tools/lib/traceevent/plugins/plugin_jbd2.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  * Copyright (C) 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
   4  */
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8
   9 #include "event-parse.h"
  10 #include "trace-seq.h"
  11
  12 #define MINORBITS       20
  13 #define MINORMASK       ((1U << MINORBITS) - 1)
  14
  15 #define MAJOR(dev)      ((unsigned int) ((dev) >> MINORBITS))
  16 #define MINOR(dev)      ((unsigned int) ((dev) & MINORMASK))
  17
  18 static unsigned long long
  19 process_jbd2_dev_to_name(struct trace_seq *s, unsigned long long *args)
  20 {
  21         unsigned int dev = args[0];
  22
  23         trace_seq_printf(s, "%d:%d", MAJOR(dev), MINOR(dev));
  24         return 0;
  25 }
  26
  27 static unsigned long long
  28 process_jiffies_to_msecs(struct trace_seq *s, unsigned long long *args)
  29 {
  30         unsigned long long jiffies = args[0];
  31
  32         trace_seq_printf(s, "%lld", jiffies);
  33         return jiffies;
  34 }
  35
  36 int TEP_PLUGIN_LOADER(struct tep_handle *tep)
  37 {
  38         tep_register_print_function(tep,
  39                                     process_jbd2_dev_to_name,
  40                                     TEP_FUNC_ARG_STRING,
  41                                     "jbd2_dev_to_name",
  42                                     TEP_FUNC_ARG_INT,
  43                                     TEP_FUNC_ARG_VOID);
  44
  45         tep_register_print_function(tep,
  46                                     process_jiffies_to_msecs,
  47                                     TEP_FUNC_ARG_LONG,
  48                                     "jiffies_to_msecs",
  49                                     TEP_FUNC_ARG_LONG,
  50                                     TEP_FUNC_ARG_VOID);
  51         return 0;
  52 }
  53
  54 void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
  55 {
  56         tep_unregister_print_function(tep, process_jbd2_dev_to_name,
  57                                       "jbd2_dev_to_name");
  58
  59         tep_unregister_print_function(tep, process_jiffies_to_msecs,
  60                                       "jiffies_to_msecs");
  61 }