perf_counter: add an event_list
I noticed that the counter_list only includes top-level counters, thus
perf_swcounter_event() will miss sw-counters in groups.
Since perf_swcounter_event() also wants an RCU safe list, create a new
event_list that includes all counters and uses RCU list ops and use call_rcu
to free the counter structure.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index dfb4c7c..08c11a6 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -187,6 +187,7 @@
struct perf_counter {
#ifdef CONFIG_PERF_COUNTERS
struct list_head list_entry;
+ struct list_head event_entry;
struct list_head sibling_list;
struct perf_counter *group_leader;
const struct hw_perf_counter_ops *hw_ops;
@@ -220,6 +221,8 @@
struct perf_data *irqdata;
struct perf_data *usrdata;
struct perf_data data[2];
+
+ struct rcu_head rcu_head;
#endif
};
@@ -243,6 +246,7 @@
struct mutex mutex;
struct list_head counter_list;
+ struct list_head event_list;
int nr_counters;
int nr_active;
int is_active;