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ftrace: add pretty print function for traceon and traceoff hooks

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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: Steven Rostedt <srostedt@redhat.com>
This commit is contained in:
Steven Rostedt 2009-02-16 23:38:13 -05:00
parent 809dcf29ce
commit e110e3d1ea
1 changed files with 28 additions and 0 deletions
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28
kernel/trace/trace_functions.c
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@ -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)
{