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Subject[PATCH 2/8] tracing: create automated trace defines
From: Steven Rostedt <srostedt@redhat.com>

This patch lowers the number of places a developer must modify to add
new tracepoints. The current method to add a new tracepoint
into an existing system is to write the trace point macro in the
trace header with one of the macros TRACE_EVENT, TRACE_FORMAT or
DECLARE_TRACE, then they must add the same named item into the C file
with the macro DEFINE_TRACE(name) and then add the trace point.

This change cuts out the needing to add the DEFINE_TRACE(name).
Every file that uses the tracepoint must still include the trace/<type>.h
file, but the one C file must also add a define before the including
of that file.

#define CREATE_TRACE_POINTS
#include <trace/mytrace.h>

This will cause the trace/mytrace.h file to also produce the C code
necessary to implement the trace point.

Note, if more than one trace/<type>.h is used to create the C code
it is best to list them all together.

#define CREATE_TRACE_POINTS
#include <trace/foo.h>
#include <trace/bar.h>
#include <trace/fido.h>

Thanks to Mathieu Desnoyers and Christoph Hellwig for coming up with
the cleaner solution of the define above the includes over my first
design to have the C code include a "special" header.

This patch converts sched, irq and lockdep and skb to use this new
method.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Zhao Lei <zhaolei@cn.fujitsu.com>
Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
include/trace/define_trace.h | 75 ++++++++++++++++++++++++++++++++++++++++++
include/trace/irq.h | 5 ++-
include/trace/kmem.h | 4 ++-
include/trace/lockdep.h | 3 ++
include/trace/sched.h | 3 ++
include/trace/skb.h | 3 ++
kernel/exit.c | 4 --
kernel/fork.c | 2 -
kernel/irq/handle.c | 7 ++--
kernel/kthread.c | 3 --
kernel/lockdep.c | 12 ++-----
kernel/sched.c | 10 ++----
kernel/signal.c | 2 -
kernel/softirq.c | 3 --
mm/util.c | 11 ++----
net/core/net-traces.c | 4 +-
16 files changed, 105 insertions(+), 46 deletions(-)
create mode 100644 include/trace/define_trace.h
diff --git a/include/trace/define_trace.h b/include/trace/define_trace.h
new file mode 100644
index 0000000..de9dc7d
--- /dev/null
+++ b/include/trace/define_trace.h
@@ -0,0 +1,75 @@
+/*
+ * Trace files that want to automate creationg of all tracepoints defined
+ * in their file should include this file. The following are macros that the
+ * trace file may define:
+ *
+ * TRACE_SYSTEM defines the system the tracepoint is for
+ *
+ * TRACE_INCLUDE_FILE if the file name is something other than TRACE_SYSTEM.h
+ * This macro may be defined to tell define_trace.h what file to include.
+ * Note, leave off the ".h".
+ *
+ * TRACE_INCLUDE_PATH if the path is something other than core kernel include/trace
+ * then this macro can define the path to use. Note, the path is relative to
+ * define_trace.h, not the file including it. Full path names for out of tree
+ * modules must be used.
+ */
+
+#ifdef CREATE_TRACE_POINTS
+
+/* Prevent recursion */
+#undef CREATE_TRACE_POINTS
+
+#include <linux/stringify.h>
+
+#undef TRACE_EVENT
+#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
+ DEFINE_TRACE(name)
+
+#undef TRACE_FORMAT
+#define TRACE_FORMAT(name, proto, args, print) \
+ DEFINE_TRACE(name)
+
+#undef DECLARE_TRACE
+#define DECLARE_TRACE(name, proto, args) \
+ DEFINE_TRACE(name)
+
+#undef TRACE_INCLUDE
+#undef __TRACE_INCLUDE
+
+#ifndef TRACE_INCLUDE_FILE
+# define TRACE_INCLUDE_FILE TRACE_SYSTEM
+# define UNDEF_TRACE_INCLUDE_FILE
+#endif
+
+#ifndef TRACE_INCLUDE_PATH
+# define __TRACE_INCLUDE(system) <trace/system.h>
+# define UNDEF_TRACE_INCLUDE_FILE
+#else
+# define __TRACE_INCLUDE(system) __stringify(TRACE_INCLUDE_PATH/system.h)
+#endif
+
+# define TRACE_INCLUDE(system) __TRACE_INCLUDE(system)
+
+/* Let the trace headers be reread */
+#define TRACE_HEADER_MULTI_READ
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+#undef TRACE_HEADER_MULTI_READ
+
+/* Only undef what we defined in this file */
+#ifdef UNDEF_TRACE_INCLUDE_FILE
+# undef TRACE_INCLUDE_PATH
+# undef UNDEF_TRACE_INCLUDE_FILE
+#endif
+
+#ifdef UNDEF_TRACE_INCLUDE_FILE
+# undef TRACE_INCLUDE_PATH
+# undef UNDEF_TRACE_INCLUDE_FILE
+#endif
+
+/* We may be processing more files */
+#define CREATE_TRACE_POINTS
+
+#endif /* CREATE_TRACE_POINTS */
diff --git a/include/trace/irq.h b/include/trace/irq.h
index 04ab4c6..75e3468 100644
--- a/include/trace/irq.h
+++ b/include/trace/irq.h
@@ -51,4 +51,7 @@ TRACE_FORMAT(softirq_exit,
TP_FMT("softirq=%d action=%s", (int)(h - vec), softirq_to_name[h-vec])
);

-#endif
+#endif /* _TRACE_IRQ_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/include/trace/kmem.h b/include/trace/kmem.h
index d7d1218..c22c42f 100644
--- a/include/trace/kmem.h
+++ b/include/trace/kmem.h
@@ -188,5 +188,7 @@ TRACE_EVENT(kmem_cache_free,

TP_printk("call_site=%lx ptr=%p", __entry->call_site, __entry->ptr)
);
+#endif /* _TRACE_KMEM_H */

-#endif
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/include/trace/lockdep.h b/include/trace/lockdep.h
index 8ee7900..4d301e7 100644
--- a/include/trace/lockdep.h
+++ b/include/trace/lockdep.h
@@ -55,3 +55,6 @@ TRACE_EVENT(lock_acquired,
#endif

#endif /* _TRACE_LOCKDEP_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/include/trace/sched.h b/include/trace/sched.h
index 5b1cf4a..ffa1cab 100644
--- a/include/trace/sched.h
+++ b/include/trace/sched.h
@@ -334,3 +334,6 @@ TRACE_EVENT(sched_signal_send,
);

#endif /* _TRACE_SCHED_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/include/trace/skb.h b/include/trace/skb.h
index e6fd281..1e8fabb 100644
--- a/include/trace/skb.h
+++ b/include/trace/skb.h
@@ -35,3 +35,6 @@ TRACE_EVENT(kfree_skb,
);

#endif /* _TRACE_SKB_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/kernel/exit.c b/kernel/exit.c
index abf9cf3..2fe9d2c 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -56,10 +56,6 @@
#include <asm/mmu_context.h>
#include "cred-internals.h"

-DEFINE_TRACE(sched_process_free);
-DEFINE_TRACE(sched_process_exit);
-DEFINE_TRACE(sched_process_wait);
-
static void exit_mm(struct task_struct * tsk);

static void __unhash_process(struct task_struct *p)
diff --git a/kernel/fork.c b/kernel/fork.c
index b9e2edd..4bebf26 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -83,8 +83,6 @@ DEFINE_PER_CPU(unsigned long, process_counts) = 0;

__cacheline_aligned DEFINE_RWLOCK(tasklist_lock); /* outer */

-DEFINE_TRACE(sched_process_fork);
-
int nr_processes(void)
{
int cpu;
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index d82142b..983d8be 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -17,9 +17,11 @@
#include <linux/kernel_stat.h>
#include <linux/rculist.h>
#include <linux/hash.h>
-#include <trace/irq.h>
#include <linux/bootmem.h>

+#define CREATE_TRACE_POINTS
+#include <trace/irq.h>
+
#include "internals.h"

/*
@@ -348,9 +350,6 @@ static void warn_no_thread(unsigned int irq, struct irqaction *action)
"but no thread function available.", irq, action->name);
}

-DEFINE_TRACE(irq_handler_entry);
-DEFINE_TRACE(irq_handler_exit);
-
/**
* handle_IRQ_event - irq action chain handler
* @irq: the interrupt number
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 4ebaf85..e1c7692 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -21,9 +21,6 @@ static DEFINE_SPINLOCK(kthread_create_lock);
static LIST_HEAD(kthread_create_list);
struct task_struct *kthreadd_task;

-DEFINE_TRACE(sched_kthread_stop);
-DEFINE_TRACE(sched_kthread_stop_ret);
-
struct kthread_create_info
{
/* Information passed to kthread() from kthreadd. */
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index c4582a6..257f21a 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -42,12 +42,14 @@
#include <linux/hash.h>
#include <linux/ftrace.h>
#include <linux/stringify.h>
-#include <trace/lockdep.h>

#include <asm/sections.h>

#include "lockdep_internals.h"

+#define CREATE_TRACE_POINTS
+#include <trace/lockdep.h>
+
#ifdef CONFIG_PROVE_LOCKING
int prove_locking = 1;
module_param(prove_locking, int, 0644);
@@ -2929,8 +2931,6 @@ void lock_set_class(struct lockdep_map *lock, const char *name,
}
EXPORT_SYMBOL_GPL(lock_set_class);

-DEFINE_TRACE(lock_acquire);
-
/*
* We are not always called with irqs disabled - do that here,
* and also avoid lockdep recursion:
@@ -2957,8 +2957,6 @@ void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
}
EXPORT_SYMBOL_GPL(lock_acquire);

-DEFINE_TRACE(lock_release);
-
void lock_release(struct lockdep_map *lock, int nested,
unsigned long ip)
{
@@ -3061,8 +3059,6 @@ found_it:
put_lock_stats(stats);
}

-DEFINE_TRACE(lock_acquired);
-
static void
__lock_acquired(struct lockdep_map *lock, unsigned long ip)
{
@@ -3118,8 +3114,6 @@ found_it:
lock->ip = ip;
}

-DEFINE_TRACE(lock_contended);
-
void lock_contended(struct lockdep_map *lock, unsigned long ip)
{
unsigned long flags;
diff --git a/kernel/sched.c b/kernel/sched.c
index 5724508..e6d4518 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -72,13 +72,15 @@
#include <linux/debugfs.h>
#include <linux/ctype.h>
#include <linux/ftrace.h>
-#include <trace/sched.h>

#include <asm/tlb.h>
#include <asm/irq_regs.h>

#include "sched_cpupri.h"

+#define CREATE_TRACE_POINTS
+#include <trace/sched.h>
+
/*
* Convert user-nice values [ -20 ... 0 ... 19 ]
* to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
@@ -118,12 +120,6 @@
*/
#define RUNTIME_INF ((u64)~0ULL)

-DEFINE_TRACE(sched_wait_task);
-DEFINE_TRACE(sched_wakeup);
-DEFINE_TRACE(sched_wakeup_new);
-DEFINE_TRACE(sched_switch);
-DEFINE_TRACE(sched_migrate_task);
-
#ifdef CONFIG_SMP

static void double_rq_lock(struct rq *rq1, struct rq *rq2);
diff --git a/kernel/signal.c b/kernel/signal.c
index d803473..1d5703f 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -41,8 +41,6 @@

static struct kmem_cache *sigqueue_cachep;

-DEFINE_TRACE(sched_signal_send);
-
static void __user *sig_handler(struct task_struct *t, int sig)
{
return t->sighand->action[sig - 1].sa.sa_handler;
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 2fecefa..a2d9b45 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -186,9 +186,6 @@ EXPORT_SYMBOL(local_bh_enable_ip);
*/
#define MAX_SOFTIRQ_RESTART 10

-DEFINE_TRACE(softirq_entry);
-DEFINE_TRACE(softirq_exit);
-
asmlinkage void __do_softirq(void)
{
struct softirq_action *h;
diff --git a/mm/util.c b/mm/util.c
index 2599e83..0e74a22 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -4,9 +4,11 @@
#include <linux/module.h>
#include <linux/err.h>
#include <linux/sched.h>
-#include <linux/tracepoint.h>
#include <asm/uaccess.h>

+#define CREATE_TRACE_POINTS
+#include <trace/kmem.h>
+
/**
* kstrdup - allocate space for and copy an existing string
* @s: the string to duplicate
@@ -239,13 +241,6 @@ int __attribute__((weak)) get_user_pages_fast(unsigned long start,
EXPORT_SYMBOL_GPL(get_user_pages_fast);

/* Tracepoints definitions. */
-DEFINE_TRACE(kmalloc);
-DEFINE_TRACE(kmem_cache_alloc);
-DEFINE_TRACE(kmalloc_node);
-DEFINE_TRACE(kmem_cache_alloc_node);
-DEFINE_TRACE(kfree);
-DEFINE_TRACE(kmem_cache_free);
-
EXPORT_TRACEPOINT_SYMBOL(kmalloc);
EXPORT_TRACEPOINT_SYMBOL(kmem_cache_alloc);
EXPORT_TRACEPOINT_SYMBOL(kmalloc_node);
diff --git a/net/core/net-traces.c b/net/core/net-traces.c
index c8fb456..8017720 100644
--- a/net/core/net-traces.c
+++ b/net/core/net-traces.c
@@ -19,11 +19,11 @@
#include <linux/workqueue.h>
#include <linux/netlink.h>
#include <linux/net_dropmon.h>
-#include <trace/skb.h>

#include <asm/unaligned.h>
#include <asm/bitops.h>

+#define CREATE_TRACE_POINTS
+#include <trace/skb.h>

-DEFINE_TRACE(kfree_skb);
EXPORT_TRACEPOINT_SYMBOL_GPL(kfree_skb);
--
1.6.2.1
--


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