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-rw-r--r--kernel/hung_task.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index e0f90c2b57aa..d234022805dc 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -185,10 +185,12 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout)
rcu_read_unlock();
}
-static unsigned long timeout_jiffies(unsigned long timeout)
+static long hung_timeout_jiffies(unsigned long last_checked,
+ unsigned long timeout)
{
/* timeout of 0 will disable the watchdog */
- return timeout ? timeout * HZ : MAX_SCHEDULE_TIMEOUT;
+ return timeout ? last_checked - jiffies + timeout * HZ :
+ MAX_SCHEDULE_TIMEOUT;
}
/*
@@ -224,18 +226,21 @@ EXPORT_SYMBOL_GPL(reset_hung_task_detector);
*/
static int watchdog(void *dummy)
{
+ unsigned long hung_last_checked = jiffies;
+
set_user_nice(current, 0);
for ( ; ; ) {
unsigned long timeout = sysctl_hung_task_timeout_secs;
+ long t = hung_timeout_jiffies(hung_last_checked, timeout);
- while (schedule_timeout_interruptible(timeout_jiffies(timeout)))
- timeout = sysctl_hung_task_timeout_secs;
-
- if (atomic_xchg(&reset_hung_task, 0))
+ if (t <= 0) {
+ if (!atomic_xchg(&reset_hung_task, 0))
+ check_hung_uninterruptible_tasks(timeout);
+ hung_last_checked = jiffies;
continue;
-
- check_hung_uninterruptible_tasks(timeout);
+ }
+ schedule_timeout_interruptible(t);
}
return 0;