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authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>2008-07-18 12:16:16 -0400
committerIngo Molnar <mingo@elte.hu>2008-10-14 10:29:05 +0200
commit4a0897526bbc5c6ac0df80b16b8c60339e717ae2 (patch)
treeaa8eb17c791cdff175f8cd6cb76f02d05f00029a /samples/tracepoints/tracepoint-sample.c
parent24b8d831d56aac7907752d22d2aba5d8127db6f6 (diff)
downloadop-kernel-dev-4a0897526bbc5c6ac0df80b16b8c60339e717ae2.zip
op-kernel-dev-4a0897526bbc5c6ac0df80b16b8c60339e717ae2.tar.gz
tracing: tracepoints, samples
Tracepoint example code under samples/. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Acked-by: 'Peter Zijlstra' <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'samples/tracepoints/tracepoint-sample.c')
-rw-r--r--samples/tracepoints/tracepoint-sample.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/samples/tracepoints/tracepoint-sample.c b/samples/tracepoints/tracepoint-sample.c
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--- /dev/null
+++ b/samples/tracepoints/tracepoint-sample.c
@@ -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");
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