tools/lib/traceevent/plugin_jbd2.c

   1 /*
   2  * Copyright (C) 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
   3  *
   4  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation;
   8  * version 2.1 of the License (not later!)
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this program; if not,  see <http://www.gnu.org/licenses>
  17  *
  18  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  19  */
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23
  24 #include "event-parse.h"
  25
  26 #define MINORBITS       20
  27 #define MINORMASK       ((1U << MINORBITS) - 1)
  28
  29 #define MAJOR(dev)      ((unsigned int) ((dev) >> MINORBITS))
  30 #define MINOR(dev)      ((unsigned int) ((dev) & MINORMASK))
  31
  32 static unsigned long long
  33 process_jbd2_dev_to_name(struct trace_seq *s,
  34                          unsigned long long *args)
  35 {
  36         unsigned int dev = args[0];
  37
  38         trace_seq_printf(s, "%d:%d", MAJOR(dev), MINOR(dev));
  39         return 0;
  40 }
  41
  42 static unsigned long long
  43 process_jiffies_to_msecs(struct trace_seq *s,
  44                          unsigned long long *args)
  45 {
  46         unsigned long long jiffies = args[0];
  47
  48         trace_seq_printf(s, "%lld", jiffies);
  49         return jiffies;
  50 }
  51
  52 int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
  53 {
  54         pevent_register_print_function(pevent,
  55                                        process_jbd2_dev_to_name,
  56                                        PEVENT_FUNC_ARG_STRING,
  57                                        "jbd2_dev_to_name",
  58                                        PEVENT_FUNC_ARG_INT,
  59                                        PEVENT_FUNC_ARG_VOID);
  60
  61         pevent_register_print_function(pevent,
  62                                        process_jiffies_to_msecs,
  63                                        PEVENT_FUNC_ARG_LONG,
  64                                        "jiffies_to_msecs",
  65                                        PEVENT_FUNC_ARG_LONG,
  66                                        PEVENT_FUNC_ARG_VOID);
  67         return 0;
  68 }
  69
  70 void PEVENT_PLUGIN_UNLOADER(struct pevent *pevent)
  71 {
  72         pevent_unregister_print_function(pevent, process_jbd2_dev_to_name,
  73                                          "jbd2_dev_to_name");
  74
  75         pevent_unregister_print_function(pevent, process_jiffies_to_msecs,
  76                                          "jiffies_to_msecs");
  77 }