #define	SMTX	7		/* Blocked on a mutex. */
 
 /* These flags are kept in p_flags. */
@@ -284,6 +284,7 @@ struct	proc {
 #define	P_WAITED	0x01000	/* Debugging process has waited for child. */
 #define	P_WEXIT		0x02000	/* Working on exiting. */
 #define	P_EXEC		0x04000	/* Process called exec. */
+#define P_NOLOAD	0x08000	/* Ignore during load avg calculations. */
 
 /* Should probably be changed into a hold count. */
 /* was	P_NOSWAP	0x08000	was: Do not swap upages; p->p_hold */

sys/vm/vm_meter.c

@@ -85,6 +85,9 @@ loadav(struct loadavg *avg)
 				continue;
 			/* FALLTHROUGH */
 		case SRUN:
+			if ((p->p_flag & P_NOLOAD) != 0)
+				continue;
+			/* FALLTHROUGH */
 		case SIDL:
 			nrun++;
 		}