[unix-history] / usr / src / sys / kern / kern_clock.c

/*	%H%	3.20	kern_clock.c	*/

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/dk.h"
#include "../h/callo.h"
#include "../h/seg.h"
#include "../h/dir.h"
#include "../h/user.h"
#include "../h/proc.h"
#include "../h/reg.h"
#include "../h/psl.h"
#include "../h/vm.h"
#include "../h/buf.h"
#include "../h/text.h"
#include "../h/vlimit.h"
#include "../h/mtpr.h"
#include "../h/clock.h"

#define	SCHMAG	9/10

/*
 * Constant for decay filter for cpu usage.
 */
double	ccpu = 0.93550698503161773774;		/* exp(-1/15) */

/*
 * Clock is called straight from
 * the real time clock interrupt.
 *
 * Functions:
 *	implement callouts
 *	maintain user/system times
 *	maintain date
 *	profile
 *	lightning bolt wakeup (every second)
 *	alarm clock signals
 *	jab the scheduler
 */
#ifdef KPROF
unsigned short kcount[20000];
#endif

/*
 * We handle regular calls to the dh and dz silo input processors
 * without using timeouts to save a little time.
 */
int	rintvl = 0;		/* every 1/60'th of sec check receivers */
int	rcnt;

clock(pc, ps)
caddr_t pc;
{
	register struct callo *p1, *p2;
	register struct proc *pp;
	register int s;
	int a, cpstate;

	/*
	 * reprime clock
	 */
	clkreld();

	/*
	 * callouts
	 * else update first non-zero time
	 */

	if(callout[0].c_func == NULL)
		goto out;
	p2 = &callout[0];
	while(p2->c_time<=0 && p2->c_func!=NULL)
		p2++;
	p2->c_time--;

	/*
	 * if ps is high, just return
	 */
	if (BASEPRI(ps))
		goto out;

	/*
	 * callout
	 */

	if(callout[0].c_time <= 0) {
		p1 = &callout[0];
		while(p1->c_func != 0 && p1->c_time <= 0) {
			(*p1->c_func)(p1->c_arg);
			p1++;
		}
		p2 = &callout[0];
		while(p2->c_func = p1->c_func) {
			p2->c_time = p1->c_time;
			p2->c_arg = p1->c_arg;
			p1++;
			p2++;
		}
	}

	/*
	 * lightning bolt time-out
	 * and time of day
	 */
out:

	/*
	 * In order to not take input character interrupts to use
	 * the input silo on DZ's we have to guarantee to echo
	 * characters regularly.  This means that we have to
	 * call the timer routines predictably.  Since blocking
	 * in these routines is at spl5(), we have to make spl5()
	 * really spl6() blocking off the clock to put this code
	 * here.  Note also that it is critical that we run spl5()
	 * (i.e. really spl6()) in the receiver interrupt routines
	 * so we can't enter them recursively and transpose characters.
	 */
	if (rcnt >= rintvl) {
		dhtimer();
		dztimer();
		rcnt = 0;
	} else
		rcnt++;
	if (!noproc) {
		s = u.u_procp->p_rssize;
		u.u_vm.vm_idsrss += s;
		if (u.u_procp->p_textp) {
			register int xrss = u.u_procp->p_textp->x_rssize;

			s += xrss;
			u.u_vm.vm_ixrss += xrss;
		}
		if (s > u.u_vm.vm_maxrss)
			u.u_vm.vm_maxrss = s;
		if ((u.u_vm.vm_utime+u.u_vm.vm_stime+1)/HZ > u.u_limit[LIM_CPU]) {
			psignal(u.u_procp, SIGXCPU);
			if (u.u_limit[LIM_CPU] < INFINITY - 5)
				u.u_limit[LIM_CPU] += 5;
		}
	}
	if (USERMODE(ps)) {
		u.u_vm.vm_utime++;
		if(u.u_procp->p_nice > NZERO)
			cpstate = CP_NICE;
		else
			cpstate = CP_USER;
	} else {
		cpstate = CP_SYS;
		if (noproc)
			cpstate = CP_IDLE;
		else
			u.u_vm.vm_stime++;
	}
	dk_time[cpstate][dk_busy&(DK_NSTATES-1)]++;
	if (!noproc) {
		pp = u.u_procp;
		pp->p_cpticks++;
		if(++pp->p_cpu == 0)
			pp->p_cpu--;
		if(pp->p_cpu % 16 == 0) {
			(void) setpri(pp);
			if (pp->p_pri >= PUSER)
				pp->p_pri = pp->p_usrpri;
		}
	}
	++lbolt;
	if (lbolt % (HZ/4) == 0) {
		vmpago();
		runrun++;
	}
	if (lbolt >= HZ) {
		extern int hangcnt;

		if (BASEPRI(ps))
			return;
		lbolt -= HZ;
		++time;
		(void) spl1();
		/*
		 * machdep.c:unhang uses hangcnt to make sure uba
		 * doesn't forget to interrupt (this has been observed).
		 * This prevents an accumulation of < 5 second uba failures
		 * from summing to a uba reset.
		 */
		if (hangcnt)
			hangcnt--;
		runrun++;
		wakeup((caddr_t)&lbolt);
		for(pp = &proc[0]; pp < &proc[NPROC]; pp++)
		if (pp->p_stat && pp->p_stat!=SZOMB) {
			if(pp->p_time != 127)
				pp->p_time++;
			if(pp->p_clktim)
				if(--pp->p_clktim == 0)
					if (pp->p_flag & STIMO) {
						s = spl6();
						switch (pp->p_stat) {

						case SSLEEP:
							setrun(pp);
							break;

						case SSTOP:
							unsleep(pp);
							break;
						}
						pp->p_flag &= ~STIMO;
						splx(s);
					} else
						psignal(pp, SIGALRM);
			if(pp->p_stat==SSLEEP||pp->p_stat==SSTOP)
				if (pp->p_slptime != 127)
					pp->p_slptime++;
			if (pp->p_flag&SLOAD)
				pp->p_pctcpu = ccpu * pp->p_pctcpu +
				    (1.0 - ccpu) * (pp->p_cpticks/(float)HZ);
			pp->p_cpticks = 0;
			a = (pp->p_cpu & 0377)*SCHMAG + pp->p_nice - NZERO;
			if(a < 0)
				a = 0;
			if(a > 255)
				a = 255;
			pp->p_cpu = a;
			(void) setpri(pp);
			s = spl6();
			if(pp->p_pri >= PUSER) {
				if ((pp != u.u_procp || noproc) &&
				    pp->p_stat == SRUN &&
				    (pp->p_flag & SLOAD) &&
				    pp->p_pri != pp->p_usrpri) {
					remrq(pp);
					pp->p_pri = pp->p_usrpri;
					setrq(pp);
				} else
					pp->p_pri = pp->p_usrpri;
			}
			splx(s);
		}
		vmmeter();
		if(runin!=0) {
			runin = 0;
			wakeup((caddr_t)&runin);
		}
		/*
		 * If there are pages that have been cleaned, 
		 * jolt the pageout daemon to process them.
		 * We do this here so that these pages will be
		 * freed if there is an abundance of memory and the
		 * daemon would not be awakened otherwise.
		 */
		if (bclnlist != NULL)
			wakeup((caddr_t)&proc[2]);
		if (USERMODE(ps)) {
			pp = u.u_procp;
#ifdef ERNIE
			if (pp->p_uid)
				if (pp->p_nice == NZERO && u.u_vm.vm_utime > 600 * HZ)
					pp->p_nice = NZERO+4;
			(void) setpri(pp);
			pp->p_pri = pp->p_usrpri;
#endif
		}
	}
	if (!BASEPRI(ps))
		unhang();
	if (USERMODE(ps)) {
		/*
		 * We do this last since it
		 * may block on a page fault in user space.
		 */
		if (u.u_prof.pr_scale)
			addupc(pc, &u.u_prof, 1);
	}
#ifdef KPROF
	else if (!noproc) {
		register int indx = ((int)pc & 0x7fffffff) / 4;

		if (indx >= 0 && indx < 20000)
			if (++kcount[indx] == 0)
				--kcount[indx];
	}
#endif
}

/*
 * timeout is called to arrange that
 * fun(arg) is called in tim/HZ seconds.
 * An entry is sorted into the callout
 * structure. The time in each structure
 * entry is the number of HZ's more
 * than the previous entry.
 * In this way, decrementing the
 * first entry has the effect of
 * updating all entries.
 *
 * The panic is there because there is nothing
 * intelligent to be done if an entry won't fit.
 */
timeout(fun, arg, tim)
int (*fun)();
caddr_t arg;
{
	register struct callo *p1, *p2;
	register int t;
	int s;

	t = tim;
	p1 = &callout[0];
	s = spl7();
	while(p1->c_func != 0 && p1->c_time <= t) {
		t -= p1->c_time;
		p1++;
	}
	if (p1 >= &callout[NCALL-1])
		panic("Timeout table overflow");
	p1->c_time -= t;
	p2 = p1;
	while(p2->c_func != 0)
		p2++;
	while(p2 >= p1) {
		(p2+1)->c_time = p2->c_time;
		(p2+1)->c_func = p2->c_func;
		(p2+1)->c_arg = p2->c_arg;
		p2--;
	}
	p1->c_time = t;
	p1->c_func = fun;
	p1->c_arg = arg;
	splx(s);
}
Commit	Line	Data
dd808ba3	1	/* %H% 3.20 kern_clock.c */
83be5fac BJ	2
	3	#include "../h/param.h"
	4	#include "../h/systm.h"
d9b8447e	5	#include "../h/dk.h"
83be5fac BJ	6	#include "../h/callo.h"
	7	#include "../h/seg.h"
	8	#include "../h/dir.h"
	9	#include "../h/user.h"
	10	#include "../h/proc.h"
	11	#include "../h/reg.h"
	12	#include "../h/psl.h"
	13	#include "../h/vm.h"
	14	#include "../h/buf.h"
	15	#include "../h/text.h"
95ce0d37 BJ	16	#include "../h/vlimit.h"
	17	#include "../h/mtpr.h"
	18	#include "../h/clock.h"
83be5fac BJ	19
	20	#define SCHMAG 9/10
	21
dd808ba3 BJ	22	/*
	23	* Constant for decay filter for cpu usage.
	24	*/
	25	double ccpu = 0.93550698503161773774; /* exp(-1/15) */
83be5fac BJ	26
83be5fac BJ	27	/*
dd808ba3	28	* Clock is called straight from
83be5fac BJ	29	* the real time clock interrupt.
	30	*
	31	* Functions:
	32	* implement callouts
	33	* maintain user/system times
	34	* maintain date
	35	* profile
	36	* lightning bolt wakeup (every second)
	37	* alarm clock signals
	38	* jab the scheduler
	39	*/
	40	#ifdef KPROF
525dfa77	41	unsigned short kcount[20000];
83be5fac BJ	42	#endif
83be5fac BJ	43
1c108279 BJ	44	/*
	45	* We handle regular calls to the dh and dz silo input processors
	46	* without using timeouts to save a little time.
	47	*/
d4be7420	48	int rintvl = 0; /* every 1/60'th of sec check receivers */
1c108279 BJ	49	int rcnt;
1c108279 BJ	50
83be5fac BJ	51	clock(pc, ps)
	52	caddr_t pc;
	53	{
	54	register struct callo p1, p2;
	55	register struct proc *pp;
	56	register int s;
41888f16	57	int a, cpstate;
83be5fac BJ	58
	59	/*
	60	* reprime clock
	61	*/
	62	clkreld();
	63
	64	/*
	65	* callouts
	66	* else update first non-zero time
	67	*/
	68
	69	if(callout[0].c_func == NULL)
	70	goto out;
	71	p2 = &callout[0];
	72	while(p2->c_time<=0 && p2->c_func!=NULL)
	73	p2++;
	74	p2->c_time--;
	75
	76	/*
	77	* if ps is high, just return
	78	*/
	79	if (BASEPRI(ps))
	80	goto out;
	81
	82	/*
	83	* callout
	84	*/
	85
	86	if(callout[0].c_time <= 0) {
	87	p1 = &callout[0];
	88	while(p1->c_func != 0 && p1->c_time <= 0) {
	89	(*p1->c_func)(p1->c_arg);
	90	p1++;
	91	}
	92	p2 = &callout[0];
	93	while(p2->c_func = p1->c_func) {
	94	p2->c_time = p1->c_time;
	95	p2->c_arg = p1->c_arg;
	96	p1++;
	97	p2++;
	98	}
	99	}
	100
	101	/*
	102	* lightning bolt time-out
	103	* and time of day
	104	*/
	105	out:
5da67d35 BJ	106
	107	/*
	108	* In order to not take input character interrupts to use
	109	* the input silo on DZ's we have to guarantee to echo
	110	* characters regularly. This means that we have to
	111	* call the timer routines predictably. Since blocking
	112	* in these routines is at spl5(), we have to make spl5()
	113	* really spl6() blocking off the clock to put this code
	114	* here. Note also that it is critical that we run spl5()
	115	* (i.e. really spl6()) in the receiver interrupt routines
	116	* so we can't enter them recursively and transpose characters.
	117	*/
	118	if (rcnt >= rintvl) {
	119	dhtimer();
	120	dztimer();
	121	rcnt = 0;
	122	} else
	123	rcnt++;
83be5fac BJ	124	if (!noproc) {
	125	s = u.u_procp->p_rssize;
	126	u.u_vm.vm_idsrss += s;
	127	if (u.u_procp->p_textp) {
	128	register int xrss = u.u_procp->p_textp->x_rssize;
	129
	130	s += xrss;
	131	u.u_vm.vm_ixrss += xrss;
	132	}
	133	if (s > u.u_vm.vm_maxrss)
	134	u.u_vm.vm_maxrss = s;
39f2f769 BJ	135	if ((u.u_vm.vm_utime+u.u_vm.vm_stime+1)/HZ > u.u_limit[LIM_CPU]) {
	136	psignal(u.u_procp, SIGXCPU);
	137	if (u.u_limit[LIM_CPU] < INFINITY - 5)
	138	u.u_limit[LIM_CPU] += 5;
	139	}
83be5fac	140	}
83be5fac BJ	141	if (USERMODE(ps)) {
	142	u.u_vm.vm_utime++;
	143	if(u.u_procp->p_nice > NZERO)
41888f16 BJ	144	cpstate = CP_NICE;
	145	else
	146	cpstate = CP_USER;
83be5fac	147	} else {
41888f16	148	cpstate = CP_SYS;
83be5fac	149	if (noproc)
41888f16	150	cpstate = CP_IDLE;
83be5fac BJ	151	else
	152	u.u_vm.vm_stime++;
	153	}
41888f16	154	dk_time[cpstate][dk_busy&(DK_NSTATES-1)]++;
83be5fac BJ	155	if (!noproc) {
83be5fac BJ	156	pp = u.u_procp;
dd808ba3	157	pp->p_cpticks++;
83be5fac BJ	158	if(++pp->p_cpu == 0)
	159	pp->p_cpu--;
	160	if(pp->p_cpu % 16 == 0) {
81263dba	161	(void) setpri(pp);
83be5fac BJ	162	if (pp->p_pri >= PUSER)
	163	pp->p_pri = pp->p_usrpri;
	164	}
	165	}
	166	++lbolt;
	167	if (lbolt % (HZ/4) == 0) {
	168	vmpago();
	169	runrun++;
	170	}
	171	if (lbolt >= HZ) {
95ce0d37 BJ	172	extern int hangcnt;
95ce0d37 BJ	173
83be5fac BJ	174	if (BASEPRI(ps))
	175	return;
	176	lbolt -= HZ;
	177	++time;
81263dba	178	(void) spl1();
95ce0d37 BJ	179	/*
	180	* machdep.c:unhang uses hangcnt to make sure uba
	181	* doesn't forget to interrupt (this has been observed).
	182	* This prevents an accumulation of < 5 second uba failures
	183	* from summing to a uba reset.
	184	*/
	185	if (hangcnt)
	186	hangcnt--;
83be5fac BJ	187	runrun++;
	188	wakeup((caddr_t)&lbolt);
	189	for(pp = &proc[0]; pp < &proc[NPROC]; pp++)
8418f526	190	if (pp->p_stat && pp->p_stat!=SZOMB) {
83be5fac BJ	191	if(pp->p_time != 127)
	192	pp->p_time++;
	193	if(pp->p_clktim)
	194	if(--pp->p_clktim == 0)
8add37d7 BJ	195	if (pp->p_flag & STIMO) {
8add37d7 BJ	196	s = spl6();
daac5944 BJ	197	switch (pp->p_stat) {
	198
	199	case SSLEEP:
8add37d7	200	setrun(pp);
daac5944 BJ	201	break;
	202
	203	case SSTOP:
	204	unsleep(pp);
	205	break;
	206	}
8add37d7 BJ	207	pp->p_flag &= ~STIMO;
	208	splx(s);
	209	} else
cccb9ee6	210	psignal(pp, SIGALRM);
83be5fac BJ	211	if(pp->p_stat==SSLEEP\|\|pp->p_stat==SSTOP)
	212	if (pp->p_slptime != 127)
	213	pp->p_slptime++;
dd808ba3 BJ	214	if (pp->p_flag&SLOAD)
	215	pp->p_pctcpu = ccpu * pp->p_pctcpu +
	216	(1.0 - ccpu) * (pp->p_cpticks/(float)HZ);
	217	pp->p_cpticks = 0;
83be5fac BJ	218	a = (pp->p_cpu & 0377)*SCHMAG + pp->p_nice - NZERO;
	219	if(a < 0)
	220	a = 0;
	221	if(a > 255)
	222	a = 255;
	223	pp->p_cpu = a;
81263dba	224	(void) setpri(pp);
83be5fac BJ	225	s = spl6();
	226	if(pp->p_pri >= PUSER) {
	227	if ((pp != u.u_procp \|\| noproc) &&
	228	pp->p_stat == SRUN &&
	229	(pp->p_flag & SLOAD) &&
	230	pp->p_pri != pp->p_usrpri) {
	231	remrq(pp);
	232	pp->p_pri = pp->p_usrpri;
	233	setrq(pp);
	234	} else
	235	pp->p_pri = pp->p_usrpri;
	236	}
	237	splx(s);
	238	}
	239	vmmeter();
	240	if(runin!=0) {
	241	runin = 0;
	242	wakeup((caddr_t)&runin);
	243	}
	244	/*
	245	* If there are pages that have been cleaned,
	246	* jolt the pageout daemon to process them.
	247	* We do this here so that these pages will be
	248	* freed if there is an abundance of memory and the
	249	* daemon would not be awakened otherwise.
	250	*/
	251	if (bclnlist != NULL)
	252	wakeup((caddr_t)&proc[2]);
83be5fac BJ	253	if (USERMODE(ps)) {
83be5fac BJ	254	pp = u.u_procp;
054016e1	255	#ifdef ERNIE
83be5fac BJ	256	if (pp->p_uid)
	257	if (pp->p_nice == NZERO && u.u_vm.vm_utime > 600 * HZ)
	258	pp->p_nice = NZERO+4;
81263dba	259	(void) setpri(pp);
83be5fac	260	pp->p_pri = pp->p_usrpri;
83be5fac	261	#endif
054016e1	262	}
83be5fac	263	}
92ca826b BJ	264	if (!BASEPRI(ps))
92ca826b BJ	265	unhang();
83be5fac BJ	266	if (USERMODE(ps)) {
	267	/*
	268	* We do this last since it
	269	* may block on a page fault in user space.
	270	*/
	271	if (u.u_prof.pr_scale)
	272	addupc(pc, &u.u_prof, 1);
	273	}
	274	#ifdef KPROF
	275	else if (!noproc) {
525dfa77	276	register int indx = ((int)pc & 0x7fffffff) / 4;
83be5fac BJ	277
83be5fac BJ	278	if (indx >= 0 && indx < 20000)
525dfa77 BJ	279	if (++kcount[indx] == 0)
525dfa77 BJ	280	--kcount[indx];
83be5fac BJ	281	}
	282	#endif
	283	}
	284
	285	/*
	286	* timeout is called to arrange that
	287	* fun(arg) is called in tim/HZ seconds.
	288	* An entry is sorted into the callout
	289	* structure. The time in each structure
	290	* entry is the number of HZ's more
	291	* than the previous entry.
	292	* In this way, decrementing the
	293	* first entry has the effect of
	294	* updating all entries.
	295	*
	296	* The panic is there because there is nothing
	297	* intelligent to be done if an entry won't fit.
	298	*/
	299	timeout(fun, arg, tim)
	300	int (*fun)();
	301	caddr_t arg;
	302	{
	303	register struct callo p1, p2;
	304	register int t;
	305	int s;
	306
	307	t = tim;
	308	p1 = &callout[0];
	309	s = spl7();
	310	while(p1->c_func != 0 && p1->c_time <= t) {
	311	t -= p1->c_time;
	312	p1++;
	313	}
	314	if (p1 >= &callout[NCALL-1])
	315	panic("Timeout table overflow");
	316	p1->c_time -= t;
	317	p2 = p1;
	318	while(p2->c_func != 0)
	319	p2++;
	320	while(p2 >= p1) {
	321	(p2+1)->c_time = p2->c_time;
	322	(p2+1)->c_func = p2->c_func;
	323	(p2+1)->c_arg = p2->c_arg;
	324	p2--;
	325	}
	326	p1->c_time = t;
	327	p1->c_func = fun;
	328	p1->c_arg = arg;
	329	splx(s);
	330	}