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 "trace.h"
   9
  10 int ftrace_profile_enable(int event_id)
  11 {
  12         struct ftrace_event_call *event;
  13         int ret = -EINVAL;
  14
  15         mutex_lock(&event_mutex);
  16         list_for_each_entry(event, &ftrace_events, list) {
  17                 if (event->id == event_id && event->profile_enable) {
  18                         ret = event->profile_enable(event);
  19                         break;
  20                 }
  21         }
  22         mutex_unlock(&event_mutex);
  23
  24         return ret;
  25 }
  26
  27 void ftrace_profile_disable(int event_id)
  28 {
  29         struct ftrace_event_call *event;
  30
  31         mutex_lock(&event_mutex);
  32         list_for_each_entry(event, &ftrace_events, list) {
  33                 if (event->id == event_id) {
  34                         event->profile_disable(event);
  35                         break;
  36                 }
  37         }
  38         mutex_unlock(&event_mutex);
  39 }