Merge branch 'tip/tracing/ftrace' of git://git.kernel.org/pub/scm/lin…

…ux/kernel/git/rostedt/linux-2.6-trace into tracing/ftrace

include/asm-generic/vmlinux.lds.h

@@ -61,6 +61,14 @@
 #define BRANCH_PROFILE()
 #endif
 
+#ifdef CONFIG_EVENT_TRACER
+#define FTRACE_EVENTS()	VMLINUX_SYMBOL(__start_ftrace_events) = .;	\
+			*(_ftrace_events)				\
+			VMLINUX_SYMBOL(__stop_ftrace_events) = .;
+#else
+#define FTRACE_EVENTS()
+#endif
+
 /* .data section */
 #define DATA_DATA							\
 	*(.data)							\
@@ -81,7 +89,8 @@
 	*(__tracepoints)						\
 	VMLINUX_SYMBOL(__stop___tracepoints) = .;			\
 	LIKELY_PROFILE()		       				\
-	BRANCH_PROFILE()
+	BRANCH_PROFILE()						\
+	FTRACE_EVENTS()
 
 #define RO_DATA(align)							\
 	. = ALIGN((align));						\

include/linux/tracepoint.h

@@ -153,4 +153,7 @@ static inline void tracepoint_synchronize_unregister(void)
 	synchronize_sched();
 }
 
+#define DEFINE_TRACE_FMT(name, proto, args, fmt)		\
+	DECLARE_TRACE(name, TPPROTO(proto), TPARGS(args))
+
 #endif

include/trace/sched.h

@@ -4,53 +4,6 @@
 #include <linux/sched.h>
 #include <linux/tracepoint.h>
 
-DECLARE_TRACE(sched_kthread_stop,
-	TPPROTO(struct task_struct *t),
-		TPARGS(t));
-
-DECLARE_TRACE(sched_kthread_stop_ret,
-	TPPROTO(int ret),
-		TPARGS(ret));
-
-DECLARE_TRACE(sched_wait_task,
-	TPPROTO(struct rq *rq, struct task_struct *p),
-		TPARGS(rq, p));
-
-DECLARE_TRACE(sched_wakeup,
-	TPPROTO(struct rq *rq, struct task_struct *p, int success),
-		TPARGS(rq, p, success));
-
-DECLARE_TRACE(sched_wakeup_new,
-	TPPROTO(struct rq *rq, struct task_struct *p, int success),
-		TPARGS(rq, p, success));
-
-DECLARE_TRACE(sched_switch,
-	TPPROTO(struct rq *rq, struct task_struct *prev,
-		struct task_struct *next),
-		TPARGS(rq, prev, next));
-
-DECLARE_TRACE(sched_migrate_task,
-	TPPROTO(struct task_struct *p, int orig_cpu, int dest_cpu),
-		TPARGS(p, orig_cpu, dest_cpu));
-
-DECLARE_TRACE(sched_process_free,
-	TPPROTO(struct task_struct *p),
-		TPARGS(p));
-
-DECLARE_TRACE(sched_process_exit,
-	TPPROTO(struct task_struct *p),
-		TPARGS(p));
-
-DECLARE_TRACE(sched_process_wait,
-	TPPROTO(struct pid *pid),
-		TPARGS(pid));
-
-DECLARE_TRACE(sched_process_fork,
-	TPPROTO(struct task_struct *parent, struct task_struct *child),
-		TPARGS(parent, child));
-
-DECLARE_TRACE(sched_signal_send,
-	TPPROTO(int sig, struct task_struct *p),
-		TPARGS(sig, p));
+#include <trace/sched_event_types.h>
 
 #endif

include/trace/sched_event_types.h

@@ -0,0 +1,72 @@
+
+/* use <trace/sched.h> instead */
+#ifndef DEFINE_TRACE_FMT
+# error Do not include this file directly.
+# error Unless you know what you are doing.
+#endif
+
+DEFINE_TRACE_FMT(sched_kthread_stop,
+	TPPROTO(struct task_struct *t),
+	TPARGS(t),
+	TPFMT("task %s:%d", t->comm, t->pid));
+
+DEFINE_TRACE_FMT(sched_kthread_stop_ret,
+	TPPROTO(int ret),
+	TPARGS(ret),
+	TPFMT("ret=%d", ret));
+
+DEFINE_TRACE_FMT(sched_wait_task,
+	TPPROTO(struct rq *rq, struct task_struct *p),
+	TPARGS(rq, p),
+	TPFMT("task %s:%d", p->comm, p->pid));
+
+DEFINE_TRACE_FMT(sched_wakeup,
+	TPPROTO(struct rq *rq, struct task_struct *p, int success),
+	TPARGS(rq, p, success),
+	TPFMT("task %s:%d %s",
+	      p->comm, p->pid, success?"succeeded":"failed"));
+
+DEFINE_TRACE_FMT(sched_wakeup_new,
+	TPPROTO(struct rq *rq, struct task_struct *p, int success),
+	TPARGS(rq, p, success),
+	TPFMT("task %s:%d",
+	      p->comm, p->pid, success?"succeeded":"failed"));
+
+DEFINE_TRACE_FMT(sched_switch,
+	TPPROTO(struct rq *rq, struct task_struct *prev,
+		struct task_struct *next),
+	TPARGS(rq, prev, next),
+	TPFMT("task %s:%d ==> %s:%d",
+	      prev->comm, prev->pid, next->comm, next->pid));
+
+DEFINE_TRACE_FMT(sched_migrate_task,
+	TPPROTO(struct task_struct *p, int orig_cpu, int dest_cpu),
+	TPARGS(p, orig_cpu, dest_cpu),
+	TPFMT("task %s:%d from: %d  to: %d",
+	      p->comm, p->pid, orig_cpu, dest_cpu));
+
+DEFINE_TRACE_FMT(sched_process_free,
+	TPPROTO(struct task_struct *p),
+	TPARGS(p),
+	TPFMT("task %s:%d", p->comm, p->pid));
+
+DEFINE_TRACE_FMT(sched_process_exit,
+	TPPROTO(struct task_struct *p),
+	TPARGS(p),
+	TPFMT("task %s:%d", p->comm, p->pid));
+
+DEFINE_TRACE_FMT(sched_process_wait,
+	TPPROTO(struct pid *pid),
+	TPARGS(pid),
+	TPFMT("pid %d", pid));
+
+DEFINE_TRACE_FMT(sched_process_fork,
+	TPPROTO(struct task_struct *parent, struct task_struct *child),
+	TPARGS(parent, child),
+	TPFMT("parent %s:%d  child %s:%d",
+	      parent->comm, parent->pid, child->comm, child->pid));
+
+DEFINE_TRACE_FMT(sched_signal_send,
+	TPPROTO(int sig, struct task_struct *p),
+	TPARGS(sig, p),
+	TPFMT("sig: %d   task %s:%d", sig, p->comm, p->pid));

kernel/trace/Kconfig

@@ -159,6 +159,15 @@ config CONTEXT_SWITCH_TRACER
 	  This tracer gets called from the context switch and records
 	  all switching of tasks.
 
+config EVENT_TRACER
+	bool "Trace various events in the kernel"
+	depends on DEBUG_KERNEL
+	select TRACING
+	help
+	  This tracer hooks to various trace points in the kernel
+	  allowing the user to pick and choose which trace point they
+	  want to trace.
+
 config BOOT_TRACER
 	bool "Trace boot initcalls"
 	depends on DEBUG_KERNEL

kernel/trace/Makefile

@@ -38,5 +38,7 @@ obj-$(CONFIG_POWER_TRACER) += trace_power.o
 obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
 obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
 obj-$(CONFIG_BLK_DEV_IO_TRACE)	+= blktrace.o
+obj-$(CONFIG_EVENT_TRACER) += trace_events.o
+obj-$(CONFIG_EVENT_TRACER) += events.o
 
 libftrace-y := ftrace.o

kernel/trace/events.c

@@ -0,0 +1,13 @@
+/*
+ * This is the place to register all trace points as events.
+ * Include the trace/<type>.h at the top.
+ * Include the trace/<type>_event_types.h at the bottom.
+ */
+
+/* trace/<type>.h here */
+#include <trace/sched.h>
+
+#include "trace_events.h"
+
+/* trace/<type>_event_types.h here */
+#include <trace/sched_event_types.h>

kernel/trace/trace_events.h

@@ -0,0 +1,55 @@
+#ifndef _LINUX_KERNEL_TRACE_EVENTS_H
+#define _LINUX_KERNEL_TRACE_EVENTS_H
+
+#include <linux/debugfs.h>
+#include <linux/ftrace.h>
+#include "trace.h"
+
+struct ftrace_event_call {
+	char		*name;
+	struct dentry	*dir;
+	int		enabled;
+	int		(*regfunc)(void);
+	void		(*unregfunc)(void);
+};
+
+
+#undef TPFMT
+#define TPFMT(fmt, args...)	fmt "\n", ##args
+
+#undef DEFINE_TRACE_FMT
+#define DEFINE_TRACE_FMT(call, proto, args, fmt)			\
+static void ftrace_event_##call(proto)					\
+{									\
+	event_trace_printk(_RET_IP_, "(" #call ") " fmt);		\
+}									\
+									\
+static int ftrace_reg_event_##call(void)				\
+{									\
+	int ret;							\
+									\
+	ret = register_trace_##call(ftrace_event_##call);		\
+	if (!ret)							\
+		pr_info("event trace: Could not activate trace point "	\
+			"probe to " #call);				\
+	return ret;							\
+}									\
+									\
+static void ftrace_unreg_event_##call(void)				\
+{									\
+	unregister_trace_##call(ftrace_event_##call);			\
+}									\
+									\
+static struct ftrace_event_call __used					\
+__attribute__((__aligned__(4)))						\
+__attribute__((section("_ftrace_events"))) event_##call = {		\
+	.name 			= #call,				\
+	.regfunc		= ftrace_reg_event_##call,		\
+	.unregfunc		= ftrace_unreg_event_##call,		\
+}
+
+void event_trace_printk(unsigned long ip, const char *fmt, ...);
+extern struct ftrace_event_call __start_ftrace_events[];
+extern struct ftrace_event_call __stop_ftrace_events[];
+
+#endif /* _LINUX_KERNEL_TRACE_EVENTS_H */