Pileus Git - ~andy/linux/blob - kernel/trace/trace_event_profile.c

   1 /*
   2  * trace event based perf counter profiling
   3  *
   4  * Copyright (C) 2009 Red Hat Inc, Peter Zijlstra <pzijlstr@redhat.com>
   5  *
   6  */
   7
   8 #include <linux/module.h>
   9 #include "trace.h"
  10
  11 int ftrace_profile_enable(int event_id)
  12 {
  13         struct ftrace_event_call *event;
  14         int ret = -EINVAL;
  15
  16         mutex_lock(&event_mutex);
  17         list_for_each_entry(event, &ftrace_events, list) {
  18                 if (event->id == event_id && event->profile_enable &&
  19                     try_module_get(event->mod)) {
  20                         ret = event->profile_enable(event);
  21                         break;
  22                 }
  23         }
  24         mutex_unlock(&event_mutex);
  25
  26         return ret;
  27 }
  28
  29 void ftrace_profile_disable(int event_id)
  30 {
  31         struct ftrace_event_call *event;
  32
  33         mutex_lock(&event_mutex);
  34         list_for_each_entry(event, &ftrace_events, list) {
  35                 if (event->id == event_id) {
  36                         event->profile_disable(event);
  37                         module_put(event->mod);
  38                         break;
  39                 }
  40         }
  41         mutex_unlock(&event_mutex);
  42 }