static unsigned long is_setup;
static DEFINE_MUTEX(start_mutex);
-#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
-
-static void switch_worker(struct work_struct *work);
-static DECLARE_DELAYED_WORK(switch_work, switch_worker);
-unsigned long timeout_jiffies;
-#define MULTIPLEXING_TIMER_DEFAULT 1
-
-#endif
-
/* timer
0 - use performance monitoring hardware if available
1 - use the timer int mechanism regardless
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
+static void switch_worker(struct work_struct *work);
+static DECLARE_DELAYED_WORK(switch_work, switch_worker);
+
static void start_switch_worker(void)
{
- schedule_delayed_work(&switch_work, timeout_jiffies);
+ if (oprofile_ops.switch_events)
+ schedule_delayed_work(&switch_work, oprofile_time_slice);
+}
+
+static void stop_switch_worker(void)
+{
+ cancel_delayed_work_sync(&switch_work);
}
static void switch_worker(struct work_struct *work)
{
- if (!oprofile_ops.switch_events())
- start_switch_worker();
+ if (oprofile_ops.switch_events())
+ return;
+
+ atomic_inc(&oprofile_stats.multiplex_counter);
+ start_switch_worker();
+}
+
+/* User inputs in ms, converts to jiffies */
+int oprofile_set_timeout(unsigned long val_msec)
+{
+ int err = 0;
+ unsigned long time_slice;
+
+ mutex_lock(&start_mutex);
+
+ if (oprofile_started) {
+ err = -EBUSY;
+ goto out;
+ }
+
+ if (!oprofile_ops.switch_events) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ time_slice = msecs_to_jiffies(val_msec);
+ if (time_slice == MAX_JIFFY_OFFSET) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ oprofile_time_slice = time_slice;
+
+out:
+ mutex_unlock(&start_mutex);
+ return err;
+
}
+#else
+
+static inline void start_switch_worker(void) { }
+static inline void stop_switch_worker(void) { }
+
#endif
/* Actually start profiling (echo 1>/dev/oprofile/enable) */
if ((err = oprofile_ops.start()))
goto out;
-#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
- if (oprofile_ops.switch_events)
- start_switch_worker();
-#endif
+ start_switch_worker();
oprofile_started = 1;
out:
oprofile_ops.stop();
oprofile_started = 0;
-#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
- cancel_delayed_work_sync(&switch_work);
-#endif
+ stop_switch_worker();
/* wake up the daemon to read what remains */
wake_up_buffer_waiter();
mutex_unlock(&start_mutex);
}
-#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
-
-/* User inputs in ms, converts to jiffies */
-int oprofile_set_timeout(unsigned long val_msec)
-{
- int err = 0;
- unsigned long time_slice;
-
- mutex_lock(&start_mutex);
-
- if (oprofile_started) {
- err = -EBUSY;
- goto out;
- }
-
- if (!oprofile_ops.switch_events) {
- err = -EINVAL;
- goto out;
- }
-
- time_slice = msecs_to_jiffies(val_msec);
- if (time_slice == MAX_JIFFY_OFFSET) {
- err = -EINVAL;
- goto out;
- }
-
- timeout_jiffies = time_slice;
-
-out:
- mutex_unlock(&start_mutex);
- return err;
-
-}
-
-#endif
-
int oprofile_set_backtrace(unsigned long val)
{
int err = 0;
return err;
}
-#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
-
-static void __init oprofile_multiplexing_init(void)
-{
- timeout_jiffies = msecs_to_jiffies(MULTIPLEXING_TIMER_DEFAULT);
-}
-
-#endif
-
static int __init oprofile_init(void)
{
int err;
-#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
- oprofile_multiplexing_init();
-#endif
-
err = oprofile_arch_init(&oprofile_ops);
if (err < 0 || timer) {