mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 10:40:15 +02:00
ftrace: Add self-tests for multiple function trace users
Add some basic sanity tests for multiple users of the function tracer at startup. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt
Steven Rostedt
parent
936e074b28
commit
95950c2ecb
3 changed files with 217 additions and 1 deletions
|
|
@ -419,6 +419,8 @@ extern void trace_find_cmdline(int pid, char comm[]);
|
|||
extern unsigned long ftrace_update_tot_cnt;
|
||||
#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
|
||||
extern int DYN_FTRACE_TEST_NAME(void);
|
||||
#define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
|
||||
extern int DYN_FTRACE_TEST_NAME2(void);
|
||||
#endif
|
||||
|
||||
extern int ring_buffer_expanded;
|
||||
|
|
|
|||
|
|
@ -101,6 +101,206 @@ static inline void warn_failed_init_tracer(struct tracer *trace, int init_ret)
|
|||
|
||||
#ifdef CONFIG_DYNAMIC_FTRACE
|
||||
|
||||
static int trace_selftest_test_probe1_cnt;
|
||||
static void trace_selftest_test_probe1_func(unsigned long ip,
|
||||
unsigned long pip)
|
||||
{
|
||||
trace_selftest_test_probe1_cnt++;
|
||||
}
|
||||
|
||||
static int trace_selftest_test_probe2_cnt;
|
||||
static void trace_selftest_test_probe2_func(unsigned long ip,
|
||||
unsigned long pip)
|
||||
{
|
||||
trace_selftest_test_probe2_cnt++;
|
||||
}
|
||||
|
||||
static int trace_selftest_test_probe3_cnt;
|
||||
static void trace_selftest_test_probe3_func(unsigned long ip,
|
||||
unsigned long pip)
|
||||
{
|
||||
trace_selftest_test_probe3_cnt++;
|
||||
}
|
||||
|
||||
static int trace_selftest_test_global_cnt;
|
||||
static void trace_selftest_test_global_func(unsigned long ip,
|
||||
unsigned long pip)
|
||||
{
|
||||
trace_selftest_test_global_cnt++;
|
||||
}
|
||||
|
||||
static int trace_selftest_test_dyn_cnt;
|
||||
static void trace_selftest_test_dyn_func(unsigned long ip,
|
||||
unsigned long pip)
|
||||
{
|
||||
trace_selftest_test_dyn_cnt++;
|
||||
}
|
||||
|
||||
static struct ftrace_ops test_probe1 = {
|
||||
.func = trace_selftest_test_probe1_func,
|
||||
};
|
||||
|
||||
static struct ftrace_ops test_probe2 = {
|
||||
.func = trace_selftest_test_probe2_func,
|
||||
};
|
||||
|
||||
static struct ftrace_ops test_probe3 = {
|
||||
.func = trace_selftest_test_probe3_func,
|
||||
};
|
||||
|
||||
static struct ftrace_ops test_global = {
|
||||
.func = trace_selftest_test_global_func,
|
||||
.flags = FTRACE_OPS_FL_GLOBAL,
|
||||
};
|
||||
|
||||
static void print_counts(void)
|
||||
{
|
||||
printk("(%d %d %d %d %d) ",
|
||||
trace_selftest_test_probe1_cnt,
|
||||
trace_selftest_test_probe2_cnt,
|
||||
trace_selftest_test_probe3_cnt,
|
||||
trace_selftest_test_global_cnt,
|
||||
trace_selftest_test_dyn_cnt);
|
||||
}
|
||||
|
||||
static void reset_counts(void)
|
||||
{
|
||||
trace_selftest_test_probe1_cnt = 0;
|
||||
trace_selftest_test_probe2_cnt = 0;
|
||||
trace_selftest_test_probe3_cnt = 0;
|
||||
trace_selftest_test_global_cnt = 0;
|
||||
trace_selftest_test_dyn_cnt = 0;
|
||||
}
|
||||
|
||||
static int trace_selftest_ops(int cnt)
|
||||
{
|
||||
int save_ftrace_enabled = ftrace_enabled;
|
||||
struct ftrace_ops *dyn_ops;
|
||||
char *func1_name;
|
||||
char *func2_name;
|
||||
int len1;
|
||||
int len2;
|
||||
int ret = -1;
|
||||
|
||||
printk(KERN_CONT "PASSED\n");
|
||||
pr_info("Testing dynamic ftrace ops #%d: ", cnt);
|
||||
|
||||
ftrace_enabled = 1;
|
||||
reset_counts();
|
||||
|
||||
/* Handle PPC64 '.' name */
|
||||
func1_name = "*" __stringify(DYN_FTRACE_TEST_NAME);
|
||||
func2_name = "*" __stringify(DYN_FTRACE_TEST_NAME2);
|
||||
len1 = strlen(func1_name);
|
||||
len2 = strlen(func2_name);
|
||||
|
||||
/*
|
||||
* Probe 1 will trace function 1.
|
||||
* Probe 2 will trace function 2.
|
||||
* Probe 3 will trace functions 1 and 2.
|
||||
*/
|
||||
ftrace_set_filter(&test_probe1, func1_name, len1, 1);
|
||||
ftrace_set_filter(&test_probe2, func2_name, len2, 1);
|
||||
ftrace_set_filter(&test_probe3, func1_name, len1, 1);
|
||||
ftrace_set_filter(&test_probe3, func2_name, len2, 0);
|
||||
|
||||
register_ftrace_function(&test_probe1);
|
||||
register_ftrace_function(&test_probe2);
|
||||
register_ftrace_function(&test_probe3);
|
||||
register_ftrace_function(&test_global);
|
||||
|
||||
DYN_FTRACE_TEST_NAME();
|
||||
|
||||
print_counts();
|
||||
|
||||
if (trace_selftest_test_probe1_cnt != 1)
|
||||
goto out;
|
||||
if (trace_selftest_test_probe2_cnt != 0)
|
||||
goto out;
|
||||
if (trace_selftest_test_probe3_cnt != 1)
|
||||
goto out;
|
||||
if (trace_selftest_test_global_cnt == 0)
|
||||
goto out;
|
||||
|
||||
DYN_FTRACE_TEST_NAME2();
|
||||
|
||||
print_counts();
|
||||
|
||||
if (trace_selftest_test_probe1_cnt != 1)
|
||||
goto out;
|
||||
if (trace_selftest_test_probe2_cnt != 1)
|
||||
goto out;
|
||||
if (trace_selftest_test_probe3_cnt != 2)
|
||||
goto out;
|
||||
|
||||
/* Add a dynamic probe */
|
||||
dyn_ops = kzalloc(sizeof(*dyn_ops), GFP_KERNEL);
|
||||
if (!dyn_ops) {
|
||||
printk("MEMORY ERROR ");
|
||||
goto out;
|
||||
}
|
||||
|
||||
dyn_ops->func = trace_selftest_test_dyn_func;
|
||||
|
||||
register_ftrace_function(dyn_ops);
|
||||
|
||||
trace_selftest_test_global_cnt = 0;
|
||||
|
||||
DYN_FTRACE_TEST_NAME();
|
||||
|
||||
print_counts();
|
||||
|
||||
if (trace_selftest_test_probe1_cnt != 2)
|
||||
goto out_free;
|
||||
if (trace_selftest_test_probe2_cnt != 1)
|
||||
goto out_free;
|
||||
if (trace_selftest_test_probe3_cnt != 3)
|
||||
goto out_free;
|
||||
if (trace_selftest_test_global_cnt == 0)
|
||||
goto out;
|
||||
if (trace_selftest_test_dyn_cnt == 0)
|
||||
goto out_free;
|
||||
|
||||
DYN_FTRACE_TEST_NAME2();
|
||||
|
||||
print_counts();
|
||||
|
||||
if (trace_selftest_test_probe1_cnt != 2)
|
||||
goto out_free;
|
||||
if (trace_selftest_test_probe2_cnt != 2)
|
||||
goto out_free;
|
||||
if (trace_selftest_test_probe3_cnt != 4)
|
||||
goto out_free;
|
||||
|
||||
ret = 0;
|
||||
out_free:
|
||||
unregister_ftrace_function(dyn_ops);
|
||||
kfree(dyn_ops);
|
||||
|
||||
out:
|
||||
/* Purposely unregister in the same order */
|
||||
unregister_ftrace_function(&test_probe1);
|
||||
unregister_ftrace_function(&test_probe2);
|
||||
unregister_ftrace_function(&test_probe3);
|
||||
unregister_ftrace_function(&test_global);
|
||||
|
||||
/* Make sure everything is off */
|
||||
reset_counts();
|
||||
DYN_FTRACE_TEST_NAME();
|
||||
DYN_FTRACE_TEST_NAME();
|
||||
|
||||
if (trace_selftest_test_probe1_cnt ||
|
||||
trace_selftest_test_probe2_cnt ||
|
||||
trace_selftest_test_probe3_cnt ||
|
||||
trace_selftest_test_global_cnt ||
|
||||
trace_selftest_test_dyn_cnt)
|
||||
ret = -1;
|
||||
|
||||
ftrace_enabled = save_ftrace_enabled;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Test dynamic code modification and ftrace filters */
|
||||
int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
|
||||
struct trace_array *tr,
|
||||
|
|
@ -166,16 +366,20 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
|
|||
|
||||
/* check the trace buffer */
|
||||
ret = trace_test_buffer(tr, &count);
|
||||
trace->reset(tr);
|
||||
tracing_start();
|
||||
|
||||
/* we should only have one item */
|
||||
if (!ret && count != 1) {
|
||||
trace->reset(tr);
|
||||
printk(KERN_CONT ".. filter failed count=%ld ..", count);
|
||||
ret = -1;
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* Test the ops with global tracing running */
|
||||
ret = trace_selftest_ops(1);
|
||||
trace->reset(tr);
|
||||
|
||||
out:
|
||||
ftrace_enabled = save_ftrace_enabled;
|
||||
tracer_enabled = save_tracer_enabled;
|
||||
|
|
@ -183,6 +387,10 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
|
|||
/* Enable tracing on all functions again */
|
||||
ftrace_set_global_filter(NULL, 0, 1);
|
||||
|
||||
/* Test the ops with global tracing off */
|
||||
if (!ret)
|
||||
ret = trace_selftest_ops(2);
|
||||
|
||||
return ret;
|
||||
}
|
||||
#else
|
||||
|
|
|
|||
|
|
@ -5,3 +5,9 @@ int DYN_FTRACE_TEST_NAME(void)
|
|||
/* used to call mcount */
|
||||
return 0;
|
||||
}
|
||||
|
||||
int DYN_FTRACE_TEST_NAME2(void)
|
||||
{
|
||||
/* used to call mcount */
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue