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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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11
kernel/hung_task.c
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@@ -203,6 +203,14 @@ int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
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
*/
@@ -216,6 +224,9 @@ static int watchdog(void *dummy)
while (schedule_timeout_interruptible(timeout_jiffies(timeout)))
timeout = sysctl_hung_task_timeout_secs;
if (atomic_xchg(&reset_hung_task, 0))
continue;
check_hung_uninterruptible_tasks(timeout);
}