Commit 0a5d6490 authored by Jody McIntyre's avatar Jody McIntyre Committed by Ingo Molnar

tracing: Documentation / sample code fixes for tracepoints

Fix the tracepoint documentation to refer to "tracepoint-sample"
instead of "tracepoint-example" to match what actually exists;
fix the directory, and clarify how to compile.

Change every instance of "example" in the sample tracepoint code
to "sample" for consistency.
Signed-off-by: default avatarJody McIntyre <>
Acked-by: default avatarMathieu Desnoyers <>
LKML-Reference: <20090324200027.GH8294@clouds>
Signed-off-by: default avatarIngo Molnar <>
parent a524446f
......@@ -103,13 +103,14 @@ used to export the defined tracepoints.
* Probe / tracepoint example
See the example provided in samples/tracepoints/src
See the example provided in samples/tracepoints
Compile them with your kernel.
Compile them with your kernel. They are built during 'make' (not
'make modules') when CONFIG_SAMPLE_TRACEPOINTS=m.
Run, as root :
modprobe tracepoint-example (insmod order is not important)
modprobe tracepoint-probe-example
cat /proc/tracepoint-example (returns an expected error)
rmmod tracepoint-example tracepoint-probe-example
modprobe tracepoint-sample (insmod order is not important)
modprobe tracepoint-probe-sample
cat /proc/tracepoint-sample (returns an expected error)
rmmod tracepoint-sample tracepoint-probe-sample
/* tracepoint-sample.c
* Executes a tracepoint when /proc/tracepoint-example is opened.
* Executes a tracepoint when /proc/tracepoint-sample is opened.
* (C) Copyright 2007 Mathieu Desnoyers <>
......@@ -16,7 +16,7 @@
struct proc_dir_entry *pentry_example;
struct proc_dir_entry *pentry_sample;
static int my_open(struct inode *inode, struct file *file)
......@@ -32,25 +32,25 @@ static struct file_operations mark_ops = {
.open = my_open,
static int __init example_init(void)
static int __init sample_init(void)
printk(KERN_ALERT "example init\n");
pentry_example = proc_create("tracepoint-example", 0444, NULL,
printk(KERN_ALERT "sample init\n");
pentry_sample = proc_create("tracepoint-sample", 0444, NULL,
if (!pentry_example)
if (!pentry_sample)
return -EPERM;
return 0;
static void __exit example_exit(void)
static void __exit sample_exit(void)
printk(KERN_ALERT "example exit\n");
remove_proc_entry("tracepoint-example", NULL);
printk(KERN_ALERT "sample exit\n");
remove_proc_entry("tracepoint-sample", NULL);
MODULE_AUTHOR("Mathieu Desnoyers");
MODULE_DESCRIPTION("Tracepoint example");
MODULE_DESCRIPTION("Tracepoint sample");
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