4 files changed, 58 insertions, 16 deletions

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 6cd8c0ee4b6f..eae6548efbf0 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -263,7 +263,18 @@ static inline void ftrace_kill(void) { }
 #endif /* CONFIG_FUNCTION_TRACER */
 
 #ifdef CONFIG_STACK_TRACER
+
+#define STACK_TRACE_ENTRIES 500
+
+struct stack_trace;
+
+extern unsigned stack_trace_index[];
+extern struct stack_trace stack_trace_max;
+extern unsigned long stack_trace_max_size;
+extern arch_spinlock_t stack_trace_max_lock;
+
 extern int stack_tracer_enabled;
+void stack_trace_print(void);
 int
 stack_trace_sysctl(struct ctl_table *table, int write,
                    void __user *buffer, size_t *lenp,
diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
index e2c13cd863bd..4acc552e9279 100644
--- a/include/linux/ring_buffer.h
+++ b/include/linux/ring_buffer.h
@@ -154,8 +154,8 @@ ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
 }
 #endif
 
-int ring_buffer_empty(struct ring_buffer *buffer);
-int ring_buffer_empty_cpu(struct ring_buffer *buffer, int cpu);
+bool ring_buffer_empty(struct ring_buffer *buffer);
+bool ring_buffer_empty_cpu(struct ring_buffer *buffer, int cpu);
 
 void ring_buffer_record_disable(struct ring_buffer *buffer);
 void ring_buffer_record_enable(struct ring_buffer *buffer);
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index ed27917cabc9..429fdfc3baf5 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -168,13 +168,12 @@ struct ring_buffer_event *
 trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer,
                                   int type, unsigned long len,
                                   unsigned long flags, int pc);
-void trace_current_buffer_unlock_commit(struct ring_buffer *buffer,
-                                        struct ring_buffer_event *event,
-                                        unsigned long flags, int pc);
-void trace_buffer_unlock_commit(struct ring_buffer *buffer,
+void trace_buffer_unlock_commit(struct trace_array *tr,
+                                struct ring_buffer *buffer,
                                 struct ring_buffer_event *event,
                                 unsigned long flags, int pc);
-void trace_buffer_unlock_commit_regs(struct ring_buffer *buffer,
+void trace_buffer_unlock_commit_regs(struct trace_array *tr,
+                                     struct ring_buffer *buffer,
                                      struct ring_buffer_event *event,
                                      unsigned long flags, int pc,
                                      struct pt_regs *regs);
@@ -329,6 +328,7 @@ enum {
         EVENT_FILE_FL_SOFT_DISABLED_BIT,
         EVENT_FILE_FL_TRIGGER_MODE_BIT,
         EVENT_FILE_FL_TRIGGER_COND_BIT,
+        EVENT_FILE_FL_PID_FILTER_BIT,
 };
 
 /*
@@ -342,6 +342,7 @@ enum {
  *                   tracepoint may be enabled)
  *  TRIGGER_MODE  - When set, invoke the triggers associated with the event
  *  TRIGGER_COND  - When set, one or more triggers has an associated filter
+ *  PID_FILTER    - When set, the event is filtered based on pid
  */
 enum {
         EVENT_FILE_FL_ENABLED           = (1 << EVENT_FILE_FL_ENABLED_BIT),
@@ -352,6 +353,7 @@ enum {
         EVENT_FILE_FL_SOFT_DISABLED     = (1 << EVENT_FILE_FL_SOFT_DISABLED_BIT),
         EVENT_FILE_FL_TRIGGER_MODE      = (1 << EVENT_FILE_FL_TRIGGER_MODE_BIT),
         EVENT_FILE_FL_TRIGGER_COND      = (1 << EVENT_FILE_FL_TRIGGER_COND_BIT),
+        EVENT_FILE_FL_PID_FILTER        = (1 << EVENT_FILE_FL_PID_FILTER_BIT),
 };
 
 struct trace_event_file {
@@ -430,6 +432,8 @@ extern enum event_trigger_type event_triggers_call(struct trace_event_file *file
 extern void event_triggers_post_call(struct trace_event_file *file,
                                      enum event_trigger_type tt);
 
+bool trace_event_ignore_this_pid(struct trace_event_file *trace_file);
+
 /**
  * trace_trigger_soft_disabled - do triggers and test if soft disabled
  * @file: The file pointer of the event to test
@@ -449,6 +453,8 @@ trace_trigger_soft_disabled(struct trace_event_file *file)
                         event_triggers_call(file, NULL);
                 if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
                         return true;
+                if (eflags & EVENT_FILE_FL_PID_FILTER)
+                        return trace_event_ignore_this_pid(file);
         }
         return false;
 }
@@ -508,7 +514,7 @@ event_trigger_unlock_commit(struct trace_event_file *file,
         enum event_trigger_type tt = ETT_NONE;
 
         if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
-                trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
+                trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);
 
         if (tt)
                 event_triggers_post_call(file, tt);
@@ -540,7 +546,7 @@ event_trigger_unlock_commit_regs(struct trace_event_file *file,
         enum event_trigger_type tt = ETT_NONE;
 
         if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
-                trace_buffer_unlock_commit_regs(buffer, event,
+                trace_buffer_unlock_commit_regs(file->tr, buffer, event,
                                                 irq_flags, pc, regs);
 
         if (tt)
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index a5f7f3ecafa3..696a339c592c 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -26,6 +26,7 @@ struct notifier_block;
 struct tracepoint_func {
         void *func;
         void *data;
+        int prio;
 };
 
 struct tracepoint {
@@ -42,9 +43,14 @@ struct trace_enum_map {
         unsigned long           enum_value;
 };
 
+#define TRACEPOINT_DEFAULT_PRIO 10
+
 extern int
 tracepoint_probe_register(struct tracepoint *tp, void *probe, void *data);
 extern int
+tracepoint_probe_register_prio(struct tracepoint *tp, void *probe, void *data,
+                               int prio);
+extern int
 tracepoint_probe_unregister(struct tracepoint *tp, void *probe, void *data);
 extern void
 for_each_kernel_tracepoint(void (*fct)(struct tracepoint *tp, void *priv),
@@ -111,7 +117,18 @@ extern void syscall_unregfunc(void);
 #define TP_ARGS(args...)        args
 #define TP_CONDITION(args...)   args
 
-#ifdef CONFIG_TRACEPOINTS
+/*
+ * Individual subsystem my have a separate configuration to
+ * enable their tracepoints. By default, this file will create
+ * the tracepoints if CONFIG_TRACEPOINT is defined. If a subsystem
+ * wants to be able to disable its tracepoints from being created
+ * it can define NOTRACE before including the tracepoint headers.
+ */
+#if defined(CONFIG_TRACEPOINTS) && !defined(NOTRACE)
+#define TRACEPOINTS_ENABLED
+#endif
+
+#ifdef TRACEPOINTS_ENABLED
 
 /*
  * it_func[0] is never NULL because there is at least one element in the array
@@ -167,10 +184,11 @@ extern void syscall_unregfunc(void);
  * structure. Force alignment to the same alignment as the section start.
  *
  * When lockdep is enabled, we make sure to always do the RCU portions of
- * the tracepoint code, regardless of whether tracing is on or we match the
- * condition.  This lets us find RCU issues triggered with tracepoints even
- * when this tracepoint is off.  This code has no purpose other than poking
- * RCU a bit.
+ * the tracepoint code, regardless of whether tracing is on. However,
+ * don't check if the condition is false, due to interaction with idle
+ * instrumentation. This lets us find RCU issues triggered with tracepoints
+ * even when this tracepoint is off. This code has no purpose other than
+ * poking RCU a bit.
  */
 #define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
         extern struct tracepoint __tracepoint_##name;                   \
@@ -196,6 +214,13 @@ extern void syscall_unregfunc(void);
                                                 (void *)probe, data);   \
         }                                                               \
         static inline int                                               \
+        register_trace_prio_##name(void (*probe)(data_proto), void *data,\
+                                   int prio)                            \
+        {                                                               \
+                return tracepoint_probe_register_prio(&__tracepoint_##name, \
+                                              (void *)probe, data, prio); \
+        }                                                               \
+        static inline int                                               \
         unregister_trace_##name(void (*probe)(data_proto), void *data)  \
         {                                                               \
                 return tracepoint_probe_unregister(&__tracepoint_##name,\
@@ -234,7 +259,7 @@ extern void syscall_unregfunc(void);
 #define EXPORT_TRACEPOINT_SYMBOL(name)                                  \
         EXPORT_SYMBOL(__tracepoint_##name)
 
-#else /* !CONFIG_TRACEPOINTS */
+#else /* !TRACEPOINTS_ENABLED */
 #define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
         static inline void trace_##name(proto)                          \
         { }                                                             \
@@ -266,7 +291,7 @@ extern void syscall_unregfunc(void);
 #define EXPORT_TRACEPOINT_SYMBOL_GPL(name)
 #define EXPORT_TRACEPOINT_SYMBOL(name)
 
-#endif /* CONFIG_TRACEPOINTS */
+#endif /* TRACEPOINTS_ENABLED */
 
 #ifdef CONFIG_TRACING
 /**