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hung_task: add method to reset detector

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In certain occasions it is possible for a hung task detector
positive to be false: continuation from a paused VM, for example.

Add a method to reset detection, similar as is done
with other kernel watchdogs.

Acked-by: Don Zickus <dzickus@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Marcelo Tosatti 2013-10-11 21:39:26 -03:00 committed by Gleb Natapov
parent d63285e94a
commit 8b414521bc
3 changed files with 20 additions and 0 deletions
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1
arch/x86/kernel/pvclock.c
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@ -48,6 +48,7 @@ void pvclock_touch_watchdogs(void)
touch_softlockup_watchdog_sync(); touch_softlockup_watchdog_sync();
clocksource_touch_watchdog(); clocksource_touch_watchdog();
rcu_cpu_stall_reset(); rcu_cpu_stall_reset();
reset_hung_task_detector();
} }
static atomic64_t last_value = ATOMIC64_INIT(0); static atomic64_t last_value = ATOMIC64_INIT(0);

8
include/linux/sched.h
View file

@ -285,6 +285,14 @@ static inline void lockup_detector_init(void)
} }
#endif #endif
#ifdef CONFIG_DETECT_HUNG_TASK
void reset_hung_task_detector(void);
#else
static inline void reset_hung_task_detector(void)
{
}
#endif
/* Attach to any functions which should be ignored in wchan output. */ /* Attach to any functions which should be ignored in wchan output. */
#define __sched __attribute__((__section__(".sched.text"))) #define __sched __attribute__((__section__(".sched.text")))

11
kernel/hung_task.c
View file

@ -203,6 +203,14 @@ int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
return ret; return ret;
} }
static atomic_t reset_hung_task = ATOMIC_INIT(0);
void reset_hung_task_detector(void)
{
atomic_set(&reset_hung_task, 1);
}
EXPORT_SYMBOL_GPL(reset_hung_task_detector);
/* /*
* kthread which checks for tasks stuck in D state * kthread which checks for tasks stuck in D state
*/ */
@ -216,6 +224,9 @@ static int watchdog(void *dummy)
while (schedule_timeout_interruptible(timeout_jiffies(timeout))) while (schedule_timeout_interruptible(timeout_jiffies(timeout)))
timeout = sysctl_hung_task_timeout_secs; timeout = sysctl_hung_task_timeout_secs;
if (atomic_xchg(&reset_hung_task, 0))
continue;
check_hung_uninterruptible_tasks(timeout); check_hung_uninterruptible_tasks(timeout);
} }