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dtrace_gethrtime_init: pin to master while examining other CPUs

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Also use pc_cpumask to be future-friendly.

Reviewed by:	jhb
MFC after:	2 weeks
This commit is contained in:
Andriy Gapon 2010-12-07 09:03:17 +00:00
parent 0e777d8457
commit 7becfa95b9
2 changed files with 10 additions and 8 deletions
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9
sys/cddl/dev/dtrace/amd64/dtrace_subr.c
View file

@ -405,6 +405,7 @@ dtrace_gethrtime_init_cpu(void *arg)
static void
dtrace_gethrtime_init(void *arg)
{
struct pcpu *pc;
uint64_t tsc_f;
cpumask_t map;
int i;
@ -437,15 +438,14 @@ dtrace_gethrtime_init(void *arg)
nsec_scale = ((uint64_t)NANOSEC << SCALE_SHIFT) / tsc_f;
/* The current CPU is the reference one. */
sched_pin();
tsc_skew[curcpu] = 0;
CPU_FOREACH(i) {
if (i == curcpu)
continue;
map = 0;
map |= (1 << curcpu);
map |= (1 << i);
pc = pcpu_find(i);
map = PCPU_GET(cpumask) | pc->pc_cpumask;
smp_rendezvous_cpus(map, dtrace_gethrtime_init_sync,
dtrace_gethrtime_init_cpu,
@ -453,6 +453,7 @@ dtrace_gethrtime_init(void *arg)
tsc_skew[i] = tgt_cpu_tsc - hst_cpu_tsc;
}
sched_unpin();
}
SYSINIT(dtrace_gethrtime_init, SI_SUB_SMP, SI_ORDER_ANY, dtrace_gethrtime_init, NULL);

9
sys/cddl/dev/dtrace/i386/dtrace_subr.c
View file

@ -405,6 +405,7 @@ dtrace_gethrtime_init_cpu(void *arg)
static void
dtrace_gethrtime_init(void *arg)
{
struct pcpu *pc;
uint64_t tsc_f;
cpumask_t map;
int i;
@ -437,15 +438,14 @@ dtrace_gethrtime_init(void *arg)
nsec_scale = ((uint64_t)NANOSEC << SCALE_SHIFT) / tsc_f;
/* The current CPU is the reference one. */
sched_pin();
tsc_skew[curcpu] = 0;
CPU_FOREACH(i) {
if (i == curcpu)
continue;
map = 0;
map |= (1 << curcpu);
map |= (1 << i);
pc = pcpu_find(i);
map = PCPU_GET(cpumask) | pc->pc_cpumask;
smp_rendezvous_cpus(map, dtrace_gethrtime_init_sync,
dtrace_gethrtime_init_cpu,
@ -453,6 +453,7 @@ dtrace_gethrtime_init(void *arg)
tsc_skew[i] = tgt_cpu_tsc - hst_cpu_tsc;
}
sched_unpin();
}
SYSINIT(dtrace_gethrtime_init, SI_SUB_SMP, SI_ORDER_ANY, dtrace_gethrtime_init, NULL);