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Add a tunable kern.smp.disabled for disabling explicitly smp on an smp

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kernel.
This commit is contained in:
jake 2002-12-28 23:21:13 +00:00
parent e053499669
commit e196fa06ab
1 changed files with 5 additions and 1 deletions
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6
sys/kern/subr_smp.c
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@ -62,6 +62,10 @@ SYSCTL_NODE(_kern, OID_AUTO, smp, CTLFLAG_RD, NULL, "Kernel SMP");
int smp_active = 0; /* are the APs allowed to run? */
SYSCTL_INT(_kern_smp, OID_AUTO, active, CTLFLAG_RW, &smp_active, 0, "");
int smp_disabled = 0; /* has smp been disabled? */
SYSCTL_INT(_kern_smp, OID_AUTO, disabled, CTLFLAG_RD, &smp_disabled, 0, "");
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, &smp_cpus, 0, "");
@ -102,7 +106,7 @@ mp_start(void *dummy)
{
/* Probe for MP hardware. */
if (mp_probe_status == 0)
if (mp_probe_status == 0 || smp_disabled != 0)
return;
mtx_init(&smp_rv_mtx, "smp rendezvous", NULL, MTX_SPIN);