Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=31155bc03e35a8d2b2551bc2eea3da5791e1b776
Commit: 31155bc03e35a8d2b2551bc2eea3da5791e1b776
Parent: 267c4025f2e198a4e551556a6db31a554ca51814
Author: Mathieu Desnoyers <[EMAIL PROTECTED]>
AuthorDate: Thu Oct 18 23:41:08 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Fri Oct 19 11:53:55 2007 -0700
Linux Kernel Markers - Samples
Module example showing how to use the Linux Kernel Markers.
[EMAIL PROTECTED]: coding-style fixes]
Signed-off-by: Mathieu Desnoyers <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
include/linux/marker.h | 1 -
samples/Kconfig | 5 ++
samples/Makefile | 3 +
samples/markers/Makefile | 4 ++
samples/markers/marker-example.c | 54 +++++++++++++++++++++
samples/markers/probe-example.c | 98 ++++++++++++++++++++++++++++++++++++++
6 files changed, 164 insertions(+), 1 deletions(-)
diff --git a/include/linux/marker.h b/include/linux/marker.h
index 8038d89..5f36cf9 100644
--- a/include/linux/marker.h
+++ b/include/linux/marker.h
@@ -61,7 +61,6 @@ struct marker {
__attribute__((section("__markers"), aligned(8))) = \
{ __mstrtab_name_##name, __mstrtab_format_##name, \
0, __mark_empty_function, NULL }; \
- asm volatile("" : : "i" (&__mark_##name)); \
__mark_check_format(format, ## args); \
if (unlikely(__mark_##name.state)) { \
preempt_disable(); \
diff --git a/samples/Kconfig b/samples/Kconfig
index b46b4cf..57bb223 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -7,5 +7,10 @@ menuconfig SAMPLES
if SAMPLES
+config SAMPLE_MARKERS
+ tristate "Build markers examples -- loadable modules only"
+ depends on MARKERS && m
+ help
+ This build markers example modules.
endif # SAMPLES
diff --git a/samples/Makefile b/samples/Makefile
new file mode 100644
index 0000000..5a4f0b6
--- /dev/null
+++ b/samples/Makefile
@@ -0,0 +1,3 @@
+# Makefile for Linux samples code
+
+obj-$(CONFIG_SAMPLES) += markers/
diff --git a/samples/markers/Makefile b/samples/markers/Makefile
new file mode 100644
index 0000000..6d72312
--- /dev/null
+++ b/samples/markers/Makefile
@@ -0,0 +1,4 @@
+# builds the kprobes example kernel modules;
+# then to use one (as root): insmod <module_name.ko>
+
+obj-$(CONFIG_SAMPLE_MARKERS) += probe-example.o marker-example.o
diff --git a/samples/markers/marker-example.c b/samples/markers/marker-example.c
new file mode 100644
index 0000000..e787c6d
--- /dev/null
+++ b/samples/markers/marker-example.c
@@ -0,0 +1,54 @@
+/* marker-example.c
+ *
+ * Executes a marker when /proc/marker-example is opened.
+ *
+ * (C) Copyright 2007 Mathieu Desnoyers <[EMAIL PROTECTED]>
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/marker.h>
+#include <linux/sched.h>
+#include <linux/proc_fs.h>
+
+struct proc_dir_entry *pentry_example;
+
+static int my_open(struct inode *inode, struct file *file)
+{
+ int i;
+
+ trace_mark(subsystem_event, "%d %s", 123, "example string");
+ for (i = 0; i < 10; i++)
+ trace_mark(subsystem_eventb, MARK_NOARGS);
+ return -EPERM;
+}
+
+static struct file_operations mark_ops = {
+ .open = my_open,
+};
+
+static int example_init(void)
+{
+ printk(KERN_ALERT "example init\n");
+ pentry_example = create_proc_entry("marker-example", 0444, NULL);
+ if (pentry_example)
+ pentry_example->proc_fops = &mark_ops;
+ else
+ return -EPERM;
+ return 0;
+}
+
+static void example_exit(void)
+{
+ printk(KERN_ALERT "example exit\n");
+ remove_proc_entry("marker-example", NULL);
+}
+
+module_init(example_init)
+module_exit(example_exit)
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mathieu Desnoyers");
+MODULE_DESCRIPTION("Marker example");
diff --git a/samples/markers/probe-example.c b/samples/markers/probe-example.c
new file mode 100644
index 0000000..238b2e3
--- /dev/null
+++ b/samples/markers/probe-example.c
@@ -0,0 +1,98 @@
+/* probe-example.c
+ *
+ * Connects two functions to marker call sites.
+ *
+ * (C) Copyright 2007 Mathieu Desnoyers <[EMAIL PROTECTED]>
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/marker.h>
+#include <asm/atomic.h>
+
+struct probe_data {
+ const char *name;
+ const char *format;
+ marker_probe_func *probe_func;
+};
+
+void probe_subsystem_event(const struct marker *mdata, void *private,
+ const char *format, ...)
+{
+ va_list ap;
+ /* Declare args */
+ unsigned int value;
+ const char *mystr;
+
+ /* Assign args */
+ va_start(ap, format);
+ value = va_arg(ap, typeof(value));
+ mystr = va_arg(ap, typeof(mystr));
+
+ /* Call printk */
+ printk(KERN_DEBUG "Value %u, string %s\n", value, mystr);
+
+ /* or count, check rights, serialize data in a buffer */
+
+ va_end(ap);
+}
+
+atomic_t eventb_count = ATOMIC_INIT(0);
+
+void probe_subsystem_eventb(const struct marker *mdata, void *private,
+ const char *format, ...)
+{
+ /* Increment counter */
+ atomic_inc(&eventb_count);
+}
+
+static struct probe_data probe_array[] =
+{
+ { .name = "subsystem_event",
+ .format = "%d %s",
+ .probe_func = probe_subsystem_event },
+ { .name = "subsystem_eventb",
+ .format = MARK_NOARGS,
+ .probe_func = probe_subsystem_eventb },
+};
+
+static int __init probe_init(void)
+{
+ int result;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(probe_array); i++) {
+ result = marker_probe_register(probe_array[i].name,
+ probe_array[i].format,
+ probe_array[i].probe_func, &probe_array[i]);
+ if (result)
+ printk(KERN_INFO "Unable to register probe %s\n",
+ probe_array[i].name);
+ result = marker_arm(probe_array[i].name);
+ if (result)
+ printk(KERN_INFO "Unable to arm probe %s\n",
+ probe_array[i].name);
+ }
+ return 0;
+}
+
+static void __exit probe_fini(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(probe_array); i++)
+ marker_probe_unregister(probe_array[i].name);
+ printk(KERN_INFO "Number of event b : %u\n",
+ atomic_read(&eventb_count));
+}
+
+module_init(probe_init);
+module_exit(probe_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mathieu Desnoyers");
+MODULE_DESCRIPTION("SUBSYSTEM Probe");
-
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