src/patches/suse-2.6.27.25/patches.trace/tracepoints-samples.patch

   1 From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
   2 Subject: Tracepoints Samples
   3
   4 Tracepoint example code under samples/.
   5
   6 Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
   7 Acked-by: 'Peter Zijlstra' <peterz@infradead.org>
   8 CC: Masami Hiramatsu <mhiramat@redhat.com>
   9 CC: "Frank Ch. Eigler" <fche@redhat.com>
  10 CC: 'Ingo Molnar' <mingo@elte.hu>
  11 CC: 'Hideo AOKI' <haoki@redhat.com>
  12 CC: Takashi Nishiie <t-nishiie@np.css.fujitsu.com>
  13 CC: 'Steven Rostedt' <rostedt@goodmis.org>
  14 CC: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
  15 Acked-by: Jan Blunck <jblunck@suse.de>
  16 ---
  17  samples/Kconfig                                |    6 ++
  18  samples/Makefile                               |    2
  19  samples/tracepoints/Makefile                   |    6 ++
  20  samples/tracepoints/tp-samples-trace.h         |   13 +++++
  21  samples/tracepoints/tracepoint-probe-sample.c  |   55 +++++++++++++++++++++++++
  22  samples/tracepoints/tracepoint-probe-sample2.c |   42 +++++++++++++++++++
  23  samples/tracepoints/tracepoint-sample.c        |   53 ++++++++++++++++++++++++
  24  7 files changed, 176 insertions(+), 1 deletion(-)
  25
  26 Index: linux-2.6-lttng/samples/Kconfig
  27 ===================================================================
  28 --- linux-2.6-lttng.orig/samples/Kconfig        2008-07-07 09:59:25.000000000 -0400
  29 +++ linux-2.6-lttng/samples/Kconfig     2008-07-07 10:00:07.000000000 -0400
  30 @@ -13,6 +13,12 @@ config SAMPLE_MARKERS
  31         help
  32           This build markers example modules.
  33
  34 +config SAMPLE_TRACEPOINTS
  35 +       tristate "Build tracepoints examples -- loadable modules only"
  36 +       depends on TRACEPOINTS && m
  37 +       help
  38 +         This build tracepoints example modules.
  39 +
  40  config SAMPLE_KOBJECT
  41         tristate "Build kobject examples"
  42         help
  43 Index: linux-2.6-lttng/samples/tracepoints/Makefile
  44 ===================================================================
  45 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  46 +++ linux-2.6-lttng/samples/tracepoints/Makefile        2008-07-07 10:53:09.000000000 -0400
  47 @@ -0,0 +1,6 @@
  48 +# builds the tracepoint example kernel modules;
  49 +# then to use one (as root):  insmod <module_name.ko>
  50 +
  51 +obj-$(CONFIG_SAMPLE_TRACEPOINTS) += tracepoint-sample.o
  52 +obj-$(CONFIG_SAMPLE_TRACEPOINTS) += tracepoint-probe-sample.o
  53 +obj-$(CONFIG_SAMPLE_TRACEPOINTS) += tracepoint-probe-sample2.o
  54 Index: linux-2.6-lttng/samples/tracepoints/tracepoint-probe-sample.c
  55 ===================================================================
  56 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  57 +++ linux-2.6-lttng/samples/tracepoints/tracepoint-probe-sample.c       2008-07-07 10:50:26.000000000 -0400
  58 @@ -0,0 +1,55 @@
  59 +/*
  60 + * tracepoint-probe-sample.c
  61 + *
  62 + * sample tracepoint probes.
  63 + */
  64 +
  65 +#include <linux/module.h>
  66 +#include <linux/file.h>
  67 +#include <linux/dcache.h>
  68 +#include "tp-samples-trace.h"
  69 +
  70 +/*
  71 + * Here the caller only guarantees locking for struct file and struct inode.
  72 + * Locking must therefore be done in the probe to use the dentry.
  73 + */
  74 +static void probe_subsys_event(struct inode *inode, struct file *file)
  75 +{
  76 +       path_get(&file->f_path);
  77 +       dget(file->f_path.dentry);
  78 +       printk(KERN_INFO "Event is encountered with filename %s\n",
  79 +               file->f_path.dentry->d_name.name);
  80 +       dput(file->f_path.dentry);
  81 +       path_put(&file->f_path);
  82 +}
  83 +
  84 +static void probe_subsys_eventb(void)
  85 +{
  86 +       printk(KERN_INFO "Event B is encountered\n");
  87 +}
  88 +
  89 +int __init tp_sample_trace_init(void)
  90 +{
  91 +       int ret;
  92 +
  93 +       ret = register_trace_subsys_event(probe_subsys_event);
  94 +       WARN_ON(ret);
  95 +       ret = register_trace_subsys_eventb(probe_subsys_eventb);
  96 +       WARN_ON(ret);
  97 +
  98 +       return 0;
  99 +}
 100 +
 101 +module_init(tp_sample_trace_init);
 102 +
 103 +void __exit tp_sample_trace_exit(void)
 104 +{
 105 +       unregister_trace_subsys_eventb(probe_subsys_eventb);
 106 +       unregister_trace_subsys_event(probe_subsys_event);
 107 +}
 108 +
 109 +module_exit(tp_sample_trace_exit);
 110 +
 111 +MODULE_LICENSE("GPL");
 112 +MODULE_AUTHOR("Mathieu Desnoyers");
 113 +MODULE_DESCRIPTION("Tracepoint Probes Samples");
 114 Index: linux-2.6-lttng/samples/tracepoints/tracepoint-sample.c
 115 ===================================================================
 116 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
 117 +++ linux-2.6-lttng/samples/tracepoints/tracepoint-sample.c     2008-07-07 10:04:16.000000000 -0400
 118 @@ -0,0 +1,53 @@
 119 +/* tracepoint-sample.c
 120 + *
 121 + * Executes a tracepoint when /proc/tracepoint-example is opened.
 122 + *
 123 + * (C) Copyright 2007 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
 124 + *
 125 + * This file is released under the GPLv2.
 126 + * See the file COPYING for more details.
 127 + */
 128 +
 129 +#include <linux/module.h>
 130 +#include <linux/sched.h>
 131 +#include <linux/proc_fs.h>
 132 +#include "tp-samples-trace.h"
 133 +
 134 +struct proc_dir_entry *pentry_example;
 135 +
 136 +static int my_open(struct inode *inode, struct file *file)
 137 +{
 138 +       int i;
 139 +
 140 +       trace_subsys_event(inode, file);
 141 +       for (i = 0; i < 10; i++)
 142 +               trace_subsys_eventb();
 143 +       return -EPERM;
 144 +}
 145 +
 146 +static struct file_operations mark_ops = {
 147 +       .open = my_open,
 148 +};
 149 +
 150 +static int example_init(void)
 151 +{
 152 +       printk(KERN_ALERT "example init\n");
 153 +       pentry_example = proc_create("tracepoint-example", 0444, NULL,
 154 +               &mark_ops);
 155 +       if (!pentry_example)
 156 +               return -EPERM;
 157 +       return 0;
 158 +}
 159 +
 160 +static void example_exit(void)
 161 +{
 162 +       printk(KERN_ALERT "example exit\n");
 163 +       remove_proc_entry("tracepoint-example", NULL);
 164 +}
 165 +
 166 +module_init(example_init)
 167 +module_exit(example_exit)
 168 +
 169 +MODULE_LICENSE("GPL");
 170 +MODULE_AUTHOR("Mathieu Desnoyers");
 171 +MODULE_DESCRIPTION("Tracepoint example");
 172 Index: linux-2.6-lttng/samples/tracepoints/tp-samples-trace.h
 173 ===================================================================
 174 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
 175 +++ linux-2.6-lttng/samples/tracepoints/tp-samples-trace.h      2008-07-07 10:06:26.000000000 -0400
 176 @@ -0,0 +1,13 @@
 177 +#ifndef _TP_SAMPLES_TRACE_H
 178 +#define _TP_SAMPLES_TRACE_H
 179 +
 180 +#include <linux/proc_fs.h>     /* for struct inode and struct file */
 181 +#include <linux/tracepoint.h>
 182 +
 183 +DEFINE_TRACE(subsys_event,
 184 +       TPPROTO(struct inode *inode, struct file *file),
 185 +       TPARGS(inode, file));
 186 +DEFINE_TRACE(subsys_eventb,
 187 +       TPPROTO(void),
 188 +       TPARGS());
 189 +#endif
 190 Index: linux-2.6-lttng/samples/Makefile
 191 ===================================================================
 192 --- linux-2.6-lttng.orig/samples/Makefile       2008-07-07 10:44:50.000000000 -0400
 193 +++ linux-2.6-lttng/samples/Makefile    2008-07-07 10:44:59.000000000 -0400
 194 @@ -1,3 +1,3 @@
 195  # Makefile for Linux samples code
 196
 197 -obj-$(CONFIG_SAMPLES)  += markers/ kobject/ kprobes/
 198 +obj-$(CONFIG_SAMPLES)  += markers/ kobject/ kprobes/ tracepoints/
 199 Index: linux-2.6-lttng/samples/tracepoints/tracepoint-probe-sample2.c
 200 ===================================================================
 201 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
 202 +++ linux-2.6-lttng/samples/tracepoints/tracepoint-probe-sample2.c      2008-07-07 10:56:09.000000000 -0400
 203 @@ -0,0 +1,42 @@
 204 +/*
 205 + * tracepoint-probe-sample2.c
 206 + *
 207 + * 2nd sample tracepoint probes.
 208 + */
 209 +
 210 +#include <linux/module.h>
 211 +#include <linux/fs.h>
 212 +#include "tp-samples-trace.h"
 213 +
 214 +/*
 215 + * Here the caller only guarantees locking for struct file and struct inode.
 216 + * Locking must therefore be done in the probe to use the dentry.
 217 + */
 218 +static void probe_subsys_event(struct inode *inode, struct file *file)
 219 +{
 220 +       printk(KERN_INFO "Event is encountered with inode number %lu\n",
 221 +               inode->i_ino);
 222 +}
 223 +
 224 +int __init tp_sample_trace_init(void)
 225 +{
 226 +       int ret;
 227 +
 228 +       ret = register_trace_subsys_event(probe_subsys_event);
 229 +       WARN_ON(ret);
 230 +
 231 +       return 0;
 232 +}
 233 +
 234 +module_init(tp_sample_trace_init);
 235 +
 236 +void __exit tp_sample_trace_exit(void)
 237 +{
 238 +       unregister_trace_subsys_event(probe_subsys_event);
 239 +}
 240 +
 241 +module_exit(tp_sample_trace_exit);
 242 +
 243 +MODULE_LICENSE("GPL");
 244 +MODULE_AUTHOR("Mathieu Desnoyers");
 245 +MODULE_DESCRIPTION("Tracepoint Probes Samples");