*/
struct perf_event {
#ifdef CONFIG_PERF_EVENTS
- struct list_head group_entry;
+ /*
+ * entry onto perf_event_context::event_list;
+ * modifications require ctx->lock
+ * RCU safe iterations.
+ */
struct list_head event_entry;
+
+ /*
+ * XXX: group_entry and sibling_list should be mutually exclusive;
+ * either you're a sibling on a group, or you're the group leader.
+ * Rework the code to always use the same list element.
+ *
+ * Locked for modification by both ctx->mutex and ctx->lock; holding
+ * either sufficies for read.
+ */
+ struct list_head group_entry;
struct list_head sibling_list;
+
+ /*
+ * We need storage to track the entries in perf_pmu_migrate_context; we
+ * cannot use the event_entry because of RCU and we want to keep the
+ * group in tact which avoids us using the other two entries.
+ */
+ struct list_head migrate_entry;
+
struct hlist_node hlist_entry;
int nr_siblings;
int group_flags;
struct perf_regs_user regs_user;
u64 stack_user_size;
u64 weight;
+ /*
+ * Transaction flags for abort events:
+ */
+ u64 txn;
};
static inline void perf_sample_data_init(struct perf_sample_data *data,
data->stack_user_size = 0;
data->weight = 0;
data->data_src.val = 0;
+ data->txn = 0;
}
extern void perf_output_sample(struct perf_output_handle *handle,