kernel/tools/lib/traceevent/plugin_kmem.c

   1 /*
   2  * Copyright (C) 2009 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 static int call_site_handler(struct trace_seq *s, struct pevent_record *record,
  27                              struct event_format *event, void *context)
  28 {
  29         struct format_field *field;
  30         unsigned long long val, addr;
  31         void *data = record->data;
  32         const char *func;
  33
  34         field = pevent_find_field(event, "call_site");
  35         if (!field)
  36                 return 1;
  37
  38         if (pevent_read_number_field(field, data, &val))
  39                 return 1;
  40
  41         func = pevent_find_function(event->pevent, val);
  42         if (!func)
  43                 return 1;
  44
  45         addr = pevent_find_function_address(event->pevent, val);
  46
  47         trace_seq_printf(s, "(%s+0x%x) ", func, (int)(val - addr));
  48         return 1;
  49 }
  50
  51 int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
  52 {
  53         pevent_register_event_handler(pevent, -1, "kmem", "kfree",
  54                                       call_site_handler, NULL);
  55
  56         pevent_register_event_handler(pevent, -1, "kmem", "kmalloc",
  57                                       call_site_handler, NULL);
  58
  59         pevent_register_event_handler(pevent, -1, "kmem", "kmalloc_node",
  60                                       call_site_handler, NULL);
  61
  62         pevent_register_event_handler(pevent, -1, "kmem", "kmem_cache_alloc",
  63                                       call_site_handler, NULL);
  64
  65         pevent_register_event_handler(pevent, -1, "kmem",
  66                                       "kmem_cache_alloc_node",
  67                                       call_site_handler, NULL);
  68
  69         pevent_register_event_handler(pevent, -1, "kmem", "kmem_cache_free",
  70                                       call_site_handler, NULL);
  71         return 0;
  72 }
  73
  74 void PEVENT_PLUGIN_UNLOADER(struct pevent *pevent)
  75 {
  76         pevent_unregister_event_handler(pevent, -1, "kmem", "kfree",
  77                                         call_site_handler, NULL);
  78
  79         pevent_unregister_event_handler(pevent, -1, "kmem", "kmalloc",
  80                                         call_site_handler, NULL);
  81
  82         pevent_unregister_event_handler(pevent, -1, "kmem", "kmalloc_node",
  83                                         call_site_handler, NULL);
  84
  85         pevent_unregister_event_handler(pevent, -1, "kmem", "kmem_cache_alloc",
  86                                         call_site_handler, NULL);
  87
  88         pevent_unregister_event_handler(pevent, -1, "kmem",
  89                                         "kmem_cache_alloc_node",
  90                                         call_site_handler, NULL);
  91
  92         pevent_unregister_event_handler(pevent, -1, "kmem", "kmem_cache_free",
  93                                         call_site_handler, NULL);
  94 }