diff options
Diffstat (limited to 'sys/kern/subr_smp.c')
| -rw-r--r-- | sys/kern/subr_smp.c | 786 |
1 files changed, 786 insertions, 0 deletions
diff --git a/sys/kern/subr_smp.c b/sys/kern/subr_smp.c new file mode 100644 index 0000000..3b27dce --- /dev/null +++ b/sys/kern/subr_smp.c @@ -0,0 +1,786 @@ +/*- + * Copyright (c) 2001, John Baldwin <jhb@FreeBSD.org>. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the author nor the names of any co-contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* + * This module holds the global variables and machine independent functions + * used for the kernel SMP support. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/ktr.h> +#include <sys/proc.h> +#include <sys/bus.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#include <sys/pcpu.h> +#include <sys/sched.h> +#include <sys/smp.h> +#include <sys/sysctl.h> + +#include <machine/cpu.h> +#include <machine/smp.h> + +#include "opt_sched.h" + +#ifdef SMP +volatile cpuset_t stopped_cpus; +volatile cpuset_t started_cpus; +volatile cpuset_t suspended_cpus; +cpuset_t hlt_cpus_mask; +cpuset_t logical_cpus_mask; + +void (*cpustop_restartfunc)(void); +#endif +/* This is used in modules that need to work in both SMP and UP. */ +cpuset_t all_cpus; + +int mp_ncpus; +/* export this for libkvm consumers. */ +int mp_maxcpus = MAXCPU; + +volatile int smp_started; +u_int mp_maxid; + +static SYSCTL_NODE(_kern, OID_AUTO, smp, CTLFLAG_RD|CTLFLAG_CAPRD, NULL, + "Kernel SMP"); + +SYSCTL_INT(_kern_smp, OID_AUTO, maxid, CTLFLAG_RD|CTLFLAG_CAPRD, &mp_maxid, 0, + "Max CPU ID."); + +SYSCTL_INT(_kern_smp, OID_AUTO, maxcpus, CTLFLAG_RD|CTLFLAG_CAPRD, &mp_maxcpus, + 0, "Max number of CPUs that the system was compiled for."); + +int smp_active = 0; /* are the APs allowed to run? */ +SYSCTL_INT(_kern_smp, OID_AUTO, active, CTLFLAG_RW, &smp_active, 0, + "Number of Auxillary Processors (APs) that were successfully started"); + +int smp_disabled = 0; /* has smp been disabled? */ +SYSCTL_INT(_kern_smp, OID_AUTO, disabled, CTLFLAG_RDTUN|CTLFLAG_CAPRD, + &smp_disabled, 0, "SMP has been disabled from the loader"); +TUNABLE_INT("kern.smp.disabled", &smp_disabled); + +int smp_cpus = 1; /* how many cpu's running */ +SYSCTL_INT(_kern_smp, OID_AUTO, cpus, CTLFLAG_RD|CTLFLAG_CAPRD, &smp_cpus, 0, + "Number of CPUs online"); + +int smp_topology = 0; /* Which topology we're using. */ +SYSCTL_INT(_kern_smp, OID_AUTO, topology, CTLFLAG_RD, &smp_topology, 0, + "Topology override setting; 0 is default provided by hardware."); +TUNABLE_INT("kern.smp.topology", &smp_topology); + +#ifdef SMP +/* Enable forwarding of a signal to a process running on a different CPU */ +static int forward_signal_enabled = 1; +SYSCTL_INT(_kern_smp, OID_AUTO, forward_signal_enabled, CTLFLAG_RW, + &forward_signal_enabled, 0, + "Forwarding of a signal to a process on a different CPU"); + +/* Variables needed for SMP rendezvous. */ +static volatile int smp_rv_ncpus; +static void (*volatile smp_rv_setup_func)(void *arg); +static void (*volatile smp_rv_action_func)(void *arg); +static void (*volatile smp_rv_teardown_func)(void *arg); +static void *volatile smp_rv_func_arg; +static volatile int smp_rv_waiters[4]; + +/* + * Shared mutex to restrict busywaits between smp_rendezvous() and + * smp(_targeted)_tlb_shootdown(). A deadlock occurs if both of these + * functions trigger at once and cause multiple CPUs to busywait with + * interrupts disabled. + */ +struct mtx smp_ipi_mtx; + +/* + * Let the MD SMP code initialize mp_maxid very early if it can. + */ +static void +mp_setmaxid(void *dummy) +{ + cpu_mp_setmaxid(); +} +SYSINIT(cpu_mp_setmaxid, SI_SUB_TUNABLES, SI_ORDER_FIRST, mp_setmaxid, NULL); + +/* + * Call the MD SMP initialization code. + */ +static void +mp_start(void *dummy) +{ + + mtx_init(&smp_ipi_mtx, "smp rendezvous", NULL, MTX_SPIN); + + /* Probe for MP hardware. */ + if (smp_disabled != 0 || cpu_mp_probe() == 0) { + mp_ncpus = 1; + CPU_SETOF(PCPU_GET(cpuid), &all_cpus); + return; + } + + cpu_mp_start(); + printf("FreeBSD/SMP: Multiprocessor System Detected: %d CPUs\n", + mp_ncpus); + cpu_mp_announce(); +} +SYSINIT(cpu_mp, SI_SUB_CPU, SI_ORDER_THIRD, mp_start, NULL); + +void +forward_signal(struct thread *td) +{ + int id; + + /* + * signotify() has already set TDF_ASTPENDING and TDF_NEEDSIGCHECK on + * this thread, so all we need to do is poke it if it is currently + * executing so that it executes ast(). + */ + THREAD_LOCK_ASSERT(td, MA_OWNED); + KASSERT(TD_IS_RUNNING(td), + ("forward_signal: thread is not TDS_RUNNING")); + + CTR1(KTR_SMP, "forward_signal(%p)", td->td_proc); + + if (!smp_started || cold || panicstr) + return; + if (!forward_signal_enabled) + return; + + /* No need to IPI ourself. */ + if (td == curthread) + return; + + id = td->td_oncpu; + if (id == NOCPU) + return; + ipi_cpu(id, IPI_AST); +} + +/* + * When called the executing CPU will send an IPI to all other CPUs + * requesting that they halt execution. + * + * Usually (but not necessarily) called with 'other_cpus' as its arg. + * + * - Signals all CPUs in map to stop. + * - Waits for each to stop. + * + * Returns: + * -1: error + * 0: NA + * 1: ok + * + */ +static int +generic_stop_cpus(cpuset_t map, u_int type) +{ +#ifdef KTR + char cpusetbuf[CPUSETBUFSIZ]; +#endif + static volatile u_int stopping_cpu = NOCPU; + int i; + volatile cpuset_t *cpus; + + KASSERT( +#if defined(__amd64__) || defined(__i386__) + type == IPI_STOP || type == IPI_STOP_HARD || type == IPI_SUSPEND, +#else + type == IPI_STOP || type == IPI_STOP_HARD, +#endif + ("%s: invalid stop type", __func__)); + + if (!smp_started) + return (0); + + CTR2(KTR_SMP, "stop_cpus(%s) with %u type", + cpusetobj_strprint(cpusetbuf, &map), type); + + if (stopping_cpu != PCPU_GET(cpuid)) + while (atomic_cmpset_int(&stopping_cpu, NOCPU, + PCPU_GET(cpuid)) == 0) + while (stopping_cpu != NOCPU) + cpu_spinwait(); /* spin */ + + /* send the stop IPI to all CPUs in map */ + ipi_selected(map, type); + +#if defined(__amd64__) || defined(__i386__) + if (type == IPI_SUSPEND) + cpus = &suspended_cpus; + else +#endif + cpus = &stopped_cpus; + + i = 0; + while (!CPU_SUBSET(cpus, &map)) { + /* spin */ + cpu_spinwait(); + i++; + if (i == 100000000) { + printf("timeout stopping cpus\n"); + break; + } + } + + stopping_cpu = NOCPU; + return (1); +} + +int +stop_cpus(cpuset_t map) +{ + + return (generic_stop_cpus(map, IPI_STOP)); +} + +int +stop_cpus_hard(cpuset_t map) +{ + + return (generic_stop_cpus(map, IPI_STOP_HARD)); +} + +#if defined(__amd64__) || defined(__i386__) +int +suspend_cpus(cpuset_t map) +{ + + return (generic_stop_cpus(map, IPI_SUSPEND)); +} +#endif + +/* + * Called by a CPU to restart stopped CPUs. + * + * Usually (but not necessarily) called with 'stopped_cpus' as its arg. + * + * - Signals all CPUs in map to restart. + * - Waits for each to restart. + * + * Returns: + * -1: error + * 0: NA + * 1: ok + */ +int +restart_cpus(cpuset_t map) +{ +#ifdef KTR + char cpusetbuf[CPUSETBUFSIZ]; +#endif + + if (!smp_started) + return 0; + + CTR1(KTR_SMP, "restart_cpus(%s)", cpusetobj_strprint(cpusetbuf, &map)); + + /* signal other cpus to restart */ + CPU_COPY_STORE_REL(&map, &started_cpus); + + /* wait for each to clear its bit */ + while (CPU_OVERLAP(&stopped_cpus, &map)) + cpu_spinwait(); + + return 1; +} + +/* + * All-CPU rendezvous. CPUs are signalled, all execute the setup function + * (if specified), rendezvous, execute the action function (if specified), + * rendezvous again, execute the teardown function (if specified), and then + * resume. + * + * Note that the supplied external functions _must_ be reentrant and aware + * that they are running in parallel and in an unknown lock context. + */ +void +smp_rendezvous_action(void) +{ + struct thread *td; + void *local_func_arg; + void (*local_setup_func)(void*); + void (*local_action_func)(void*); + void (*local_teardown_func)(void*); +#ifdef INVARIANTS + int owepreempt; +#endif + + /* Ensure we have up-to-date values. */ + atomic_add_acq_int(&smp_rv_waiters[0], 1); + while (smp_rv_waiters[0] < smp_rv_ncpus) + cpu_spinwait(); + + /* Fetch rendezvous parameters after acquire barrier. */ + local_func_arg = smp_rv_func_arg; + local_setup_func = smp_rv_setup_func; + local_action_func = smp_rv_action_func; + local_teardown_func = smp_rv_teardown_func; + + /* + * Use a nested critical section to prevent any preemptions + * from occurring during a rendezvous action routine. + * Specifically, if a rendezvous handler is invoked via an IPI + * and the interrupted thread was in the critical_exit() + * function after setting td_critnest to 0 but before + * performing a deferred preemption, this routine can be + * invoked with td_critnest set to 0 and td_owepreempt true. + * In that case, a critical_exit() during the rendezvous + * action would trigger a preemption which is not permitted in + * a rendezvous action. To fix this, wrap all of the + * rendezvous action handlers in a critical section. We + * cannot use a regular critical section however as having + * critical_exit() preempt from this routine would also be + * problematic (the preemption must not occur before the IPI + * has been acknowledged via an EOI). Instead, we + * intentionally ignore td_owepreempt when leaving the + * critical section. This should be harmless because we do + * not permit rendezvous action routines to schedule threads, + * and thus td_owepreempt should never transition from 0 to 1 + * during this routine. + */ + td = curthread; + td->td_critnest++; +#ifdef INVARIANTS + owepreempt = td->td_owepreempt; +#endif + + /* + * If requested, run a setup function before the main action + * function. Ensure all CPUs have completed the setup + * function before moving on to the action function. + */ + if (local_setup_func != smp_no_rendevous_barrier) { + if (smp_rv_setup_func != NULL) + smp_rv_setup_func(smp_rv_func_arg); + atomic_add_int(&smp_rv_waiters[1], 1); + while (smp_rv_waiters[1] < smp_rv_ncpus) + cpu_spinwait(); + } + + if (local_action_func != NULL) + local_action_func(local_func_arg); + + if (local_teardown_func != smp_no_rendevous_barrier) { + /* + * Signal that the main action has been completed. If a + * full exit rendezvous is requested, then all CPUs will + * wait here until all CPUs have finished the main action. + */ + atomic_add_int(&smp_rv_waiters[2], 1); + while (smp_rv_waiters[2] < smp_rv_ncpus) + cpu_spinwait(); + + if (local_teardown_func != NULL) + local_teardown_func(local_func_arg); + } + + /* + * Signal that the rendezvous is fully completed by this CPU. + * This means that no member of smp_rv_* pseudo-structure will be + * accessed by this target CPU after this point; in particular, + * memory pointed by smp_rv_func_arg. + */ + atomic_add_int(&smp_rv_waiters[3], 1); + + td->td_critnest--; + KASSERT(owepreempt == td->td_owepreempt, + ("rendezvous action changed td_owepreempt")); +} + +void +smp_rendezvous_cpus(cpuset_t map, + void (* setup_func)(void *), + void (* action_func)(void *), + void (* teardown_func)(void *), + void *arg) +{ + int curcpumap, i, ncpus = 0; + + /* Look comments in the !SMP case. */ + if (!smp_started) { + spinlock_enter(); + if (setup_func != NULL) + setup_func(arg); + if (action_func != NULL) + action_func(arg); + if (teardown_func != NULL) + teardown_func(arg); + spinlock_exit(); + return; + } + + CPU_FOREACH(i) { + if (CPU_ISSET(i, &map)) + ncpus++; + } + if (ncpus == 0) + panic("ncpus is 0 with non-zero map"); + + mtx_lock_spin(&smp_ipi_mtx); + + /* Pass rendezvous parameters via global variables. */ + smp_rv_ncpus = ncpus; + smp_rv_setup_func = setup_func; + smp_rv_action_func = action_func; + smp_rv_teardown_func = teardown_func; + smp_rv_func_arg = arg; + smp_rv_waiters[1] = 0; + smp_rv_waiters[2] = 0; + smp_rv_waiters[3] = 0; + atomic_store_rel_int(&smp_rv_waiters[0], 0); + + /* + * Signal other processors, which will enter the IPI with + * interrupts off. + */ + curcpumap = CPU_ISSET(curcpu, &map); + CPU_CLR(curcpu, &map); + ipi_selected(map, IPI_RENDEZVOUS); + + /* Check if the current CPU is in the map */ + if (curcpumap != 0) + smp_rendezvous_action(); + + /* + * Ensure that the master CPU waits for all the other + * CPUs to finish the rendezvous, so that smp_rv_* + * pseudo-structure and the arg are guaranteed to not + * be in use. + */ + while (atomic_load_acq_int(&smp_rv_waiters[3]) < ncpus) + cpu_spinwait(); + + mtx_unlock_spin(&smp_ipi_mtx); +} + +void +smp_rendezvous(void (* setup_func)(void *), + void (* action_func)(void *), + void (* teardown_func)(void *), + void *arg) +{ + smp_rendezvous_cpus(all_cpus, setup_func, action_func, teardown_func, arg); +} + +static struct cpu_group group[MAXCPU]; + +struct cpu_group * +smp_topo(void) +{ + char cpusetbuf[CPUSETBUFSIZ], cpusetbuf2[CPUSETBUFSIZ]; + struct cpu_group *top; + + /* + * Check for a fake topology request for debugging purposes. + */ + switch (smp_topology) { + case 1: + /* Dual core with no sharing. */ + top = smp_topo_1level(CG_SHARE_NONE, 2, 0); + break; + case 2: + /* No topology, all cpus are equal. */ + top = smp_topo_none(); + break; + case 3: + /* Dual core with shared L2. */ + top = smp_topo_1level(CG_SHARE_L2, 2, 0); + break; + case 4: + /* quad core, shared l3 among each package, private l2. */ + top = smp_topo_1level(CG_SHARE_L3, 4, 0); + break; + case 5: + /* quad core, 2 dualcore parts on each package share l2. */ + top = smp_topo_2level(CG_SHARE_NONE, 2, CG_SHARE_L2, 2, 0); + break; + case 6: + /* Single-core 2xHTT */ + top = smp_topo_1level(CG_SHARE_L1, 2, CG_FLAG_HTT); + break; + case 7: + /* quad core with a shared l3, 8 threads sharing L2. */ + top = smp_topo_2level(CG_SHARE_L3, 4, CG_SHARE_L2, 8, + CG_FLAG_SMT); + break; + default: + /* Default, ask the system what it wants. */ + top = cpu_topo(); + break; + } + /* + * Verify the returned topology. + */ + if (top->cg_count != mp_ncpus) + panic("Built bad topology at %p. CPU count %d != %d", + top, top->cg_count, mp_ncpus); + if (CPU_CMP(&top->cg_mask, &all_cpus)) + panic("Built bad topology at %p. CPU mask (%s) != (%s)", + top, cpusetobj_strprint(cpusetbuf, &top->cg_mask), + cpusetobj_strprint(cpusetbuf2, &all_cpus)); + return (top); +} + +struct cpu_group * +smp_topo_none(void) +{ + struct cpu_group *top; + + top = &group[0]; + top->cg_parent = NULL; + top->cg_child = NULL; + top->cg_mask = all_cpus; + top->cg_count = mp_ncpus; + top->cg_children = 0; + top->cg_level = CG_SHARE_NONE; + top->cg_flags = 0; + + return (top); +} + +static int +smp_topo_addleaf(struct cpu_group *parent, struct cpu_group *child, int share, + int count, int flags, int start) +{ + char cpusetbuf[CPUSETBUFSIZ], cpusetbuf2[CPUSETBUFSIZ]; + cpuset_t mask; + int i; + + CPU_ZERO(&mask); + for (i = 0; i < count; i++, start++) + CPU_SET(start, &mask); + child->cg_parent = parent; + child->cg_child = NULL; + child->cg_children = 0; + child->cg_level = share; + child->cg_count = count; + child->cg_flags = flags; + child->cg_mask = mask; + parent->cg_children++; + for (; parent != NULL; parent = parent->cg_parent) { + if (CPU_OVERLAP(&parent->cg_mask, &child->cg_mask)) + panic("Duplicate children in %p. mask (%s) child (%s)", + parent, + cpusetobj_strprint(cpusetbuf, &parent->cg_mask), + cpusetobj_strprint(cpusetbuf2, &child->cg_mask)); + CPU_OR(&parent->cg_mask, &child->cg_mask); + parent->cg_count += child->cg_count; + } + + return (start); +} + +struct cpu_group * +smp_topo_1level(int share, int count, int flags) +{ + struct cpu_group *child; + struct cpu_group *top; + int packages; + int cpu; + int i; + + cpu = 0; + top = &group[0]; + packages = mp_ncpus / count; + top->cg_child = child = &group[1]; + top->cg_level = CG_SHARE_NONE; + for (i = 0; i < packages; i++, child++) + cpu = smp_topo_addleaf(top, child, share, count, flags, cpu); + return (top); +} + +struct cpu_group * +smp_topo_2level(int l2share, int l2count, int l1share, int l1count, + int l1flags) +{ + struct cpu_group *top; + struct cpu_group *l1g; + struct cpu_group *l2g; + int cpu; + int i; + int j; + + cpu = 0; + top = &group[0]; + l2g = &group[1]; + top->cg_child = l2g; + top->cg_level = CG_SHARE_NONE; + top->cg_children = mp_ncpus / (l2count * l1count); + l1g = l2g + top->cg_children; + for (i = 0; i < top->cg_children; i++, l2g++) { + l2g->cg_parent = top; + l2g->cg_child = l1g; + l2g->cg_level = l2share; + for (j = 0; j < l2count; j++, l1g++) + cpu = smp_topo_addleaf(l2g, l1g, l1share, l1count, + l1flags, cpu); + } + return (top); +} + + +struct cpu_group * +smp_topo_find(struct cpu_group *top, int cpu) +{ + struct cpu_group *cg; + cpuset_t mask; + int children; + int i; + + CPU_SETOF(cpu, &mask); + cg = top; + for (;;) { + if (!CPU_OVERLAP(&cg->cg_mask, &mask)) + return (NULL); + if (cg->cg_children == 0) + return (cg); + children = cg->cg_children; + for (i = 0, cg = cg->cg_child; i < children; cg++, i++) + if (CPU_OVERLAP(&cg->cg_mask, &mask)) + break; + } + return (NULL); +} +#else /* !SMP */ + +void +smp_rendezvous_cpus(cpuset_t map, + void (*setup_func)(void *), + void (*action_func)(void *), + void (*teardown_func)(void *), + void *arg) +{ + /* + * In the !SMP case we just need to ensure the same initial conditions + * as the SMP case. + */ + spinlock_enter(); + if (setup_func != NULL) + setup_func(arg); + if (action_func != NULL) + action_func(arg); + if (teardown_func != NULL) + teardown_func(arg); + spinlock_exit(); +} + +void +smp_rendezvous(void (*setup_func)(void *), + void (*action_func)(void *), + void (*teardown_func)(void *), + void *arg) +{ + + /* Look comments in the smp_rendezvous_cpus() case. */ + spinlock_enter(); + if (setup_func != NULL) + setup_func(arg); + if (action_func != NULL) + action_func(arg); + if (teardown_func != NULL) + teardown_func(arg); + spinlock_exit(); +} + +/* + * Provide dummy SMP support for UP kernels. Modules that need to use SMP + * APIs will still work using this dummy support. + */ +static void +mp_setvariables_for_up(void *dummy) +{ + mp_ncpus = 1; + mp_maxid = PCPU_GET(cpuid); + CPU_SETOF(mp_maxid, &all_cpus); + KASSERT(PCPU_GET(cpuid) == 0, ("UP must have a CPU ID of zero")); +} +SYSINIT(cpu_mp_setvariables, SI_SUB_TUNABLES, SI_ORDER_FIRST, + mp_setvariables_for_up, NULL); +#endif /* SMP */ + +void +smp_no_rendevous_barrier(void *dummy) +{ +#ifdef SMP + KASSERT((!smp_started),("smp_no_rendevous called and smp is started")); +#endif +} + +/* + * Wait specified idle threads to switch once. This ensures that even + * preempted threads have cycled through the switch function once, + * exiting their codepaths. This allows us to change global pointers + * with no other synchronization. + */ +int +quiesce_cpus(cpuset_t map, const char *wmesg, int prio) +{ + struct pcpu *pcpu; + u_int gen[MAXCPU]; + int error; + int cpu; + + error = 0; + for (cpu = 0; cpu <= mp_maxid; cpu++) { + if (!CPU_ISSET(cpu, &map) || CPU_ABSENT(cpu)) + continue; + pcpu = pcpu_find(cpu); + gen[cpu] = pcpu->pc_idlethread->td_generation; + } + for (cpu = 0; cpu <= mp_maxid; cpu++) { + if (!CPU_ISSET(cpu, &map) || CPU_ABSENT(cpu)) + continue; + pcpu = pcpu_find(cpu); + thread_lock(curthread); + sched_bind(curthread, cpu); + thread_unlock(curthread); + while (gen[cpu] == pcpu->pc_idlethread->td_generation) { + error = tsleep(quiesce_cpus, prio, wmesg, 1); + if (error) + goto out; + } + } +out: + thread_lock(curthread); + sched_unbind(curthread); + thread_unlock(curthread); + + return (error); +} + +int +quiesce_all_cpus(const char *wmesg, int prio) +{ + + return quiesce_cpus(all_cpus, wmesg, prio); +} |
