* to those contributors as well.
*/
+#define pr_fmt(fmt) "NMI watchdog: " fmt
+
#include <linux/mm.h>
#include <linux/cpu.h>
#include <linux/nmi.h>
*/
static int watchdog(void *unused)
{
- struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
+ struct sched_param param = { .sched_priority = 0 };
struct hrtimer *hrtimer = &__raw_get_cpu_var(watchdog_hrtimer);
- sched_setscheduler(current, SCHED_FIFO, ¶m);
-
/* initialize timestamp */
__touch_watchdog();
set_current_state(TASK_INTERRUPTIBLE);
}
+ /*
+ * Drop the policy/priority elevation during thread exit to avoid a
+ * scheduling latency spike.
+ */
__set_current_state(TASK_RUNNING);
- param.sched_priority = 0;
sched_setscheduler(current, SCHED_NORMAL, ¶m);
return 0;
}
/* Try to register using hardware perf events */
event = perf_event_create_kernel_counter(wd_attr, cpu, NULL, watchdog_overflow_callback, NULL);
if (!IS_ERR(event)) {
- printk(KERN_INFO "NMI watchdog enabled, takes one hw-pmu counter.\n");
+ pr_info("enabled, takes one hw-pmu counter.\n");
goto out_save;
}
/* vary the KERN level based on the returned errno */
if (PTR_ERR(event) == -EOPNOTSUPP)
- printk(KERN_INFO "NMI watchdog disabled (cpu%i): not supported (no LAPIC?)\n", cpu);
+ pr_info("disabled (cpu%i): not supported (no LAPIC?)\n", cpu);
else if (PTR_ERR(event) == -ENOENT)
- printk(KERN_WARNING "NMI watchdog disabled (cpu%i): hardware events not enabled\n", cpu);
+ pr_warning("disabled (cpu%i): hardware events not enabled\n",
+ cpu);
else
- printk(KERN_ERR "NMI watchdog disabled (cpu%i): unable to create perf event: %ld\n", cpu, PTR_ERR(event));
+ pr_err("disabled (cpu%i): unable to create perf event: %ld\n",
+ cpu, PTR_ERR(event));
return PTR_ERR(event);
/* success path */
/* create the watchdog thread */
if (!p) {
+ struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
p = kthread_create_on_node(watchdog, NULL, cpu_to_node(cpu), "watchdog/%d", cpu);
if (IS_ERR(p)) {
- printk(KERN_ERR "softlockup watchdog for %i failed\n", cpu);
+ pr_err("softlockup watchdog for %i failed\n", cpu);
if (!err) {
/* if hardlockup hasn't already set this */
err = PTR_ERR(p);
}
goto out;
}
+ sched_setscheduler(p, SCHED_FIFO, ¶m);
kthread_bind(p, cpu);
per_cpu(watchdog_touch_ts, cpu) = 0;
per_cpu(softlockup_watchdog, cpu) = p;
watchdog_enabled = 1;
if (!watchdog_enabled)
- printk(KERN_ERR "watchdog: failed to be enabled on some cpus\n");
+ pr_err("failed to be enabled on some cpus\n");
}