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 #include "trace-seq.h"
  26
  27 #define MINORBITS       20
  28 #define MINORMASK       ((1U << MINORBITS) - 1)
  29
  30 #define MAJOR(dev)      ((unsigned int) ((dev) >> MINORBITS))
  31 #define MINOR(dev)      ((unsigned int) ((dev) & MINORMASK))
  32
  33 static unsigned long long
  34 process_jbd2_dev_to_name(struct trace_seq *s, 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, unsigned long long *args)
  44 {
  45         unsigned long long jiffies = args[0];
  46
  47         trace_seq_printf(s, "%lld", jiffies);
  48         return jiffies;
  49 }
  50
  51 int TEP_PLUGIN_LOADER(struct tep_handle *pevent)
  52 {
  53         tep_register_print_function(pevent,
  54                                     process_jbd2_dev_to_name,
  55                                     TEP_FUNC_ARG_STRING,
  56                                     "jbd2_dev_to_name",
  57                                     TEP_FUNC_ARG_INT,
  58                                     TEP_FUNC_ARG_VOID);
  59
  60         tep_register_print_function(pevent,
  61                                     process_jiffies_to_msecs,
  62                                     TEP_FUNC_ARG_LONG,
  63                                     "jiffies_to_msecs",
  64                                     TEP_FUNC_ARG_LONG,
  65                                     TEP_FUNC_ARG_VOID);
  66         return 0;
  67 }
  68
  69 void TEP_PLUGIN_UNLOADER(struct tep_handle *pevent)
  70 {
  71         tep_unregister_print_function(pevent, process_jbd2_dev_to_name,
  72                                       "jbd2_dev_to_name");
  73
  74         tep_unregister_print_function(pevent, process_jiffies_to_msecs,
  75                                       "jiffies_to_msecs");
  76 }