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/*
* trace event based perf counter profiling
*
* Copyright (C) 2009 Red Hat Inc, Peter Zijlstra <pzijlstr@redhat.com>
*
*/
#include <linux/module.h>
#include "trace.h"
static int ftrace_profile_enable_event(struct ftrace_event_call *event)
{
if (atomic_inc_return(&event->profile_count))
return 0;
return event->profile_enable();
}
int ftrace_profile_enable(int event_id)
{
struct ftrace_event_call *event;
int ret = -EINVAL;
mutex_lock(&event_mutex);
list_for_each_entry(event, &ftrace_events, list) {
if (event->id == event_id && event->profile_enable &&
try_module_get(event->mod)) {
ret = ftrace_profile_enable_event(event);
break;
}
}
mutex_unlock(&event_mutex);
return ret;
}
static void ftrace_profile_disable_event(struct ftrace_event_call *event)
{
if (!atomic_add_negative(-1, &event->profile_count))
return;
event->profile_disable();
}
void ftrace_profile_disable(int event_id)
{
struct ftrace_event_call *event;
mutex_lock(&event_mutex);
list_for_each_entry(event, &ftrace_events, list) {
if (event->id == event_id) {
ftrace_profile_disable_event(event);
module_put(event->mod);
break;
}
}
mutex_unlock(&event_mutex);
}
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