fixes for fp context switching

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

diff --git a/usr/src/sys/kern/kern_clock.c b/usr/src/sys/kern/kern_clock.c
index 8e56342..d979a48 100644 (file)
--- a/usr/src/sys/kern/kern_clock.c
+++ b/usr/src/sys/kern/kern_clock.c
@@ -1,34 +1,29 @@
-/*     kern_clock.c    4.52    83/03/03        */
-
-#include "../machine/reg.h"
-#include "../machine/psl.h"
+/*-
+ * Copyright (c) 1982, 1986, 1991 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * %sccs.include.redist.c%
+ *
+ *     @(#)kern_clock.c        7.16 (Berkeley) %G%
+ */

 
 

-#include "../h/param.h"
-#include "../h/systm.h"
-#include "../h/dk.h"
-#include "../h/callout.h"
-#include "../h/dir.h"
-#include "../h/user.h"
-#include "../h/kernel.h"
-#include "../h/proc.h"
-#include "../h/vm.h"
-#include "../h/text.h"
-#ifdef MUSH
-#include "../h/quota.h"
-#include "../h/share.h"
-#endif
+#include "param.h"
+#include "systm.h"
+#include "dkstat.h"
+#include "callout.h"
+#include "kernel.h"
+#include "proc.h"
+#include "resourcevar.h"

 
 

-#ifdef vax
-#include "../vax/mtpr.h"
-#endif
+#include "machine/cpu.h"

 
 #ifdef GPROF
 
 #ifdef GPROF

-#include "../h/gprof.h"
+#include "gprof.h"

 #endif
 
 #endif
 

-#ifdef KGCLOCK
-extern int phz;
-#endif
+#define ADJTIME                /* For now... */
+#define        ADJ_TICK 1000
+int    adjtimedelta;

 
 /*
  * Clock handling routines.
 
 /*
  * Clock handling routines.


@@ -47,20 +42,22 @@ extern int phz;
 
 /*
  * TODO:
 
 /*
  * TODO:

- *     * Keep more accurate statistics by simulating good interval timers.
- *     * Use the time-of-day clock on the VAX to keep more accurate time
- *       than is possible by repeated use of the interval timer.
- *     * Allocate more timeout table slots when table overflows.
- *     * Get all resource allocation to use second timer.
+ *     time of day, system/user timing, timeouts, profiling on separate timers
+ *     allocate more timeout table slots when table overflows.

  */
 
  */
 

-/* bump a timeval by a small number of usec's */
-#define        bumptime(tp, usec) \
-       (tp)->tv_usec += usec; \
-       if ((tp)->tv_usec >= 1000000) { \
-               (tp)->tv_usec -= 1000000; \
-               (tp)->tv_sec++; \
-       }
+/*
+ * Bump a timeval by a small number of usec's.
+ */
+#define BUMPTIME(t, usec) { \
+       register struct timeval *tp = (t); \
+ \
+       tp->tv_usec += (usec); \
+       if (tp->tv_usec >= 1000000) { \
+               tp->tv_usec -= 1000000; \
+               tp->tv_sec++; \
+       } \
+}

 
 /*
  * The hz hardware interval timer.
 
 /*
  * The hz hardware interval timer.


@@ -68,28 +65,14 @@ extern int phz;
  * If this timer is also being used to gather statistics,
  * we run through the statistics gathering routine as well.
  */
  * If this timer is also being used to gather statistics,
  * we run through the statistics gathering routine as well.
  */

-/*ARGSUSED*/
-#ifdef vax
-hardclock(pc, ps)
-       caddr_t pc;
-       int ps;
+hardclock(frame)
+       clockframe frame;

 {
 {

-#endif
-#ifdef sun
-hardclock(regs)
-       struct regs regs;
-{
-       int ps = regs.r_sr;
-       caddr_t pc = (caddr_t)regs.r_pc;
-#endif

        register struct callout *p1;
        register struct callout *p1;

-       register struct proc *p;
-       register int s, cpstate;
+       register struct proc *p = curproc;
+       register struct pstats *pstats;
+       register int s;

 
 

-#ifdef sun
-       if (USERMODE(ps))               /* aston needs ar0 */
-               u.u_ar0 = &regs.r_r0;
-#endif

        /*
         * Update real-time timeout queue.
         * At front of queue are some number of events which are ``due''.
        /*
         * Update real-time timeout queue.
         * At front of queue are some number of events which are ``due''.


@@ -100,50 +83,42 @@ hardclock(regs)
         * Decrementing just the first of these serves to decrement the time
         * to all events.
         */
         * Decrementing just the first of these serves to decrement the time
         * to all events.
         */

-       for (p1 = calltodo.c_next; p1 && p1->c_time <= 0; p1 = p1->c_next)
-               --p1->c_time;
-       if (p1)
-               --p1->c_time;
+       p1 = calltodo.c_next;
+       while (p1) {
+               if (--p1->c_time > 0)
+                       break;
+               if (p1->c_time == 0)
+                       break;
+               p1 = p1->c_next;
+       }

 
 

+       /*
+        * Curproc (now in p) is null if no process is running.
+        * We assume that curproc is set in user mode!
+        */
+       if (p)
+               pstats = p->p_stats;

        /*
         * Charge the time out based on the mode the cpu is in.
         * Here again we fudge for the lack of proper interval timers
         * assuming that the current state has been around at least
         * one tick.
         */
        /*
         * Charge the time out based on the mode the cpu is in.
         * Here again we fudge for the lack of proper interval timers
         * assuming that the current state has been around at least
         * one tick.
         */

-       if (USERMODE(ps)) {

                /*
                 * CPU was in user state.  Increment
                 * user time counter, and process process-virtual time
                 * interval timer. 
                 */
                /*
                 * CPU was in user state.  Increment
                 * user time counter, and process process-virtual time
                 * interval timer. 
                 */

-               bumptime(&u.u_ru.ru_utime, tick);
-               if (timerisset(&u.u_timer[ITIMER_VIRTUAL].it_value) &&
-                   itimerdecr(&u.u_timer[ITIMER_VIRTUAL], tick) == 0)
-                       psignal(u.u_procp, SIGVTALRM);
-               if (u.u_procp->p_nice > NZERO)
-                       cpstate = CP_NICE;
-               else
-                       cpstate = CP_USER;
+               BUMPTIME(&p->p_utime, tick);
+               if (timerisset(&pstats->p_timer[ITIMER_VIRTUAL].it_value) &&
+                   itimerdecr(&pstats->p_timer[ITIMER_VIRTUAL], tick) == 0)
+                       psignal(p, SIGVTALRM);

        } else {
                /*
        } else {
                /*

-                * CPU was in system state.  If profiling kernel
-                * increment a counter.  If no process is running
-                * then this is a system tick if we were running
-                * at a non-zero IPL (in a driver).  If a process is running,
-                * then we charge it with system time even if we were
-                * at a non-zero IPL, since the system often runs
-                * this way during processing of system calls.
-                * This is approximate, but the lack of true interval
-                * timers makes doing anything else difficult.
+                * CPU was in system state.

                 */
                 */

-               cpstate = CP_SYS;
-               if (noproc) {
-                       if (BASEPRI(ps))
-                               cpstate = CP_IDLE;
-               } else {
-                       bumptime(&u.u_ru.ru_stime, tick);
-               }
+               if (p)
+                       BUMPTIME(&p->p_stime, tick);

        }
 
        /*
        }
 
        /*


@@ -154,74 +129,49 @@ hardclock(regs)
         * This assumes that the current process has been running
         * the entire last tick.
         */
         * This assumes that the current process has been running
         * the entire last tick.
         */

-       if (noproc == 0 && cpstate != CP_IDLE) {
-               if ((u.u_ru.ru_utime.tv_sec+u.u_ru.ru_stime.tv_sec+1) >
-                   u.u_rlimit[RLIMIT_CPU].rlim_cur) {
-                       psignal(u.u_procp, SIGXCPU);
-                       if (u.u_rlimit[RLIMIT_CPU].rlim_cur <
-                           u.u_rlimit[RLIMIT_CPU].rlim_max)
-                               u.u_rlimit[RLIMIT_CPU].rlim_cur += 5;
+       if (p) {
+               if ((p->p_utime.tv_sec+p->p_stime.tv_sec+1) >
+                   p->p_rlimit[RLIMIT_CPU].rlim_cur) {
+                       psignal(p, SIGXCPU);
+                       if (p->p_rlimit[RLIMIT_CPU].rlim_cur <
+                           p->p_rlimit[RLIMIT_CPU].rlim_max)
+                               p->p_rlimit[RLIMIT_CPU].rlim_cur += 5;

                }
                }

-               if (timerisset(&u.u_timer[ITIMER_PROF].it_value) &&
-                   itimerdecr(&u.u_timer[ITIMER_PROF], tick) == 0)
-                       psignal(u.u_procp, SIGPROF);
-               s = u.u_procp->p_rssize;
-               u.u_ru.ru_idrss += s; u.u_ru.ru_isrss += 0;     /* XXX */
-               if (u.u_procp->p_textp) {
-                       register int xrss = u.u_procp->p_textp->x_rssize;
+               if (timerisset(&pstats->p_timer[ITIMER_PROF].it_value) &&
+                   itimerdecr(&pstats->p_timer[ITIMER_PROF], tick) == 0)
+                       psignal(p, SIGPROF);

 
 

-                       s += xrss;
-                       u.u_ru.ru_ixrss += xrss;
-               }
-               if (s > u.u_ru.ru_maxrss)
-                       u.u_ru.ru_maxrss = s;
-       }
-
-       /*
-        * We adjust the priority of the current process.
-        * The priority of a process gets worse as it accumulates
-        * CPU time.  The cpu usage estimator (p_cpu) is increased here
-        * and the formula for computing priorities (in kern_synch.c)
-        * will compute a different value each time the p_cpu increases
-        * by 4.  The cpu usage estimator ramps up quite quickly when
-        * the process is running (linearly), and decays away exponentially,
-        * at a rate which is proportionally slower when the system is
-        * busy.  The basic principal is that the system will 90% forget
-        * that a process used a lot of CPU time in 5*loadav seconds.
-        * This causes the system to favor processes which haven't run
-        * much recently, and to round-robin among other processes.
-        */
-       if (!noproc) {
-               p = u.u_procp;
+               /*
+                * We adjust the priority of the current process.
+                * The priority of a process gets worse as it accumulates
+                * CPU time.  The cpu usage estimator (p_cpu) is increased here
+                * and the formula for computing priorities (in kern_synch.c)
+                * will compute a different value each time the p_cpu increases
+                * by 4.  The cpu usage estimator ramps up quite quickly when
+                * the process is running (linearly), and decays away
+                * exponentially, * at a rate which is proportionally slower
+                * when the system is busy.  The basic principal is that the
+                * system will 90% forget that a process used a lot of CPU
+                * time in 5*loadav seconds.  This causes the system to favor
+                * processes which haven't run much recently, and to
+                * round-robin among other processes.
+                */

                p->p_cpticks++;
                if (++p->p_cpu == 0)
                        p->p_cpu--;
                p->p_cpticks++;
                if (++p->p_cpu == 0)
                        p->p_cpu--;

-#ifdef MUSH
-               p->p_quota->q_cost += (p->p_nice > NZERO ?
-                   (shconsts.sc_tic * ((2*NZERO)-p->p_nice)) / NZERO :
-                   shconsts.sc_tic) * (((int)avenrun[0]+2)/3);
-#endif

                if ((p->p_cpu&3) == 0) {
                if ((p->p_cpu&3) == 0) {

-                       (void) setpri(p);
+                       setpri(p);

                        if (p->p_pri >= PUSER)
                                p->p_pri = p->p_usrpri;
                }
        }
 
                        if (p->p_pri >= PUSER)
                                p->p_pri = p->p_usrpri;
                }
        }
 

-       /*
-        * If this is the only timer then we have to use it to
-        * gather statistics.
-        */
-#ifndef KGCLOCK
-       gatherstats(pc, ps);
-#else

        /*
         * If the alternate clock has not made itself known then
         * we must gather the statistics.
         */
        if (phz == 0)
        /*
         * If the alternate clock has not made itself known then
         * we must gather the statistics.
         */
        if (phz == 0)

-               gatherstats(pc, ps);
-#endif
+               gatherstats(&frame);

 
        /*
         * Increment the time-of-day, and schedule
 
        /*
         * Increment the time-of-day, and schedule


@@ -229,10 +179,38 @@ hardclock(regs)
         * so we don't keep the relatively high clock interrupt
         * priority any longer than necessary.
         */
         * so we don't keep the relatively high clock interrupt
         * priority any longer than necessary.
         */

-       bumptime(&time, tick);
+#ifdef ADJTIME
+       if (adjtimedelta == 0)
+               bumptime(&time, tick);
+       else {
+               if (adjtimedelta < 0) {
+                       bumptime(&time, tick-ADJ_TICK);
+                       adjtimedelta++;
+               } else {
+                       bumptime(&time, tick+ADJ_TICK);
+                       adjtimedelta--;
+               }
+       }
+#else
+       if (timedelta == 0)
+               BUMPTIME(&time, tick)
+       else {
+               register delta;
+
+               if (timedelta < 0) {
+                       delta = tick - tickdelta;
+                       timedelta += tickdelta;
+               } else {
+                       delta = tick + tickdelta;
+                       timedelta -= tickdelta;
+               }
+               BUMPTIME(&time, delta);
+       }
+#endif

        setsoftclock();
 }
 
        setsoftclock();
 }
 

+int    dk_ndrive = DK_NDRIVE;

 /*
  * Gather statistics on resource utilization.
  *
 /*
  * Gather statistics on resource utilization.
  *


@@ -241,33 +219,39 @@ hardclock(regs)
  * or idle state) for the entire last time interval, and
  * update statistics accordingly.
  */
  * or idle state) for the entire last time interval, and
  * update statistics accordingly.
  */

-gatherstats(pc, ps)
-       caddr_t pc;
-       int ps;
+gatherstats(framep)
+       clockframe *framep;

 {
 {

-       int cpstate, s;
+       register int cpstate, s;

 
        /*
         * Determine what state the cpu is in.
         */
 
        /*
         * Determine what state the cpu is in.
         */

-       if (USERMODE(ps)) {
+       if (CLKF_USERMODE(framep)) {

                /*
                 * CPU was in user state.
                 */
                /*
                 * CPU was in user state.
                 */

-               if (u.u_procp->p_nice > NZERO)
+               if (curproc->p_nice > NZERO)

                        cpstate = CP_NICE;
                else
                        cpstate = CP_USER;
        } else {
                /*
                 * CPU was in system state.  If profiling kernel
                        cpstate = CP_NICE;
                else
                        cpstate = CP_USER;
        } else {
                /*
                 * CPU was in system state.  If profiling kernel

-                * increment a counter.
+                * increment a counter.  If no process is running
+                * then this is a system tick if we were running
+                * at a non-zero IPL (in a driver).  If a process is running,
+                * then we charge it with system time even if we were
+                * at a non-zero IPL, since the system often runs
+                * this way during processing of system calls.
+                * This is approximate, but the lack of true interval
+                * timers makes doing anything else difficult.

                 */
                cpstate = CP_SYS;
                 */
                cpstate = CP_SYS;

-               if (noproc && BASEPRI(ps))
+               if (curproc == NULL && CLKF_BASEPRI(framep))

                        cpstate = CP_IDLE;
 #ifdef GPROF
                        cpstate = CP_IDLE;
 #ifdef GPROF

-               s = pc - s_lowpc;
+               s = CLKF_PC(framep) - s_lowpc;

                if (profiling < 2 && s < s_textsize)
                        kcount[s / (HISTFRACTION * sizeof (*kcount))]++;
 #endif
                if (profiling < 2 && s < s_textsize)
                        kcount[s / (HISTFRACTION * sizeof (*kcount))]++;
 #endif


@@ -288,18 +272,9 @@ gatherstats(pc, ps)
  * Run periodic events from timeout queue.
  */
 /*ARGSUSED*/
  * Run periodic events from timeout queue.
  */
 /*ARGSUSED*/

-#ifdef vax
-softclock(pc, ps)
-       caddr_t pc;
-       int ps;
+softclock(frame)
+       clockframe frame;

 {
 {

-#endif
-#ifdef sun
-softclock()
-{
-       int ps = u.u_ar0[PS];
-       caddr_t pc = (caddr_t)u.u_ar0[PC];
-#endif

 
        for (;;) {
                register struct callout *p1;
 
        for (;;) {
                register struct callout *p1;


@@ -307,7 +282,7 @@ softclock()
                register int (*func)();
                register int a, s;
 
                register int (*func)();
                register int a, s;
 

-               s = spl7();
+               s = splhigh();

                if ((p1 = calltodo.c_next) == 0 || p1->c_time > 0) {
                        splx(s);
                        break;
                if ((p1 = calltodo.c_next) == 0 || p1->c_time > 0) {
                        splx(s);
                        break;


@@ -320,34 +295,47 @@ softclock()
                (*func)(arg, a);
        }
        /*
                (*func)(arg, a);
        }
        /*

-        * If trapped user-mode, give it a profiling tick.
+        * If trapped user-mode and profiling, give it
+        * a profiling tick.

         */
         */

-       if (USERMODE(ps) && u.u_prof.pr_scale) {
-               u.u_procp->p_flag |= SOWEUPC;
-               aston();
+       if (CLKF_USERMODE(&frame)) {
+               register struct proc *p = curproc;
+
+               if (p->p_stats->p_prof.pr_scale)
+                       profile_tick(p, &frame);
+               /*
+                * Check to see if process has accumulated
+                * more than 10 minutes of user time.  If so
+                * reduce priority to give others a chance.
+                */
+               if (p->p_ucred->cr_uid && p->p_nice == NZERO &&
+                   p->p_utime.tv_sec > 10 * 60) {
+                       p->p_nice = NZERO + 4;
+                       setpri(p);
+                       p->p_pri = p->p_usrpri;
+               }

        }
 }
 
 /*
        }
 }
 
 /*

- * Arrange that (*fun)(arg) is called in tim/hz seconds.
+ * Arrange that (*func)(arg) is called in t/hz seconds.

  */
  */

-timeout(fun, arg, tim)
-       int (*fun)();
+timeout(func, arg, t)
+       int (*func)();

        caddr_t arg;
        caddr_t arg;

-       int tim;
+       register int t;

 {
        register struct callout *p1, *p2, *pnew;
 {
        register struct callout *p1, *p2, *pnew;

-       register int t;
-       int s;
+       register int s = splhigh();

 
 

-       t = tim;
-       s = spl7();
+       if (t <= 0)
+               t = 1;

        pnew = callfree;
        if (pnew == NULL)
                panic("timeout table overflow");
        callfree = pnew->c_next;
        pnew->c_arg = arg;
        pnew = callfree;
        if (pnew == NULL)
                panic("timeout table overflow");
        callfree = pnew->c_next;
        pnew->c_arg = arg;

-       pnew->c_func = fun;
+       pnew->c_func = func;

        for (p1 = &calltodo; (p2 = p1->c_next) && p2->c_time < t; p1 = p2)
                if (p2->c_time > 0)
                        t -= p2->c_time;
        for (p1 = &calltodo; (p2 = p1->c_next) && p2->c_time < t; p1 = p2)
                if (p2->c_time > 0)
                        t -= p2->c_time;


@@ -363,16 +351,16 @@ timeout(fun, arg, tim)
  * untimeout is called to remove a function timeout call
  * from the callout structure.
  */
  * untimeout is called to remove a function timeout call
  * from the callout structure.
  */

-untimeout(fun, arg)
-       int (*fun)();
+untimeout(func, arg)
+       int (*func)();

        caddr_t arg;
 {
        register struct callout *p1, *p2;
        register int s;
 
        caddr_t arg;
 {
        register struct callout *p1, *p2;
        register int s;
 

-       s = spl7();
+       s = splhigh();

        for (p1 = &calltodo; (p2 = p1->c_next) != 0; p1 = p2) {
        for (p1 = &calltodo; (p2 = p1->c_next) != 0; p1 = p2) {

-               if (p2->c_func == fun && p2->c_arg == arg) {
+               if (p2->c_func == func && p2->c_arg == arg) {

                        if (p2->c_next && p2->c_time > 0)
                                p2->c_next->c_time += p2->c_time;
                        p1->c_next = p2->c_next;
                        if (p2->c_next && p2->c_time > 0)
                                p2->c_next->c_time += p2->c_time;
                        p1->c_next = p2->c_next;


@@ -394,7 +382,7 @@ hzto(tv)
 {
        register long ticks;
        register long sec;
 {
        register long ticks;
        register long sec;

-       int s = spl7();
+       int s = splhigh();

 
        /*
         * If number of milliseconds will fit in 32 bit arithmetic,
 
        /*
         * If number of milliseconds will fit in 32 bit arithmetic,