kernel/hung_task.c: break RCU locks based on jiffies

[uclinux-h8/linux.git] / kernel / hung_task.c

diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 85af0cd..4a91916 100644 (file)
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -34,7 +34,7 @@ int __read_mostly sysctl_hung_task_check_count = PID_MAX_LIMIT;
  * is disabled during the critical section. It also controls the size of
  * the RCU grace period. So it needs to be upper-bound.
  */
-#define HUNG_TASK_BATCHING 1024
+#define HUNG_TASK_LOCK_BREAK (HZ / 10)
 
 /*
  * Zero means infinite timeout - no checking done:
@@ -171,7 +171,7 @@ static bool rcu_lock_break(struct task_struct *g, struct task_struct *t)
 static void check_hung_uninterruptible_tasks(unsigned long timeout)
 {
        int max_count = sysctl_hung_task_check_count;
-       int batch_count = HUNG_TASK_BATCHING;
+       unsigned long last_break = jiffies;
        struct task_struct *g, *t;
 
        /*
@@ -186,10 +186,10 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout)
        for_each_process_thread(g, t) {
                if (!max_count--)
                        goto unlock;
-               if (!--batch_count) {
-                       batch_count = HUNG_TASK_BATCHING;
+               if (time_after(jiffies, last_break + HUNG_TASK_LOCK_BREAK)) {
                        if (!rcu_lock_break(g, t))
                                goto unlock;
+                       last_break = jiffies;
                }
                /* use "==" to skip the TASK_KILLABLE tasks waiting on NFS */
                if (t->state == TASK_UNINTERRUPTIBLE)