diff options
Diffstat (limited to 'kernel/hung_task.c')
| -rw-r--r-- | kernel/hung_task.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/kernel/hung_task.c b/kernel/hung_task.c index 959d99583d1c..c18717189f32 100644 --- a/kernel/hung_task.c +++ b/kernel/hung_task.c @@ -31,6 +31,11 @@ static int __read_mostly sysctl_hung_task_check_count = PID_MAX_LIMIT; /* + * Total number of tasks detected as hung since boot: + */ +static unsigned long __read_mostly sysctl_hung_task_detect_count; + +/* * Limit number of tasks checked in a batch. * * This value controls the preemptibility of khungtaskd since preemption @@ -115,6 +120,12 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout) if (time_is_after_jiffies(t->last_switch_time + timeout * HZ)) return; + /* + * This counter tracks the total number of tasks detected as hung + * since boot. + */ + sysctl_hung_task_detect_count++; + trace_sched_process_hang(t); if (sysctl_hung_task_panic) { @@ -314,6 +325,13 @@ static struct ctl_table hung_task_sysctls[] = { .proc_handler = proc_dointvec_minmax, .extra1 = SYSCTL_NEG_ONE, }, + { + .procname = "hung_task_detect_count", + .data = &sysctl_hung_task_detect_count, + .maxlen = sizeof(unsigned long), + .mode = 0444, + .proc_handler = proc_doulongvec_minmax, + }, }; static void __init hung_task_sysctl_init(void) |