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ftrace: Separate unlimited probes from count limited probes 

The function tracing probes that trigger traceon or traceoff can be
set to unlimited, or given a count of # of times to execute.

By separating these two types of probes, we can then use the dynamic
ftrace function filtering directly, and remove the brute force
"check if this function called is my probe" routines in ftrace.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2013-03-09 08:56:43 -05:00 committed by Steven Rostedt
parent 8b8fa62c60
commit 8380d24860
1 changed files with 33 additions and 5 deletions
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38
kernel/trace/trace_functions.c
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@ -228,7 +228,7 @@ static int update_count(void **data)
}
static void
ftrace_traceon(unsigned long ip, unsigned long parent_ip, void **data)
ftrace_traceon_count(unsigned long ip, unsigned long parent_ip, void **data)
{
if (tracing_is_on())
return;
@ -238,7 +238,7 @@ ftrace_traceon(unsigned long ip, unsigned long parent_ip, void **data)
}
static void
ftrace_traceoff(unsigned long ip, unsigned long parent_ip, void **data)
ftrace_traceoff_count(unsigned long ip, unsigned long parent_ip, void **data)
{
if (!tracing_is_on())
return;
@ -247,10 +247,38 @@ ftrace_traceoff(unsigned long ip, unsigned long parent_ip, void **data)
tracing_off();
}
static void
ftrace_traceon(unsigned long ip, unsigned long parent_ip, void **data)
{
if (tracing_is_on())
return;
tracing_on();
}
static void
ftrace_traceoff(unsigned long ip, unsigned long parent_ip, void **data)
{
if (!tracing_is_on())
return;
tracing_off();
}
static int
ftrace_trace_onoff_print(struct seq_file *m, unsigned long ip,
struct ftrace_probe_ops *ops, void *data);
static struct ftrace_probe_ops traceon_count_probe_ops = {
.func = ftrace_traceon_count,
.print = ftrace_trace_onoff_print,
};
static struct ftrace_probe_ops traceoff_count_probe_ops = {
.func = ftrace_traceoff_count,
.print = ftrace_trace_onoff_print,
};
static struct ftrace_probe_ops traceon_probe_ops = {
.func = ftrace_traceon,
.print = ftrace_trace_onoff_print,
@ -269,7 +297,7 @@ ftrace_trace_onoff_print(struct seq_file *m, unsigned long ip,
seq_printf(m, "%ps:", (void *)ip);
if (ops == &traceon_probe_ops)
if (ops == &traceon_probe_ops || ops == &traceon_count_probe_ops)
seq_printf(m, "traceon");
else
seq_printf(m, "traceoff");
@ -297,9 +325,9 @@ ftrace_trace_onoff_callback(struct ftrace_hash *hash,
/* we register both traceon and traceoff to this callback */
if (strcmp(cmd, "traceon") == 0)
ops = &traceon_probe_ops;
ops = param ? &traceon_count_probe_ops : &traceon_probe_ops;
else
ops = &traceoff_probe_ops;
ops = param ? &traceoff_count_probe_ops : &traceoff_probe_ops;
if (glob[0] == '!') {
unregister_ftrace_function_probe_func(glob+1, ops);