kernel: remove schedhz

Now that alpha no longer sets schedhz, schedhz is a dead variable.
Remove it.

For now, leave the schedclock() call in place in statclock().  It
still runs at its default rate of (stathz / 4).

Part of mpi@'s WIP scheduler patch.  Suggested by mpi@.

Thread: https://marc.info/?l=openbsd-tech&m=169419781317781&w=2

ok mpi@

diff --git a/sys/kern/kern_clock.c b/sys/kern/kern_clock.c
index 22b2d60..1c8da76 100644 (file)
--- a/sys/kern/kern_clock.c
+++ b/sys/kern/kern_clock.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: kern_clock.c,v 1.115 2023/08/23 01:55:45 cheloha Exp $        */
+/*     $OpenBSD: kern_clock.c,v 1.116 2023/09/09 18:19:03 cheloha Exp $        */
 /*     $NetBSD: kern_clock.c,v 1.34 1996/06/09 04:51:03 briggs Exp $   */
 
 /*-
@@ -79,7 +79,6 @@
  */
 
 int    stathz;
-int    schedhz;
 int    profhz;
 int    profprocs;
 int    ticks = INT_MAX - (15 * 60 * HZ);
@@ -295,13 +294,10 @@ statclock(struct clockframe *frame)
        if (p != NULL) {
                p->p_cpticks++;
                /*
-                * If no schedclock is provided, call it here at ~~12-25 Hz;
-                * ~~16 Hz is best
+                * schedclock() runs every fourth statclock().
                 */
-               if (schedhz == 0) {
-                       if ((++spc->spc_schedticks & 3) == 0)
-                               schedclock(p);
-               }
+               if ((++spc->spc_schedticks & 3) == 0)
+                       schedclock(p);
        }
 }
 

diff --git a/sys/sys/sched.h b/sys/sys/sched.h
index 9b4e278..d093e1e 100644 (file)
--- a/sys/sys/sched.h
+++ b/sys/sys/sched.h
@@ -1,4 +1,4 @@
-/*     $OpenBSD: sched.h,v 1.61 2023/08/11 22:02:50 cheloha Exp $      */
+/*     $OpenBSD: sched.h,v 1.62 2023/09/09 18:19:03 cheloha Exp $      */
 /* $NetBSD: sched.h,v 1.2 1999/02/28 18:14:58 ross Exp $ */
 
 /*-
@@ -146,7 +146,6 @@ struct cpustats {
 #define        ESTCPULIM(e) min((e), NICE_WEIGHT * PRIO_MAX - SCHED_PPQ)
 
 extern uint32_t roundrobin_period;
-extern int schedhz;                    /* ideally: 16 */
 
 struct proc;
 void schedclock(struct proc *);