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| author | Marcelo Tosatti <mtosatti@redhat.com> | 2013-10-11 21:39:26 -0300 |
|---|---|---|
| committer | Gleb Natapov <gleb@redhat.com> | 2013-11-06 09:49:02 +0200 |
| commit | 8b414521bc5375ae8ba18c083af95d44b8da0d04 (patch) | |
| tree | dd45ba45e6c397081c838b4dd80e42bc3752ad4f /kernel/hung_task.c | |
| parent | d63285e94af3ade4fa8b10b0d9a22bcf72baf2f9 (diff) | |
| download | linux-8b414521bc5375ae8ba18c083af95d44b8da0d04.tar.bz2 | |
hung_task: add method to reset detector
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>
Diffstat (limited to 'kernel/hung_task.c')
| -rw-r--r-- | kernel/hung_task.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/hung_task.c b/kernel/hung_task.c index 3e97fb126e6b..dfdf51534b3e 100644 --- a/kernel/hung_task.c +++ b/kernel/hung_task.c @@ -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); } |