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clockintr: switch from callee- to caller-allocated clockintr structs

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Currently, clockintr_establish() calls malloc(9) to allocate a
clockintr struct on behalf of the caller.  mpi@ says this behavior is
incompatible with dt(4).  In particular, calling malloc(9) during the
initialization of a PCB outside of dt_pcb_alloc() is (a) awkward and
(b) may conflict with future changes/optimizations to PCB allocation.

To side-step the problem, this patch changes the clockintr subsystem
to use caller-allocated clockintr structs instead of callee-allocated
structs.

clockintr_establish() is named after softintr_establish(), which uses
malloc(9) internally to create softintr objects.  The clockintr subsystem
is no longer using malloc(9), so the "establish" naming is no longer apt.
To avoid confusion, this patch also renames "clockintr_establish" to
"clockintr_bind".

Requested by mpi@.  Tweaked by mpi@.

Thread: https://marc.info/?l=openbsd-tech&m=170597126103504&w=2

ok claudio@ mlarkin@ mpi@
This commit is contained in:
cheloha 2024-01-24 19:23:38 +00:00
parent 13e262cf28
commit 1d970828bc
19 changed files with 77 additions and 95 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
sys/arch/alpha/include/cpu.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: cpu.h,v 1.70 2023/07/25 18:16:19 cheloha Exp $ */
/* $OpenBSD: cpu.h,v 1.71 2024/01/24 19:23:38 cheloha Exp $ */
/* $NetBSD: cpu.h,v 1.45 2000/08/21 02:03:12 thorpej Exp $ */
/*-
@ -212,7 +212,7 @@ struct cpu_info {
#endif
#ifdef GPROF
struct gmonparam *ci_gmon;
struct clockintr *ci_gmonclock;
struct clockintr ci_gmonclock;
#endif
struct clockintr_queue ci_queue;
char ci_panicbuf[512];

4
sys/arch/amd64/include/cpu.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: cpu.h,v 1.159 2023/08/23 01:55:46 cheloha Exp $ */
/* $OpenBSD: cpu.h,v 1.160 2024/01/24 19:23:39 cheloha Exp $ */
/* $NetBSD: cpu.h,v 1.1 2003/04/26 18:39:39 fvdl Exp $ */
/*-
@ -208,7 +208,7 @@ struct cpu_info {
u_int64_t ci_hz_aperf;
#if defined(GPROF) || defined(DDBPROF)
struct gmonparam *ci_gmon;
struct clockintr *ci_gmonclock;
struct clockintr ci_gmonclock;
#endif
u_int32_t ci_vmm_flags;
#define CI_VMM_VMX (1 << 0)

4
sys/arch/arm/include/cpu.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: cpu.h,v 1.64 2023/08/23 01:55:46 cheloha Exp $ */
/* $OpenBSD: cpu.h,v 1.65 2024/01/24 19:23:39 cheloha Exp $ */
/* $NetBSD: cpu.h,v 1.34 2003/06/23 11:01:08 martin Exp $ */
/*
@ -198,7 +198,7 @@ struct cpu_info {
#ifdef GPROF
struct gmonparam *ci_gmon;
struct clockintr *ci_gmonclock;
struct clockintr ci_gmonclock;
#endif
struct clockintr_queue ci_queue;
char ci_panicbuf[512];

4
sys/arch/arm64/include/cpu.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: cpu.h,v 1.41 2024/01/15 11:58:45 kettenis Exp $ */
/* $OpenBSD: cpu.h,v 1.42 2024/01/24 19:23:39 cheloha Exp $ */
/*
* Copyright (c) 2016 Dale Rahn <drahn@dalerahn.com>
*
@ -174,7 +174,7 @@ struct cpu_info {
#ifdef GPROF
struct gmonparam *ci_gmon;
struct clockintr *ci_gmonclock;
struct clockintr ci_gmonclock;
#endif
struct clockintr_queue ci_queue;
char ci_panicbuf[512];

4
sys/arch/hppa/include/cpu.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: cpu.h,v 1.102 2023/11/05 16:33:50 miod Exp $ */
/* $OpenBSD: cpu.h,v 1.103 2024/01/24 19:23:39 cheloha Exp $ */
/*
* Copyright (c) 2000-2004 Michael Shalayeff
@ -113,7 +113,7 @@ struct cpu_info {
#endif
#ifdef GPROF
struct gmonparam *ci_gmon;
struct clockintr *ci_gmonclock;
struct clockintr ci_gmonclock;
#endif
struct clockintr_queue ci_queue;
char ci_panicbuf[512];

4
sys/arch/i386/include/cpu.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: cpu.h,v 1.183 2023/08/23 01:55:46 cheloha Exp $ */
/* $OpenBSD: cpu.h,v 1.184 2024/01/24 19:23:39 cheloha Exp $ */
/* $NetBSD: cpu.h,v 1.35 1996/05/05 19:29:26 christos Exp $ */
/*-
@ -168,7 +168,7 @@ struct cpu_info {
struct ksensor ci_sensor;
#if defined(GPROF) || defined(DDBPROF)
struct gmonparam *ci_gmon;
struct clockintr *ci_gmonclock;
struct clockintr ci_gmonclock;
#endif
struct clockintr_queue ci_queue;
char ci_panicbuf[512];

4
sys/arch/m88k/include/cpu.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: cpu.h,v 1.73 2023/07/25 18:16:20 cheloha Exp $ */
/* $OpenBSD: cpu.h,v 1.74 2024/01/24 19:23:39 cheloha Exp $ */
/*
* Copyright (c) 1996 Nivas Madhur
* Copyright (c) 1992, 1993
@ -177,7 +177,7 @@ struct cpu_info {
#endif
#ifdef GPROF
struct gmonparam *ci_gmon;
struct clockintr *ci_gmonclock;
struct clockintr ci_gmonclock;
#endif
struct clockintr_queue ci_queue;
char ci_panicbuf[512];

4
sys/arch/mips64/include/cpu.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: cpu.h,v 1.144 2023/08/23 01:55:47 cheloha Exp $ */
/* $OpenBSD: cpu.h,v 1.145 2024/01/24 19:23:39 cheloha Exp $ */
/*-
* Copyright (c) 1992, 1993
@ -200,7 +200,7 @@ struct cpu_info {
#endif
#ifdef GPROF
struct gmonparam *ci_gmon;
struct clockintr *ci_gmonclock;
struct clockintr ci_gmonclock;
#endif
char ci_panicbuf[512];
};

4
sys/arch/powerpc/include/cpu.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: cpu.h,v 1.75 2023/07/25 18:16:20 cheloha Exp $ */
/* $OpenBSD: cpu.h,v 1.76 2024/01/24 19:23:39 cheloha Exp $ */
/* $NetBSD: cpu.h,v 1.1 1996/09/30 16:34:21 ws Exp $ */
/*
@ -89,7 +89,7 @@ struct cpu_info {
#endif
#ifdef GPROF
struct gmonparam *ci_gmon;
struct clockintr *ci_gmonclock;
struct clockintr ci_gmonclock;
#endif
char ci_panicbuf[512];
};

4
sys/arch/riscv64/include/cpu.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: cpu.h,v 1.19 2023/09/19 19:20:33 kettenis Exp $ */
/* $OpenBSD: cpu.h,v 1.20 2024/01/24 19:23:39 cheloha Exp $ */
/*
* Copyright (c) 2019 Mike Larkin <mlarkin@openbsd.org>
@ -124,7 +124,7 @@ struct cpu_info {
#ifdef GPROF
struct gmonparam *ci_gmon;
struct clockintr *ci_gmonclock;
struct clockintr ci_gmonclock;
#endif
char ci_panicbuf[512];

4
sys/arch/sh/include/cpu.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: cpu.h,v 1.35 2023/07/25 18:16:21 cheloha Exp $ */
/* $OpenBSD: cpu.h,v 1.36 2024/01/24 19:23:39 cheloha Exp $ */
/* $NetBSD: cpu.h,v 1.41 2006/01/21 04:24:12 uwe Exp $ */
/*-
@ -68,7 +68,7 @@ struct cpu_info {
#endif
#ifdef GPROF
struct gmonparam *ci_gmon;
struct clockintr *ci_gmonclock;
struct clockintr ci_gmonclock;
#endif
int ci_want_resched;

4
sys/arch/sparc64/include/cpu.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: cpu.h,v 1.102 2023/07/25 18:16:21 cheloha Exp $ */
/* $OpenBSD: cpu.h,v 1.103 2024/01/24 19:23:39 cheloha Exp $ */
/* $NetBSD: cpu.h,v 1.28 2001/06/14 22:56:58 thorpej Exp $ */
/*
@ -165,7 +165,7 @@ struct cpu_info {
#endif
#ifdef GPROF
struct gmonparam *ci_gmon;
struct clockintr *ci_gmonclock;
struct clockintr ci_gmonclock;
#endif
char ci_panicbuf[512];
};

49
sys/kern/kern_clockintr.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: kern_clockintr.c,v 1.63 2024/01/15 01:15:37 cheloha Exp $ */
/* $OpenBSD: kern_clockintr.c,v 1.64 2024/01/24 19:23:38 cheloha Exp $ */
/*
* Copyright (c) 2003 Dale Rahn <drahn@openbsd.org>
* Copyright (c) 2020 Mark Kettenis <kettenis@openbsd.org>
@ -62,11 +62,9 @@ clockintr_cpu_init(const struct intrclock *ic)
clockqueue_intrclock_install(cq, ic);
/* TODO: Remove this from struct clockintr_queue. */
if (cq->cq_hardclock == NULL) {
cq->cq_hardclock = clockintr_establish(ci, clockintr_hardclock,
if (cq->cq_hardclock.cl_expiration == 0) {
clockintr_bind(&cq->cq_hardclock, ci, clockintr_hardclock,
NULL);
if (cq->cq_hardclock == NULL)
panic("%s: failed to establish hardclock", __func__);
}
/*
@ -96,16 +94,16 @@ clockintr_cpu_init(const struct intrclock *ic)
* behalf.
*/
if (CPU_IS_PRIMARY(ci)) {
if (cq->cq_hardclock->cl_expiration == 0)
clockintr_schedule(cq->cq_hardclock, 0);
if (cq->cq_hardclock.cl_expiration == 0)
clockintr_schedule(&cq->cq_hardclock, 0);
else
clockintr_advance(cq->cq_hardclock, hardclock_period);
clockintr_advance(&cq->cq_hardclock, hardclock_period);
} else {
if (cq->cq_hardclock->cl_expiration == 0) {
clockintr_stagger(cq->cq_hardclock, hardclock_period,
if (cq->cq_hardclock.cl_expiration == 0) {
clockintr_stagger(&cq->cq_hardclock, hardclock_period,
multiplier, MAXCPUS);
}
clockintr_advance(cq->cq_hardclock, hardclock_period);
clockintr_advance(&cq->cq_hardclock, hardclock_period);
}
/*
@ -113,30 +111,30 @@ clockintr_cpu_init(const struct intrclock *ic)
* stagger a randomized statclock.
*/
if (!statclock_is_randomized) {
if (spc->spc_statclock->cl_expiration == 0) {
clockintr_stagger(spc->spc_statclock, statclock_avg,
if (spc->spc_statclock.cl_expiration == 0) {
clockintr_stagger(&spc->spc_statclock, statclock_avg,
multiplier, MAXCPUS);
}
}
clockintr_advance(spc->spc_statclock, statclock_avg);
clockintr_advance(&spc->spc_statclock, statclock_avg);
/*
* XXX Need to find a better place to do this. We can't do it in
* sched_init_cpu() because initclocks() runs after it.
*/
if (spc->spc_itimer->cl_expiration == 0) {
clockintr_stagger(spc->spc_itimer, hardclock_period,
if (spc->spc_itimer.cl_expiration == 0) {
clockintr_stagger(&spc->spc_itimer, hardclock_period,
multiplier, MAXCPUS);
}
if (spc->spc_profclock->cl_expiration == 0) {
clockintr_stagger(spc->spc_profclock, profclock_period,
if (spc->spc_profclock.cl_expiration == 0) {
clockintr_stagger(&spc->spc_profclock, profclock_period,
multiplier, MAXCPUS);
}
if (spc->spc_roundrobin->cl_expiration == 0) {
clockintr_stagger(spc->spc_roundrobin, hardclock_period,
if (spc->spc_roundrobin.cl_expiration == 0) {
clockintr_stagger(&spc->spc_roundrobin, hardclock_period,
multiplier, MAXCPUS);
}
clockintr_advance(spc->spc_roundrobin, roundrobin_period);
clockintr_advance(&spc->spc_roundrobin, roundrobin_period);
if (reset_cq_intrclock)
SET(cq->cq_flags, CQ_INTRCLOCK);
@ -337,16 +335,12 @@ clockintr_cancel(struct clockintr *cl)
mtx_leave(&cq->cq_mtx);
}
struct clockintr *
clockintr_establish(struct cpu_info *ci,
void
clockintr_bind(struct clockintr *cl, struct cpu_info *ci,
void (*func)(struct clockrequest *, void *, void *), void *arg)
{
struct clockintr *cl;
struct clockintr_queue *cq = &ci->ci_queue;
cl = malloc(sizeof *cl, M_DEVBUF, M_NOWAIT | M_ZERO);
if (cl == NULL)
return NULL;
cl->cl_arg = arg;
cl->cl_func = func;
cl->cl_queue = cq;
@ -354,7 +348,6 @@ clockintr_establish(struct cpu_info *ci,
mtx_enter(&cq->cq_mtx);
TAILQ_INSERT_TAIL(&cq->cq_all, cl, cl_alink);
mtx_leave(&cq->cq_mtx);
return cl;
}
void

6
sys/kern/kern_fork.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: kern_fork.c,v 1.256 2024/01/19 01:43:26 bluhm Exp $ */
/* $OpenBSD: kern_fork.c,v 1.257 2024/01/24 19:23:38 cheloha Exp $ */
/* $NetBSD: kern_fork.c,v 1.29 1996/02/09 18:59:34 christos Exp $ */
/*
@ -704,11 +704,11 @@ proc_trampoline_mi(void)
/* Start any optional clock interrupts needed by the thread. */
if (ISSET(p->p_p->ps_flags, PS_ITIMER)) {
atomic_setbits_int(&spc->spc_schedflags, SPCF_ITIMER);
clockintr_advance(spc->spc_itimer, hardclock_period);
clockintr_advance(&spc->spc_itimer, hardclock_period);
}
if (ISSET(p->p_p->ps_flags, PS_PROFIL)) {
atomic_setbits_int(&spc->spc_schedflags, SPCF_PROFCLOCK);
clockintr_advance(spc->spc_profclock, profclock_period);
clockintr_advance(&spc->spc_profclock, profclock_period);
}
nanouptime(&spc->spc_runtime);

22
sys/kern/kern_sched.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: kern_sched.c,v 1.93 2023/10/24 13:20:11 claudio Exp $ */
/* $OpenBSD: kern_sched.c,v 1.94 2024/01/24 19:23:38 cheloha Exp $ */
/*
* Copyright (c) 2007, 2008 Artur Grabowski <art@openbsd.org>
*
@ -88,18 +88,10 @@ sched_init_cpu(struct cpu_info *ci)
spc->spc_idleproc = NULL;
spc->spc_itimer = clockintr_establish(ci, itimer_update, NULL);
if (spc->spc_itimer == NULL)
panic("%s: clockintr_establish itimer_update", __func__);
spc->spc_profclock = clockintr_establish(ci, profclock, NULL);
if (spc->spc_profclock == NULL)
panic("%s: clockintr_establish profclock", __func__);
spc->spc_roundrobin = clockintr_establish(ci, roundrobin, NULL);
if (spc->spc_roundrobin == NULL)
panic("%s: clockintr_establish roundrobin", __func__);
spc->spc_statclock = clockintr_establish(ci, statclock, NULL);
if (spc->spc_statclock == NULL)
panic("%s: clockintr_establish statclock", __func__);
clockintr_bind(&spc->spc_itimer, ci, itimer_update, NULL);
clockintr_bind(&spc->spc_profclock, ci, profclock, NULL);
clockintr_bind(&spc->spc_roundrobin, ci, roundrobin, NULL);
clockintr_bind(&spc->spc_statclock, ci, statclock, NULL);
kthread_create_deferred(sched_kthreads_create, ci);
@ -244,11 +236,11 @@ sched_toidle(void)
if (ISSET(spc->spc_schedflags, SPCF_ITIMER)) {
atomic_clearbits_int(&spc->spc_schedflags, SPCF_ITIMER);
clockintr_cancel(spc->spc_itimer);
clockintr_cancel(&spc->spc_itimer);
}
if (ISSET(spc->spc_schedflags, SPCF_PROFCLOCK)) {
atomic_clearbits_int(&spc->spc_schedflags, SPCF_PROFCLOCK);
clockintr_cancel(spc->spc_profclock);
clockintr_cancel(&spc->spc_profclock);
}
atomic_clearbits_int(&spc->spc_schedflags, SPCF_SWITCHCLEAR);

10
sys/kern/sched_bsd.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: sched_bsd.c,v 1.89 2023/10/17 00:04:02 cheloha Exp $ */
/* $OpenBSD: sched_bsd.c,v 1.90 2024/01/24 19:23:38 cheloha Exp $ */
/* $NetBSD: kern_synch.c,v 1.37 1996/04/22 01:38:37 christos Exp $ */
/*-
@ -396,11 +396,11 @@ mi_switch(void)
/* Stop any optional clock interrupts. */
if (ISSET(spc->spc_schedflags, SPCF_ITIMER)) {
atomic_clearbits_int(&spc->spc_schedflags, SPCF_ITIMER);
clockintr_cancel(spc->spc_itimer);
clockintr_cancel(&spc->spc_itimer);
}
if (ISSET(spc->spc_schedflags, SPCF_PROFCLOCK)) {
atomic_clearbits_int(&spc->spc_schedflags, SPCF_PROFCLOCK);
clockintr_cancel(spc->spc_profclock);
clockintr_cancel(&spc->spc_profclock);
}
/*
@ -451,11 +451,11 @@ mi_switch(void)
/* Start any optional clock interrupts needed by the thread. */
if (ISSET(p->p_p->ps_flags, PS_ITIMER)) {
atomic_setbits_int(&spc->spc_schedflags, SPCF_ITIMER);
clockintr_advance(spc->spc_itimer, hardclock_period);
clockintr_advance(&spc->spc_itimer, hardclock_period);
}
if (ISSET(p->p_p->ps_flags, PS_PROFIL)) {
atomic_setbits_int(&spc->spc_schedflags, SPCF_PROFCLOCK);
clockintr_advance(spc->spc_profclock, profclock_period);
clockintr_advance(&spc->spc_profclock, profclock_period);
}
nanouptime(&spc->spc_runtime);

17
sys/kern/subr_prof.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: subr_prof.c,v 1.40 2023/10/17 00:04:02 cheloha Exp $ */
/* $OpenBSD: subr_prof.c,v 1.41 2024/01/24 19:23:38 cheloha Exp $ */
/* $NetBSD: subr_prof.c,v 1.12 1996/04/22 01:38:50 christos Exp $ */
/*-
@ -101,19 +101,16 @@ prof_init(void)
/* Allocate and initialize one profiling buffer per CPU. */
CPU_INFO_FOREACH(cii, ci) {
ci->ci_gmonclock = clockintr_establish(ci, gmonclock, NULL);
if (ci->ci_gmonclock == NULL) {
printf("%s: clockintr_establish gmonclock\n", __func__);
return;
}
clockintr_stagger(ci->ci_gmonclock, profclock_period,
CPU_INFO_UNIT(ci), MAXCPUS);
cp = km_alloc(round_page(size), &kv_any, &kp_zero, &kd_nowait);
if (cp == NULL) {
printf("No memory for profiling.\n");
return;
}
clockintr_bind(&ci->ci_gmonclock, ci, gmonclock, NULL);
clockintr_stagger(&ci->ci_gmonclock, profclock_period,
CPU_INFO_UNIT(ci), MAXCPUS);
p = (struct gmonparam *)cp;
cp += sizeof(*p);
p->tos = (struct tostruct *)cp;
@ -159,7 +156,7 @@ prof_state_toggle(struct cpu_info *ci, int oldstate)
if (error == 0) {
if (++gmon_cpu_count == 1)
startprofclock(&process0);
clockintr_advance(ci->ci_gmonclock, profclock_period);
clockintr_advance(&ci->ci_gmonclock, profclock_period);
}
break;
default:
@ -167,7 +164,7 @@ prof_state_toggle(struct cpu_info *ci, int oldstate)
gp->state = GMON_PROF_OFF;
/* FALLTHROUGH */
case GMON_PROF_OFF:
clockintr_cancel(ci->ci_gmonclock);
clockintr_cancel(&ci->ci_gmonclock);
if (--gmon_cpu_count == 0)
stopprofclock(&process0);
#if !defined(GPROF)

8
sys/sys/clockintr.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: clockintr.h,v 1.24 2024/01/15 01:15:37 cheloha Exp $ */
/* $OpenBSD: clockintr.h,v 1.25 2024/01/24 19:23:38 cheloha Exp $ */
/*
* Copyright (c) 2020-2022 Scott Cheloha <cheloha@openbsd.org>
*
@ -102,7 +102,7 @@ struct clockintr_queue {
TAILQ_HEAD(, clockintr) cq_all; /* [m] established clockintr list */
TAILQ_HEAD(, clockintr) cq_pend;/* [m] pending clockintr list */
struct clockintr *cq_running; /* [m] running clockintr */
struct clockintr *cq_hardclock; /* [o] hardclock handle */
struct clockintr cq_hardclock; /* [o] hardclock handle */
struct intrclock cq_intrclock; /* [I] local interrupt clock */
struct clockintr_stat cq_stat; /* [o] dispatch statistics */
volatile uint32_t cq_gen; /* [o] cq_stat update generation */
@ -124,9 +124,9 @@ void clockintr_trigger(void);
*/
uint64_t clockintr_advance(struct clockintr *, uint64_t);
void clockintr_cancel(struct clockintr *);
struct clockintr *clockintr_establish(struct cpu_info *,
void clockintr_bind(struct clockintr *, struct cpu_info *,
void (*)(struct clockrequest *, void *, void *), void *);
void clockintr_cancel(struct clockintr *);
void clockintr_schedule(struct clockintr *, uint64_t);
void clockintr_stagger(struct clockintr *, uint64_t, uint32_t, uint32_t);
uint64_t clockrequest_advance(struct clockrequest *, uint64_t);

12
sys/sys/sched.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: sched.h,v 1.69 2024/01/14 17:23:56 cheloha Exp $ */
/* $OpenBSD: sched.h,v 1.70 2024/01/24 19:23:38 cheloha Exp $ */
/* $NetBSD: sched.h,v 1.2 1999/02/28 18:14:58 ross Exp $ */
/*-
@ -95,11 +95,11 @@ struct cpustats {
#ifdef _KERNEL
#include <sys/clockintr.h>
#include <sys/queue.h>
#define SCHED_NQS 32 /* 32 run queues. */
struct clockintr;
struct smr_entry;
/*
@ -115,10 +115,10 @@ struct schedstate_percpu {
u_int64_t spc_cp_time[CPUSTATES]; /* CPU state statistics */
u_char spc_curpriority; /* usrpri of curproc */
struct clockintr *spc_itimer; /* [o] itimer_update handle */
struct clockintr *spc_profclock; /* [o] profclock handle */
struct clockintr *spc_roundrobin; /* [o] roundrobin handle */
struct clockintr *spc_statclock; /* [o] statclock handle */
struct clockintr spc_itimer; /* [o] itimer_update handle */
struct clockintr spc_profclock; /* [o] profclock handle */
struct clockintr spc_roundrobin;/* [o] roundrobin handle */
struct clockintr spc_statclock; /* [o] statclock handle */
u_int spc_nrun; /* procs on the run queues */