softlockup: add a /proc tuning parameter

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / softlockup.c

diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 72c2561ff5f8d7460c94263d10b4cec10705ea39..edeeef3a6a322917b5b2befb95238df5557a9af5 100644 (file)
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -24,6 +24,7 @@ static DEFINE_PER_CPU(unsigned long, print_timestamp);
 static DEFINE_PER_CPU(struct task_struct *, watchdog_task);
 
 static int did_panic;
+int softlockup_thresh = 10;
 
 static int
 softlock_panic(struct notifier_block *this, unsigned long event, void *ptr)
@@ -104,13 +105,15 @@ void softlockup_tick(void)
                wake_up_process(per_cpu(watchdog_task, this_cpu));
 
        /* Warn about unreasonable 10+ seconds delays: */
-       if (now <= (touch_timestamp + 10))
+       if (now <= (touch_timestamp + softlockup_thresh))
                return;
 
        per_cpu(print_timestamp, this_cpu) = touch_timestamp;
 
        spin_lock(&print_lock);
-       printk(KERN_ERR "BUG: soft lockup detected on CPU#%d!\n", this_cpu);
+       printk(KERN_ERR "BUG: soft lockup - CPU#%d stuck for %lus! [%s:%d]\n",
+                       this_cpu, now - touch_timestamp,
+                               current->comm, current->pid);
        if (regs)
                show_regs(regs);
        else