--- /dev/null
+From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+Subject: Tracepoints Samples
+
+Tracepoint example code under samples/.
+
+Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+Acked-by: 'Peter Zijlstra' <peterz@infradead.org>
+CC: Masami Hiramatsu <mhiramat@redhat.com>
+CC: "Frank Ch. Eigler" <fche@redhat.com>
+CC: 'Ingo Molnar' <mingo@elte.hu>
+CC: 'Hideo AOKI' <haoki@redhat.com>
+CC: Takashi Nishiie <t-nishiie@np.css.fujitsu.com>
+CC: 'Steven Rostedt' <rostedt@goodmis.org>
+CC: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
+Acked-by: Jan Blunck <jblunck@suse.de>
+---
+ samples/Kconfig | 6 ++
+ samples/Makefile | 2
+ samples/tracepoints/Makefile | 6 ++
+ samples/tracepoints/tp-samples-trace.h | 13 +++++
+ samples/tracepoints/tracepoint-probe-sample.c | 55 +++++++++++++++++++++++++
+ samples/tracepoints/tracepoint-probe-sample2.c | 42 +++++++++++++++++++
+ samples/tracepoints/tracepoint-sample.c | 53 ++++++++++++++++++++++++
+ 7 files changed, 176 insertions(+), 1 deletion(-)
+
+Index: linux-2.6-lttng/samples/Kconfig
+===================================================================
+--- linux-2.6-lttng.orig/samples/Kconfig 2008-07-07 09:59:25.000000000 -0400
++++ linux-2.6-lttng/samples/Kconfig 2008-07-07 10:00:07.000000000 -0400
+@@ -13,6 +13,12 @@ config SAMPLE_MARKERS
+ help
+ This build markers example modules.
+
++config SAMPLE_TRACEPOINTS
++ tristate "Build tracepoints examples -- loadable modules only"
++ depends on TRACEPOINTS && m
++ help
++ This build tracepoints example modules.
++
+ config SAMPLE_KOBJECT
+ tristate "Build kobject examples"
+ help
+Index: linux-2.6-lttng/samples/tracepoints/Makefile
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6-lttng/samples/tracepoints/Makefile 2008-07-07 10:53:09.000000000 -0400
+@@ -0,0 +1,6 @@
++# builds the tracepoint example kernel modules;
++# then to use one (as root): insmod <module_name.ko>
++
++obj-$(CONFIG_SAMPLE_TRACEPOINTS) += tracepoint-sample.o
++obj-$(CONFIG_SAMPLE_TRACEPOINTS) += tracepoint-probe-sample.o
++obj-$(CONFIG_SAMPLE_TRACEPOINTS) += tracepoint-probe-sample2.o
+Index: linux-2.6-lttng/samples/tracepoints/tracepoint-probe-sample.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6-lttng/samples/tracepoints/tracepoint-probe-sample.c 2008-07-07 10:50:26.000000000 -0400
+@@ -0,0 +1,55 @@
++/*
++ * tracepoint-probe-sample.c
++ *
++ * sample tracepoint probes.
++ */
++
++#include <linux/module.h>
++#include <linux/file.h>
++#include <linux/dcache.h>
++#include "tp-samples-trace.h"
++
++/*
++ * Here the caller only guarantees locking for struct file and struct inode.
++ * Locking must therefore be done in the probe to use the dentry.
++ */
++static void probe_subsys_event(struct inode *inode, struct file *file)
++{
++ path_get(&file->f_path);
++ dget(file->f_path.dentry);
++ printk(KERN_INFO "Event is encountered with filename %s\n",
++ file->f_path.dentry->d_name.name);
++ dput(file->f_path.dentry);
++ path_put(&file->f_path);
++}
++
++static void probe_subsys_eventb(void)
++{
++ printk(KERN_INFO "Event B is encountered\n");
++}
++
++int __init tp_sample_trace_init(void)
++{
++ int ret;
++
++ ret = register_trace_subsys_event(probe_subsys_event);
++ WARN_ON(ret);
++ ret = register_trace_subsys_eventb(probe_subsys_eventb);
++ WARN_ON(ret);
++
++ return 0;
++}
++
++module_init(tp_sample_trace_init);
++
++void __exit tp_sample_trace_exit(void)
++{
++ unregister_trace_subsys_eventb(probe_subsys_eventb);
++ unregister_trace_subsys_event(probe_subsys_event);
++}
++
++module_exit(tp_sample_trace_exit);
++
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("Mathieu Desnoyers");
++MODULE_DESCRIPTION("Tracepoint Probes Samples");
+Index: linux-2.6-lttng/samples/tracepoints/tracepoint-sample.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6-lttng/samples/tracepoints/tracepoint-sample.c 2008-07-07 10:04:16.000000000 -0400
+@@ -0,0 +1,53 @@
++/* tracepoint-sample.c
++ *
++ * Executes a tracepoint when /proc/tracepoint-example is opened.
++ *
++ * (C) Copyright 2007 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
++ *
++ * This file is released under the GPLv2.
++ * See the file COPYING for more details.
++ */
++
++#include <linux/module.h>
++#include <linux/sched.h>
++#include <linux/proc_fs.h>
++#include "tp-samples-trace.h"
++
++struct proc_dir_entry *pentry_example;
++
++static int my_open(struct inode *inode, struct file *file)
++{
++ int i;
++
++ trace_subsys_event(inode, file);
++ for (i = 0; i < 10; i++)
++ trace_subsys_eventb();
++ return -EPERM;
++}
++
++static struct file_operations mark_ops = {
++ .open = my_open,
++};
++
++static int example_init(void)
++{
++ printk(KERN_ALERT "example init\n");
++ pentry_example = proc_create("tracepoint-example", 0444, NULL,
++ &mark_ops);
++ if (!pentry_example)
++ return -EPERM;
++ return 0;
++}
++
++static void example_exit(void)
++{
++ printk(KERN_ALERT "example exit\n");
++ remove_proc_entry("tracepoint-example", NULL);
++}
++
++module_init(example_init)
++module_exit(example_exit)
++
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("Mathieu Desnoyers");
++MODULE_DESCRIPTION("Tracepoint example");
+Index: linux-2.6-lttng/samples/tracepoints/tp-samples-trace.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6-lttng/samples/tracepoints/tp-samples-trace.h 2008-07-07 10:06:26.000000000 -0400
+@@ -0,0 +1,13 @@
++#ifndef _TP_SAMPLES_TRACE_H
++#define _TP_SAMPLES_TRACE_H
++
++#include <linux/proc_fs.h> /* for struct inode and struct file */
++#include <linux/tracepoint.h>
++
++DEFINE_TRACE(subsys_event,
++ TPPROTO(struct inode *inode, struct file *file),
++ TPARGS(inode, file));
++DEFINE_TRACE(subsys_eventb,
++ TPPROTO(void),
++ TPARGS());
++#endif
+Index: linux-2.6-lttng/samples/Makefile
+===================================================================
+--- linux-2.6-lttng.orig/samples/Makefile 2008-07-07 10:44:50.000000000 -0400
++++ linux-2.6-lttng/samples/Makefile 2008-07-07 10:44:59.000000000 -0400
+@@ -1,3 +1,3 @@
+ # Makefile for Linux samples code
+
+-obj-$(CONFIG_SAMPLES) += markers/ kobject/ kprobes/
++obj-$(CONFIG_SAMPLES) += markers/ kobject/ kprobes/ tracepoints/
+Index: linux-2.6-lttng/samples/tracepoints/tracepoint-probe-sample2.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6-lttng/samples/tracepoints/tracepoint-probe-sample2.c 2008-07-07 10:56:09.000000000 -0400
+@@ -0,0 +1,42 @@
++/*
++ * tracepoint-probe-sample2.c
++ *
++ * 2nd sample tracepoint probes.
++ */
++
++#include <linux/module.h>
++#include <linux/fs.h>
++#include "tp-samples-trace.h"
++
++/*
++ * Here the caller only guarantees locking for struct file and struct inode.
++ * Locking must therefore be done in the probe to use the dentry.
++ */
++static void probe_subsys_event(struct inode *inode, struct file *file)
++{
++ printk(KERN_INFO "Event is encountered with inode number %lu\n",
++ inode->i_ino);
++}
++
++int __init tp_sample_trace_init(void)
++{
++ int ret;
++
++ ret = register_trace_subsys_event(probe_subsys_event);
++ WARN_ON(ret);
++
++ return 0;
++}
++
++module_init(tp_sample_trace_init);
++
++void __exit tp_sample_trace_exit(void)
++{
++ unregister_trace_subsys_event(probe_subsys_event);
++}
++
++module_exit(tp_sample_trace_exit);
++
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("Mathieu Desnoyers");
++MODULE_DESCRIPTION("Tracepoint Probes Samples");
projects / people / pmueller / ipfire-2.x.git / blobdiff