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Code Issues Releases Activity

Always call sched_bind(), even if on the CPU in question. It is wrong to

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check if we're already on that cpu and skip the bind since the thread could
be migrated off in the meantime.

Suggested by:	jeff
Approved by:	re
This commit is contained in:
Nate Lawson 2007-08-20 06:28:26 +00:00
parent 2145b9d207
commit 62db376af3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=171898
1 changed files with 15 additions and 25 deletions
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40
sys/kern/kern_cpu.c
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@ -227,7 +227,7 @@ cf_set_method(device_t dev, const struct cf_level *level, int priority)
const struct cf_setting *set;
struct cf_saved_freq *saved_freq, *curr_freq;
struct pcpu *pc;
int cpu_id, error, i;
int error, i;
sc = device_get_softc(dev);
error = 0;
@ -294,22 +294,17 @@ cf_set_method(device_t dev, const struct cf_level *level, int priority)
goto out;
}
/* Bind to the target CPU before switching, if necessary. */
cpu_id = PCPU_GET(cpuid);
/* Bind to the target CPU before switching. */
pc = cpu_get_pcpu(set->dev);
if (cpu_id != pc->pc_cpuid) {
thread_lock(curthread);
sched_bind(curthread, pc->pc_cpuid);
thread_unlock(curthread);
}
thread_lock(curthread);
sched_bind(curthread, pc->pc_cpuid);
thread_unlock(curthread);
CF_DEBUG("setting abs freq %d on %s (cpu %d)\n", set->freq,
device_get_nameunit(set->dev), PCPU_GET(cpuid));
error = CPUFREQ_DRV_SET(set->dev, set);
if (cpu_id != pc->pc_cpuid) {
thread_lock(curthread);
sched_unbind(curthread);
thread_unlock(curthread);
}
thread_lock(curthread);
sched_unbind(curthread);
thread_unlock(curthread);
if (error) {
goto out;
}
@ -323,22 +318,17 @@ cf_set_method(device_t dev, const struct cf_level *level, int priority)
goto out;
}
/* Bind to the target CPU before switching, if necessary. */
cpu_id = PCPU_GET(cpuid);
/* Bind to the target CPU before switching. */
pc = cpu_get_pcpu(set->dev);
if (cpu_id != pc->pc_cpuid) {
thread_lock(curthread);
sched_bind(curthread, pc->pc_cpuid);
thread_unlock(curthread);
}
thread_lock(curthread);
sched_bind(curthread, pc->pc_cpuid);
thread_unlock(curthread);
CF_DEBUG("setting rel freq %d on %s (cpu %d)\n", set->freq,
device_get_nameunit(set->dev), PCPU_GET(cpuid));
error = CPUFREQ_DRV_SET(set->dev, set);
if (cpu_id != pc->pc_cpuid) {
thread_lock(curthread);
sched_unbind(curthread);
thread_unlock(curthread);
}
thread_lock(curthread);
sched_unbind(curthread);
thread_unlock(curthread);
if (error) {
/* XXX Back out any successful setting? */
goto out;