struct rcu_head rcu_head;
};
+/*
+ * Number of contexts where an event can trigger:
+ * task, softirq, hardirq, nmi.
+ */
+#define PERF_NR_CONTEXTS 4
+
/**
* struct perf_event_cpu_context - per cpu event context structure
*/
struct mutex hlist_mutex;
int hlist_refcount;
- /*
- * Recursion avoidance:
- *
- * task, softirq, irq, nmi context
- */
- int recursion[4];
+ /* Recursion avoidance in each contexts */
+ int recursion[PERF_NR_CONTEXTS];
};
struct perf_output_handle {
extern void perf_event_comm(struct task_struct *tsk);
extern void perf_event_fork(struct task_struct *tsk);
-extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
+/* Callchains */
+DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
+
+extern void perf_callchain_user(struct perf_callchain_entry *entry,
+ struct pt_regs *regs);
+extern void perf_callchain_kernel(struct perf_callchain_entry *entry,
+ struct pt_regs *regs);
+
+
+static inline void
+perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
+{
+ if (entry->nr < PERF_MAX_STACK_DEPTH)
+ entry->ip[entry->nr++] = ip;
+}
extern int sysctl_perf_event_paranoid;
extern int sysctl_perf_event_mlock;