> Date: Sat, 21 Jan 2023 17:02:48 -0600
> From: Scott Cheloha <scottchel...@gmail.com>
>
> All the platforms have switched to clockintr.
>
> Let's start by isolating statclock() from hardclock(). stathz is now
> always non-zero: statclock() must be called separately. Update
> several of the the stathz users to reflect that the value is always
> non-zero.
>
> This is a first step toward making hardclock and statclock into
> schedulable entities.
>
> ok?
If you are confident enough to start burning bridges, yes ok kettenis@
Maybe you want to add
KASSERT(stathz != 0);
KASSERT(profhz != 0);
at the start of initclocks() just to be sure?
Either way is fine with me.
> Index: kern_clock.c
> ===================================================================
> RCS file: /cvs/src/sys/kern/kern_clock.c,v
> retrieving revision 1.105
> diff -u -p -r1.105 kern_clock.c
> --- kern_clock.c 14 Aug 2022 01:58:27 -0000 1.105
> +++ kern_clock.c 21 Jan 2023 22:59:34 -0000
> @@ -98,8 +98,6 @@ volatile unsigned long jiffies; /* XXX
> void
> initclocks(void)
> {
> - int i;
> -
> ticks = INT_MAX - (15 * 60 * hz);
> jiffies = ULONG_MAX - (10 * 60 * hz);
>
> @@ -111,12 +109,9 @@ initclocks(void)
> cpu_initclocks();
>
> /*
> - * Compute profhz/stathz, and fix profhz if needed.
> + * Compute profhz/stathz.
> */
> - i = stathz ? stathz : hz;
> - if (profhz == 0)
> - profhz = i;
> - psratio = profhz / i;
> + psratio = profhz / stathz;
>
> inittimecounter();
> }
> @@ -158,12 +153,6 @@ hardclock(struct clockframe *frame)
> }
> }
>
> - /*
> - * If no separate statistics clock is available, run it from here.
> - */
> - if (stathz == 0)
> - statclock(frame);
> -
> if (--ci->ci_schedstate.spc_rrticks <= 0)
> roundrobin(ci);
>
> @@ -268,7 +257,7 @@ startprofclock(struct process *pr)
>
> if ((pr->ps_flags & PS_PROFIL) == 0) {
> atomic_setbits_int(&pr->ps_flags, PS_PROFIL);
> - if (++profprocs == 1 && stathz != 0) {
> + if (++profprocs == 1) {
> s = splstatclock();
> psdiv = pscnt = psratio;
> setstatclockrate(profhz);
> @@ -287,7 +276,7 @@ stopprofclock(struct process *pr)
>
> if (pr->ps_flags & PS_PROFIL) {
> atomic_clearbits_int(&pr->ps_flags, PS_PROFIL);
> - if (--profprocs == 0 && stathz != 0) {
> + if (--profprocs == 0) {
> s = splstatclock();
> psdiv = pscnt = 1;
> setstatclockrate(stathz);
> @@ -415,6 +404,6 @@ sysctl_clockrate(char *where, size_t *si
> clkinfo.tick = tick;
> clkinfo.hz = hz;
> clkinfo.profhz = profhz;
> - clkinfo.stathz = stathz ? stathz : hz;
> + clkinfo.stathz = stathz;
> return (sysctl_rdstruct(where, sizep, newp, &clkinfo, sizeof(clkinfo)));
> }
> Index: kern_time.c
> ===================================================================
> RCS file: /cvs/src/sys/kern/kern_time.c,v
> retrieving revision 1.161
> diff -u -p -r1.161 kern_time.c
> --- kern_time.c 2 Jan 2023 23:09:48 -0000 1.161
> +++ kern_time.c 21 Jan 2023 22:59:34 -0000
> @@ -218,10 +218,9 @@ sys_clock_getres(struct proc *p, void *v
> struct timespec ts;
> struct proc *q;
> u_int64_t scale;
> - int error = 0, realstathz;
> + int error = 0;
>
> memset(&ts, 0, sizeof(ts));
> - realstathz = (stathz == 0) ? hz : stathz;
> clock_id = SCARG(uap, clock_id);
>
> switch (clock_id) {
> @@ -238,7 +237,7 @@ sys_clock_getres(struct proc *p, void *v
> break;
> case CLOCK_PROCESS_CPUTIME_ID:
> case CLOCK_THREAD_CPUTIME_ID:
> - ts.tv_nsec = 1000000000 / realstathz;
> + ts.tv_nsec = 1000000000 / stathz;
> break;
> default:
> /* check for clock from pthread_getcpuclockid() */
> @@ -248,7 +247,7 @@ sys_clock_getres(struct proc *p, void *v
> if (q == NULL)
> error = ESRCH;
> else
> - ts.tv_nsec = 1000000000 / realstathz;
> + ts.tv_nsec = 1000000000 / stathz;
> KERNEL_UNLOCK();
> } else
> error = EINVAL;
>
>
