Merge branch 'linus' into core/softlockup
[linux-2.6.git] / kernel / time / tick-sched.c
index 28abad6..942fc7c 100644 (file)
@@ -48,6 +48,13 @@ static void tick_do_update_jiffies64(ktime_t now)
        unsigned long ticks = 0;
        ktime_t delta;
 
+       /*
+        * Do a quick check without holding xtime_lock:
+        */
+       delta = ktime_sub(now, last_jiffies_update);
+       if (delta.tv64 < tick_period.tv64)
+               return;
+
        /* Reevalute with xtime_lock held */
        write_seqlock(&xtime_lock);
 
@@ -228,6 +235,7 @@ void tick_nohz_stop_sched_tick(void)
                               local_softirq_pending());
                        ratelimit++;
                }
+               goto end;
        }
 
        ts->idle_calls++;
@@ -276,6 +284,7 @@ void tick_nohz_stop_sched_tick(void)
                        ts->tick_stopped = 1;
                        ts->idle_jiffies = last_jiffies;
                        rcu_enter_nohz();
+                       sched_clock_tick_stop(cpu);
                }
 
                /*
@@ -375,6 +384,7 @@ void tick_nohz_restart_sched_tick(void)
        select_nohz_load_balancer(0);
        now = ktime_get();
        tick_do_update_jiffies64(now);
+       sched_clock_tick_start(cpu);
        cpu_clear(cpu, nohz_cpu_mask);
 
        /*