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Commit e110e3d1 authored by Steven Rostedt's avatar Steven Rostedt
Browse files

ftrace: add pretty print function for traceon and traceoff hooks 



This patch adds a pretty print version of traceon and traceoff
output for set_ftrace_filter.

  # echo 'sys_open:traceon:4' > set_ftrace_filter
  # cat set_ftrace_filter

 #### all functions enabled ####
 sys_open:traceon:count=4

Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
parent 809dcf29

kernel/trace/trace_functions.c

+28 −0
Original line number Diff line number Diff line
@@ -267,14 +267,42 @@ ftrace_traceoff(unsigned long ip, unsigned long parent_ip, void **data) 
	tracing_off();

}



static int

ftrace_trace_onoff_print(struct seq_file *m, unsigned long ip,

			 struct ftrace_hook_ops *ops, void *data);



static struct ftrace_hook_ops traceon_hook_ops = {

	.func			= ftrace_traceon,

	.print			= ftrace_trace_onoff_print,

};



static struct ftrace_hook_ops traceoff_hook_ops = {

	.func			= ftrace_traceoff,

	.print			= ftrace_trace_onoff_print,

};



static int

ftrace_trace_onoff_print(struct seq_file *m, unsigned long ip,

			 struct ftrace_hook_ops *ops, void *data)

{

	char str[KSYM_SYMBOL_LEN];

	long count = (long)data;



	kallsyms_lookup(ip, NULL, NULL, NULL, str);

	seq_printf(m, "%s:", str);



	if (ops == &traceon_hook_ops)

		seq_printf(m, "traceon");

	else

		seq_printf(m, "traceoff");



	if (count != -1)

		seq_printf(m, ":count=%ld", count);

	seq_putc(m, '\n');



	return 0;

}



static int

ftrace_trace_onoff_unreg(char *glob, char *cmd, char *param)

{