tools/lib/traceevent/plugins/plugin_tlb.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  * Copyright (C) 2015 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
  11 enum tlb_flush_reason {
  12         TLB_FLUSH_ON_TASK_SWITCH,
  13         TLB_REMOTE_SHOOTDOWN,
  14         TLB_LOCAL_SHOOTDOWN,
  15         TLB_LOCAL_MM_SHOOTDOWN,
  16         NR_TLB_FLUSH_REASONS,
  17 };
  18
  19 static int tlb_flush_handler(struct trace_seq *s, struct tep_record *record,
  20                              struct tep_event *event, void *context)
  21 {
  22         unsigned long long val;
  23
  24         trace_seq_printf(s, "pages=");
  25
  26         tep_print_num_field(s, "%ld", event, "pages", record, 1);
  27
  28         if (tep_get_field_val(s, event, "reason", record, &val, 1) < 0)
  29                 return -1;
  30
  31         trace_seq_puts(s, " reason=");
  32
  33         switch (val) {
  34         case TLB_FLUSH_ON_TASK_SWITCH:
  35                 trace_seq_puts(s, "flush on task switch");
  36                 break;
  37         case TLB_REMOTE_SHOOTDOWN:
  38                 trace_seq_puts(s, "remote shootdown");
  39                 break;
  40         case TLB_LOCAL_SHOOTDOWN:
  41                 trace_seq_puts(s, "local shootdown");
  42                 break;
  43         case TLB_LOCAL_MM_SHOOTDOWN:
  44                 trace_seq_puts(s, "local mm shootdown");
  45                 break;
  46         }
  47
  48         trace_seq_printf(s, " (%lld)", val);
  49
  50         return 0;
  51 }
  52
  53 int TEP_PLUGIN_LOADER(struct tep_handle *tep)
  54 {
  55         tep_register_event_handler(tep, -1, "tlb", "tlb_flush",
  56                                    tlb_flush_handler, NULL);
  57
  58         return 0;
  59 }
  60
  61 void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
  62 {
  63         tep_unregister_event_handler(tep, -1,
  64                                      "tlb", "tlb_flush",
  65                                      tlb_flush_handler, NULL);
  66 }