tracing: Add ftrace_graph_notrace boot parameter
The ftrace_graph_notrace option is for specifying notrace filter for function graph tracer at boot time. It can be altered after boot using set_graph_notrace file on the debugfs. Link: http://lkml.kernel.org/p/1402590233-22321-2-git-send-email-namhyung@kernel.org Signed-off-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
parent
3448bac329
commit
0d7d9a16ce
|
@ -1097,6 +1097,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
|
||||||
that can be changed at run time by the
|
that can be changed at run time by the
|
||||||
set_graph_function file in the debugfs tracing directory.
|
set_graph_function file in the debugfs tracing directory.
|
||||||
|
|
||||||
|
ftrace_graph_notrace=[function-list]
|
||||||
|
[FTRACE] Do not trace from the functions specified in
|
||||||
|
function-list. This list is a comma separated list of
|
||||||
|
functions that can be changed at run time by the
|
||||||
|
set_graph_notrace file in the debugfs tracing directory.
|
||||||
|
|
||||||
gamecon.map[2|3]=
|
gamecon.map[2|3]=
|
||||||
[HW,JOY] Multisystem joystick and NES/SNES/PSX pad
|
[HW,JOY] Multisystem joystick and NES/SNES/PSX pad
|
||||||
support via parallel port (up to 5 devices per port)
|
support via parallel port (up to 5 devices per port)
|
||||||
|
|
|
@ -3884,6 +3884,7 @@ __setup("ftrace_filter=", set_ftrace_filter);
|
||||||
|
|
||||||
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
||||||
static char ftrace_graph_buf[FTRACE_FILTER_SIZE] __initdata;
|
static char ftrace_graph_buf[FTRACE_FILTER_SIZE] __initdata;
|
||||||
|
static char ftrace_graph_notrace_buf[FTRACE_FILTER_SIZE] __initdata;
|
||||||
static int ftrace_set_func(unsigned long *array, int *idx, int size, char *buffer);
|
static int ftrace_set_func(unsigned long *array, int *idx, int size, char *buffer);
|
||||||
|
|
||||||
static int __init set_graph_function(char *str)
|
static int __init set_graph_function(char *str)
|
||||||
|
@ -3893,16 +3894,29 @@ static int __init set_graph_function(char *str)
|
||||||
}
|
}
|
||||||
__setup("ftrace_graph_filter=", set_graph_function);
|
__setup("ftrace_graph_filter=", set_graph_function);
|
||||||
|
|
||||||
static void __init set_ftrace_early_graph(char *buf)
|
static int __init set_graph_notrace_function(char *str)
|
||||||
|
{
|
||||||
|
strlcpy(ftrace_graph_notrace_buf, str, FTRACE_FILTER_SIZE);
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
__setup("ftrace_graph_notrace=", set_graph_notrace_function);
|
||||||
|
|
||||||
|
static void __init set_ftrace_early_graph(char *buf, int enable)
|
||||||
{
|
{
|
||||||
int ret;
|
int ret;
|
||||||
char *func;
|
char *func;
|
||||||
|
unsigned long *table = ftrace_graph_funcs;
|
||||||
|
int *count = &ftrace_graph_count;
|
||||||
|
|
||||||
|
if (!enable) {
|
||||||
|
table = ftrace_graph_notrace_funcs;
|
||||||
|
count = &ftrace_graph_notrace_count;
|
||||||
|
}
|
||||||
|
|
||||||
while (buf) {
|
while (buf) {
|
||||||
func = strsep(&buf, ",");
|
func = strsep(&buf, ",");
|
||||||
/* we allow only one expression at a time */
|
/* we allow only one expression at a time */
|
||||||
ret = ftrace_set_func(ftrace_graph_funcs, &ftrace_graph_count,
|
ret = ftrace_set_func(table, count, FTRACE_GRAPH_MAX_FUNCS, func);
|
||||||
FTRACE_GRAPH_MAX_FUNCS, func);
|
|
||||||
if (ret)
|
if (ret)
|
||||||
printk(KERN_DEBUG "ftrace: function %s not "
|
printk(KERN_DEBUG "ftrace: function %s not "
|
||||||
"traceable\n", func);
|
"traceable\n", func);
|
||||||
|
@ -3931,7 +3945,9 @@ static void __init set_ftrace_early_filters(void)
|
||||||
ftrace_set_early_filter(&global_ops, ftrace_notrace_buf, 0);
|
ftrace_set_early_filter(&global_ops, ftrace_notrace_buf, 0);
|
||||||
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
||||||
if (ftrace_graph_buf[0])
|
if (ftrace_graph_buf[0])
|
||||||
set_ftrace_early_graph(ftrace_graph_buf);
|
set_ftrace_early_graph(ftrace_graph_buf, 1);
|
||||||
|
if (ftrace_graph_notrace_buf[0])
|
||||||
|
set_ftrace_early_graph(ftrace_graph_notrace_buf, 0);
|
||||||
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
Loading…
Reference in a new issue