VFLUSHO -> VDISCARD

[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 8bbe940..1dc5898 100644 (file)
--- a/usr/src/sys/kern/kern_clock.c
+++ b/usr/src/sys/kern/kern_clock.c
@@ -1,25 +1,34 @@
-/*     kern_clock.c    6.7     84/05/22        */
-
-#include "../machine/reg.h"
-#include "../machine/psl.h"
-
-#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"
+/*
+ * Copyright (c) 1982, 1986 Regents of the University of California.
+ * All rights reserved.  The Berkeley software License Agreement
+ * specifies the terms and conditions for redistribution.
+ *
+ *     @(#)kern_clock.c        7.7 (Berkeley) %G%
+ */

 
 

-#ifdef vax
-#include "../vax/mtpr.h"
+#include "param.h"
+#include "systm.h"
+#include "dkstat.h"
+#include "callout.h"
+#include "user.h"
+#include "kernel.h"
+#include "proc.h"
+#include "vm.h"
+#include "text.h"
+
+#include "machine/reg.h"
+#include "machine/psl.h"
+
+#if defined(vax) || defined(tahoe)
+#include "machine/mtpr.h"
+#include "machine/clock.h"
+#endif
+#if defined(hp300)
+#include "machine/mtpr.h"

 #endif
 
 #ifdef GPROF
 #endif
 
 #ifdef GPROF

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

 #endif
 
 #define ADJTIME                /* For now... */
 #endif
 
 #define ADJTIME                /* For now... */


@@ -47,6 +56,19 @@ int  adjtimedelta;
  *     allocate more timeout table slots when table overflows.
  */
 
  *     allocate more timeout table slots when table overflows.
  */
 

+/*
+ * 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.
  * We update the events relating to real time.
 /*
  * The hz hardware interval timer.
  * We update the events relating to real time.


@@ -59,8 +81,8 @@ hardclock(pc, ps)
        int ps;
 {
        register struct callout *p1;
        int ps;
 {
        register struct callout *p1;

-       register struct proc *p;
-       register int s, cpstate;
+       register struct proc *p = u.u_procp;
+       register int s;

 
        /*
         * Update real-time timeout queue.
 
        /*
         * Update real-time timeout queue.


@@ -93,33 +115,16 @@ hardclock(pc, ps)
                 * user time counter, and process process-virtual time
                 * interval timer. 
                 */
                 * user time counter, and process process-virtual time
                 * interval timer. 
                 */

-               bumptime(&u.u_ru.ru_utime, tick);
+               BUMPTIME(&p->p_utime, tick);

                if (timerisset(&u.u_timer[ITIMER_VIRTUAL].it_value) &&
                    itimerdecr(&u.u_timer[ITIMER_VIRTUAL], tick) == 0)
                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;
+                       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 (!noproc)
+                       BUMPTIME(&p->p_stime, tick);

        }
 
        /*
        }
 
        /*


@@ -130,21 +135,24 @@ hardclock(pc, ps)
         * 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) >
+       if (noproc == 0) {
+               if ((p->p_utime.tv_sec+p->p_stime.tv_sec+1) >

                    u.u_rlimit[RLIMIT_CPU].rlim_cur) {
                    u.u_rlimit[RLIMIT_CPU].rlim_cur) {

-                       psignal(u.u_procp, SIGXCPU);
+                       psignal(p, 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 (timerisset(&u.u_timer[ITIMER_PROF].it_value) &&
                    itimerdecr(&u.u_timer[ITIMER_PROF], tick) == 0)
                        if (u.u_rlimit[RLIMIT_CPU].rlim_cur <
                            u.u_rlimit[RLIMIT_CPU].rlim_max)
                                u.u_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;
+                       psignal(p, SIGPROF);
+               s = p->p_rssize;
+               u.u_ru.ru_idrss += s;
+#ifdef notdef
+               u.u_ru.ru_isrss += 0;           /* XXX (haven't got this) */
+#endif
+               if (p->p_textp) {
+                       register int xrss = p->p_textp->x_rssize;

 
                        s += xrss;
                        u.u_ru.ru_ixrss += xrss;
 
                        s += xrss;
                        u.u_ru.ru_ixrss += xrss;


@@ -168,7 +176,6 @@ hardclock(pc, ps)
         * much recently, and to round-robin among other processes.
         */
        if (!noproc) {
         * much recently, and to round-robin among other processes.
         */
        if (!noproc) {

-               p = u.u_procp;

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


@@ -205,7 +212,20 @@ hardclock(pc, ps)
                }
        }
 #else
                }
        }
 #else

-       bumptime(&time, tick);
+       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();
 }
 #endif
        setsoftclock();
 }


@@ -224,7 +244,7 @@ gatherstats(pc, ps)
        caddr_t pc;
        int ps;
 {
        caddr_t pc;
        int ps;
 {

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

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


@@ -240,7 +260,14 @@ gatherstats(pc, ps)
        } else {
                /*
                 * CPU was in system state.  If profiling kernel
        } 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;
                if (noproc && BASEPRI(ps))
                 */
                cpstate = CP_SYS;
                if (noproc && BASEPRI(ps))


@@ -278,7 +305,7 @@ softclock(pc, ps)
                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;


@@ -307,7 +334,7 @@ softclock(pc, ps)
                 * reduce priority to give others a chance.
                 */
                if (p->p_uid && p->p_nice == NZERO &&
                 * reduce priority to give others a chance.
                 */
                if (p->p_uid && p->p_nice == NZERO &&

-                   u.u_ru.ru_utime.tv_sec > 10 * 60) {
+                   p->p_utime.tv_sec > 10 * 60) {

                        p->p_nice = NZERO+4;
                        (void) setpri(p);
                        p->p_pri = p->p_usrpri;
                        p->p_nice = NZERO+4;
                        (void) setpri(p);
                        p->p_pri = p->p_usrpri;


@@ -315,21 +342,6 @@ softclock(pc, ps)
        }
 }
 
        }
 }
 

-/*
- * Bump a timeval by a small number of usec's.
- */
-bumptime(tp, usec)
-       register struct timeval *tp;
-       int usec;
-{
-
-       tp->tv_usec += usec;
-       if (tp->tv_usec >= 1000000) {
-               tp->tv_usec -= 1000000;
-               tp->tv_sec++;
-       }
-}
-

 /*
  * Arrange that (*fun)(arg) is called in t/hz seconds.
  */
 /*
  * Arrange that (*fun)(arg) is called in t/hz seconds.
  */


@@ -339,9 +351,9 @@ timeout(fun, arg, t)
        register int t;
 {
        register struct callout *p1, *p2, *pnew;
        register int t;
 {
        register struct callout *p1, *p2, *pnew;

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

 
 

-       if (t == 0)
+       if (t <= 0)

                t = 1;
        pnew = callfree;
        if (pnew == NULL)
                t = 1;
        pnew = callfree;
        if (pnew == NULL)


@@ -371,7 +383,7 @@ untimeout(fun, arg)
        register struct callout *p1, *p2;
        register int s;
 
        register struct callout *p1, *p2;
        register int s;
 

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

        for (p1 = &calltodo; (p2 = p1->c_next) != 0; p1 = p2) {
                if (p2->c_func == fun && p2->c_arg == arg) {
                        if (p2->c_next && p2->c_time > 0)
        for (p1 = &calltodo; (p2 = p1->c_next) != 0; p1 = p2) {
                if (p2->c_func == fun && p2->c_arg == arg) {
                        if (p2->c_next && p2->c_time > 0)


@@ -395,7 +407,7 @@ 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,


@@ -433,10 +445,3 @@ profil()
        upp->pr_off = uap->pcoffset;
        upp->pr_scale = uap->pcscale;
 }
        upp->pr_off = uap->pcoffset;
        upp->pr_scale = uap->pcscale;
 }

-
-opause()
-{
-
-       for (;;)
-               sleep((caddr_t)&u, PSLEP);
-}