lttng-calibrate.c

   1 /*
   2  * lttng-calibrate.c
   3  *
   4  * LTTng probe calibration.
   5  *
   6  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; only
  11  * version 2.1 of the License.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include <lttng-abi.h>
  24 #include <lttng-events.h>
  25
  26 noinline
  27 void lttng_calibrate_kretprobe(void)
  28 {
  29         asm volatile ("");
  30 }
  31
  32 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate)
  33 {
  34         switch (calibrate->type) {
  35         case LTTNG_KERNEL_CALIBRATE_KRETPROBE:
  36                 lttng_calibrate_kretprobe();
  37                 break;
  38         default:
  39                 return -EINVAL;
  40         }
  41         return 0;
  42 }