Hi,
Here is a new version of the LKM. I added support for a near jump as an
optimisation for i386. I guess that changing the one byte offset of the near
jump instruction won't have any effect on the i386 erratas, anyone can confirm
this ?
With this optimisation, the cost of this inactive marker shrinks from a memory
load+far jump to a near jump.
Feel free to implement similar optimisations for other architectures.
Mathieu
---BEGIN---
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -1082,6 +1082,8 @@ config KPROBES
for kernel debugging, non-intrusive instrumentation and testing.
If in doubt, say "N".
+source "kernel/Kconfig.marker"
+
source "ltt/Kconfig"
endmenu
--- /dev/null
+++ b/include/asm-alpha/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-arm/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-arm26/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-cris/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-frv/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-generic/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-h8300/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-i386/marker.h
@@ -0,0 +1,29 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. i386 architecture optimisations.
+ *
+ * (C) Copyright 2006 Mathieu Desnoyers <[email protected]>
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
+#define ARCH_HAS_MARK_NEAR_JUMP
+
+/* Note : max 256 bytes between over_label and near_jump */
+#define MARK_DO_JUMP(name) \
+ do { \
+ __label__ near_jump_select; \
+ volatile static void *__mark_jump_select_##name \
+ asm (MARK_JUMP_SELECT_PREFIX#name) \
+ __attribute__((unused)) = &&near_jump_select; \
+ asm volatile ( ".align 16;\n\t" : : ); \
+ asm volatile ( ".byte 0xeb;\n\t" : : ); \
+near_jump_select: \
+ asm volatile ( ".byte %0-%1;\n\t" : : \
+ "m" (*&&over_label), \
+ "m" (*&&call_label)); \
+call_label: \
+ asm volatile ( "" : : ); \
+ } while(0)
--- /dev/null
+++ b/include/asm-ia64/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-m32r/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-m68k/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-m68knommu/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-mips/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-parisc/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-powerpc/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-ppc/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-ppc64/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-s390/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-sh/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-sh64/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-sparc/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-sparc64/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-um/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-v850/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-x86_64/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/asm-xtensa/marker.h
@@ -0,0 +1,12 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. Architecture specific
+ * optimisations.
+ *
+ * No optimisation implemented.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
--- /dev/null
+++ b/include/linux/marker.h
@@ -0,0 +1,132 @@
+/*****************************************************************************
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing.
+ *
+ * Example :
+ *
+ * MARK(subsystem_event, "%d %s", someint, somestring);
+ * Where :
+ * - Subsystem is the name of your subsystem.
+ * - event is the name of the event to mark.
+ * - "%d %s" is the formatted string for printk.
+ * - someint is an integer.
+ * - somestring is a char *.
+ * - subsystem_event must be unique thorough the kernel!
+ *
+ * Dynamically overridable function call based on marker mechanism
+ * from Frank Ch. Eigler <[email protected]>.
+ *
+ * (C) Copyright 2006 Mathieu Desnoyers <[email protected]>
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
+#include <linux/linkage.h>
+
+#define MARK_KPROBE_PREFIX "__mark_kprobe_"
+#define MARK_CALL_PREFIX "__mark_call_"
+#define MARK_JUMP_SELECT_PREFIX "__mark_jump_select_"
+#define MARK_JUMP_CALL_PREFIX "__mark_jump_call_"
+#define MARK_JUMP_OVER_PREFIX "__mark_jump_over_"
+#define MARK_FORMAT_PREFIX "__mark_format_"
+
+#include <asm/marker.h>
+
+#define MARK_MAX_FORMAT_LEN 1024
+
+
+struct __mark_kprobe_marker {
+ const char *name;
+ const void *location;
+};
+
+#ifdef CONFIG_MARK_SYMBOL
+#define MARK_SYM(name, format, args...) \
+ do { \
+ __label__ here; \
+here: asm volatile(".section \".markers\"; .long %0, %1;\n\t" \
+ ".previous\n\t" : : "m" (*(MARK_KPROBE_PREFIX#name)), \
+ "m" (*&&here)); \
+ } while(0)
+#else
+#define MARK_SYM(name, format, args...)
+#endif
+
+#ifdef CONFIG_MARK_JUMP_CALL
+#define MARK_JUMP_CALL_PROTOTYPE(name) \
+ static marker_probe_func *__mark_call_##name \
+ asm (MARK_CALL_PREFIX#name) = \
+ __mark_empty_function
+#define MARK_JUMP_CALL(name, format, args...) \
+ do { \
+ preempt_disable(); \
+ (*__mark_call_##name)(format, ## args); \
+ preempt_enable_no_resched(); \
+ } while(0)
+#else
+#define MARK_JUMP_CALL_PROTOTYPE(name)
+#define MARK_JUMP_CALL(name, format, args...)
+#endif
+
+#ifndef ARCH_HAS_MARK_NEAR_JUMP
+#define MARK_DO_JUMP(name) \
+ goto *__mark_jump_select_##name; \
+call_label:
+#define MARK_JUMP_SELECT_DECLARE(name) \
+ volatile static void *__mark_jump_select_##name \
+ asm (MARK_JUMP_SELECT_PREFIX#name) \
+ __attribute__((unused)) = \
+ &&over_label
+#else
+#define MARK_JUMP_SELECT_DECLARE(name)
+#endif
+
+#ifndef FORCE_MARK_JUMP_INLINE
+#define MARK_JUMP(name, format, args...) \
+ do { \
+ __label__ over_label, call_label; \
+ volatile static void *__mark_jump_call_##name \
+ asm (MARK_JUMP_CALL_PREFIX#name) \
+ __attribute__((unused)) = \
+ &&call_label; \
+ volatile static void *__mark_jump_over_##name \
+ asm (MARK_JUMP_OVER_PREFIX#name) \
+ __attribute__((unused)) = \
+ &&over_label; \
+ static const char *__mark_format_##name \
+ asm (MARK_FORMAT_PREFIX#name) \
+ __attribute__((unused)) = \
+ format; \
+ MARK_JUMP_CALL_PROTOTYPE(name); \
+ MARK_JUMP_SELECT_DECLARE(name); \
+ MARK_DO_JUMP(name); \
+ MARK_JUMP_CALL(name, format, ## args); \
+over_label: \
+ do {} while(0); \
+ } while(0)
+#else
+#define MARK_JUMP(name, format, args...) \
+ (void) (__mark_inline_##name(format, ## args))
+#endif
+
+#define MARK(name, format, args...) \
+ do { \
+ __mark_check_format(format, ## args); \
+ MARK_SYM(name, format, ## args); \
+ MARK_JUMP(name, format, ## args); \
+ } while(0)
+
+typedef asmlinkage void marker_probe_func(const char *fmt, ...);
+
+static inline __attribute__ ((format (printf, 1, 2)))
+void __mark_check_format(const char *fmt, ...)
+{ }
+
+extern marker_probe_func __mark_empty_function;
+
+int marker_set_probe(const char *name, const char *format,
+ marker_probe_func *probe);
+
+void marker_disable_probe(const char *name, marker_probe_func *probe);
--- /dev/null
+++ b/kernel/Kconfig.marker
@@ -0,0 +1,25 @@
+# Code markers configuration
+
+menu "Marker configuration"
+
+
+config MARK_SYMBOL
+ bool "Replace markers with symbols"
+ default n
+ help
+ Put symbols in place of markers, useful for kprobe.
+
+config MARK_JUMP_CALL
+ bool "Replace markers with a jump over an inactive function call"
+ default n
+ help
+ Put a jump over a call in place of markers.
+
+config MARK_JUMP
+ bool "Jump marker probes set/disable infrastructure"
+ select KALLSYMS
+ default n
+ help
+ Install or remove probes from markers.
+
+endmenu
index 6844e18..1a01e5d 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -42,6 +42,7 @@ obj-$(CONFIG_GENERIC_HARDIRQS) += irq/
obj-$(CONFIG_SECCOMP) += seccomp.o
obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
obj-$(CONFIG_RELAY) += relay.o
+obj-$(CONFIG_MARK_JUMP) += marker.o
ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y)
# According to Alan Modra <[email protected]>, the -fno-omit-frame-pointer is
--- /dev/null
+++ b/kernel/marker.c
@@ -0,0 +1,161 @@
+/*****************************************************************************
+ * marker.c
+ *
+ * Code markup for dynamic and static tracing. Marker control module.
+ *
+ * (C) Copyright 2006 Mathieu Desnoyers <[email protected]>
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ *
+ * Design :
+ * kernel/marker.c deals with all marker activation from a centralized,
+ * coherent mechanism. The functions that will be called will simply sit in
+ * modules.
+ *
+ * Before activating a probe, the marker module :
+ * 1 - takes proper locking
+ * 2 - verifies that the function pointer and jmp target are at their default
+ * values, otherwise the "set" operation fails.
+ * 4 - does function pointer and jump setup.
+ *
+ * Setting them back to disabled is :
+ * 1 - setting back the default jmp and call values
+ * 2 - call synchronize_sched()
+ *
+ * A probe module must call marker disable on all its markers before module
+ * unload.
+ */
+
+
+#include <linux/marker.h>
+#include <linux/spinlock.h>
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+#include <linux/string.h>
+
+static DEFINE_SPINLOCK(marker_lock);
+
+struct marker_pointers {
+ void **call;
+ void **jmpselect;
+ void **jmpcall;
+ void **jmpinline;
+ void **jmpover;
+ void **format;
+};
+
+asmlinkage void __mark_empty_function(const char *fmt, ...)
+{
+}
+EXPORT_SYMBOL(__mark_empty_function);
+
+/* Pointers can be used around preemption disabled */
+static int marker_get_pointers(const char *name,
+ struct marker_pointers *ptrs)
+{
+ char call_sym[KSYM_NAME_LEN] = MARK_CALL_PREFIX;
+ char jmpselect_sym[KSYM_NAME_LEN] = MARK_JUMP_SELECT_PREFIX;
+ char jmpcall_sym[KSYM_NAME_LEN] = MARK_JUMP_CALL_PREFIX;
+ char jmpover_sym[KSYM_NAME_LEN] = MARK_JUMP_OVER_PREFIX;
+ char format_sym[KSYM_NAME_LEN] = MARK_FORMAT_PREFIX;
+ unsigned int call_sym_len = sizeof(MARK_CALL_PREFIX);
+ unsigned int jmpselect_sym_len = sizeof(MARK_JUMP_SELECT_PREFIX);
+ unsigned int jmpcall_sym_len = sizeof(MARK_JUMP_CALL_PREFIX);
+ unsigned int jmpover_sym_len = sizeof(MARK_JUMP_OVER_PREFIX);
+ unsigned int format_sym_len = sizeof(MARK_FORMAT_PREFIX);
+
+ strncat(call_sym, name, KSYM_NAME_LEN-call_sym_len);
+ strncat(jmpselect_sym, name, KSYM_NAME_LEN-jmpselect_sym_len);
+ strncat(jmpcall_sym, name, KSYM_NAME_LEN-jmpcall_sym_len);
+ strncat(jmpover_sym, name, KSYM_NAME_LEN-jmpover_sym_len);
+ strncat(format_sym, name, KSYM_NAME_LEN-format_sym_len);
+
+ ptrs->call = (void**)kallsyms_lookup_name(call_sym);
+ ptrs->jmpselect = (void**)kallsyms_lookup_name(jmpselect_sym);
+ ptrs->jmpcall = (void**)kallsyms_lookup_name(jmpcall_sym);
+ ptrs->jmpover = (void**)kallsyms_lookup_name(jmpover_sym);
+ ptrs->format = (void**)kallsyms_lookup_name(format_sym);
+
+ if (!(ptrs->call && ptrs->jmpselect && ptrs->jmpcall
+ && ptrs->jmpover && ptrs->format)) {
+ return ENOENT;
+ }
+ return 0;
+}
+
+int marker_set_probe(const char *name, const char *format,
+ marker_probe_func *probe)
+{
+ int result = 0;
+ struct marker_pointers ptrs;
+
+ spin_lock(&marker_lock);
+ result = marker_get_pointers(name, &ptrs);
+ if (result) {
+ result = ENODEV;
+ printk(KERN_NOTICE
+ "Unable to find kallsyms for markers in %s\n",
+ name);
+ goto unlock;
+ }
+
+ if (*ptrs.call != __mark_empty_function) {
+ result = EBUSY;
+ printk(KERN_NOTICE
+ "Probe already installed on "
+ "marker in %s\n",
+ name);
+ goto unlock;
+ }
+ /* Check the types if format provided by probe */
+ if (format && strncmp(format, *ptrs.format,
+ MARK_MAX_FORMAT_LEN)) {
+ result = EPERM;
+ printk(KERN_NOTICE
+ "Format mismatch for probe %s "
+ "(%s), marker (%s)\n",
+ name,
+ format,
+ (const char*)*ptrs.format);
+ goto unlock;
+ }
+ /* Setup the call pointer */
+ *ptrs.call = probe;
+ /* Setup the jump */
+#ifndef ARCH_HAS_MARK_NEAR_JUMP
+ *ptrs.jmpselect = *ptrs.jmpcall;
+#else
+ **(char**)ptrs.jmpselect = 0;
+#endif
+unlock:
+ spin_unlock(&marker_lock);
+ return result;
+}
+EXPORT_SYMBOL_GPL(marker_set_probe);
+
+void marker_disable_probe(const char *name, marker_probe_func *probe)
+{
+ int result = 0;
+ struct marker_pointers ptrs;
+
+ spin_lock(&marker_lock);
+ result = marker_get_pointers(name, &ptrs);
+ if (result)
+ goto unlock;
+
+ if (*ptrs.call == probe) {
+#ifndef ARCH_HAS_MARK_NEAR_JUMP
+ *ptrs.jmpselect = *ptrs.jmpover;
+#else
+ **(char**)ptrs.jmpselect =
+ *ptrs.jmpover - *ptrs.jmpcall;
+#endif
+ *ptrs.call = __mark_empty_function;
+ }
+unlock:
+ spin_unlock(&marker_lock);
+ if (!result)
+ synchronize_sched();
+}
+EXPORT_SYMBOL_GPL(marker_disable_probe);
---END---
---BEGIN---
/* probe.c
*
* Loads a function at a marker call site.
*
* (C) Copyright 2006 Mathieu Desnoyers <[email protected]>
*
* This file is released under the GPLv2.
* See the file COPYING for more details.
*/
#include <linux/marker.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
/* function to install */
#define DO_MARK1_FORMAT "%d"
asmlinkage void do_mark1(const char *format, int value)
{
__mark_check_format(DO_MARK1_FORMAT, value);
printk("value is %d\n", value);
}
#define DO_MARK2_FORMAT "%d %s"
asmlinkage void do_mark2(const char *format, int value, const char *string)
{
__mark_check_format(DO_MARK2_FORMAT, value, string);
printk("value is %d %s\n", value, string);
}
#define DO_MARK3_FORMAT "%d %s %s"
asmlinkage void do_mark3(const char *format, int value, const char *s1,
const char *s2)
{
__mark_check_format(DO_MARK3_FORMAT, value, s1, s2);
printk("value is %d %s %s\n", value, s1, s2);
}
int init_module(void)
{
int result;
result = marker_set_probe("subsys_mark1", DO_MARK1_FORMAT,
(marker_probe_func*)do_mark1);
if(result) goto end;
result = marker_set_probe("subsys_mark2", DO_MARK2_FORMAT,
(marker_probe_func*)do_mark2);
if(result) goto cleanup1;
result = marker_set_probe("subsys_mark3", DO_MARK3_FORMAT,
(marker_probe_func*)do_mark3);
if(result) goto cleanup2;
return -result;
cleanup2:
marker_disable_probe("subsys_mark2", (marker_probe_func*)do_mark2);
cleanup1:
marker_disable_probe("subsys_mark1", (marker_probe_func*)do_mark1);
end:
return -result;
}
void cleanup_module(void)
{
marker_disable_probe("subsys_mark1", (marker_probe_func*)do_mark1);
marker_disable_probe("subsys_mark2", (marker_probe_func*)do_mark2);
marker_disable_probe("subsys_mark3", (marker_probe_func*)do_mark3);
}
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mathieu Desnoyers");
MODULE_DESCRIPTION("Probe");
---END---
---BEGIN---
/* test-mark.c
*
*/
#include <linux/marker.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/sched.h>
volatile int x=7;
struct proc_dir_entry *pentry = NULL;
static int my_open(struct inode *inode, struct file *file)
{
unsigned int i;
for(i=0; i<2; i++) {
MARK(subsys_mark1, "%d", 1);
x=i;
barrier();
}
MARK(subsys_mark2, "%d %s", 2, "blah2");
MARK(subsys_mark3, "%d %s %s", x, "blah3", "blah5");
return -EPERM;
}
static struct file_operations my_operations = {
.open = my_open,
};
int init_module(void)
{
pentry = create_proc_entry("testmark", 0444, NULL);
if (pentry)
pentry->proc_fops = &my_operations;
return 0;
}
void cleanup_module(void)
{
remove_proc_entry("testmark", NULL);
}
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mathieu Desnoyers");
MODULE_DESCRIPTION("Marker Test");
---END---
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