server/ctdb_statistics.c

   1 /*
   2    ctdb statistics code
   3
   4    Copyright (C) Ronnie Sahlberg 2010
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include <string.h>
  22 #include "lib/tevent/tevent.h"
  23 #include "../include/ctdb_private.h"
  24
  25 static void ctdb_statistics_update(struct event_context *ev, struct timed_event *te,
  26                                    struct timeval t, void *p)
  27 {
  28         struct ctdb_context *ctdb = talloc_get_type(p, struct ctdb_context);
  29
  30         memmove(&ctdb->statistics_history[1], &ctdb->statistics_history[0], (MAX_STAT_HISTORY-1)*sizeof(struct ctdb_statistics));
  31         memcpy(&ctdb->statistics_history[0], &ctdb->statistics_current, sizeof(struct ctdb_statistics));
  32         ctdb->statistics_history[0].statistics_current_time = timeval_current();
  33
  34
  35         bzero(&ctdb->statistics_current, sizeof(struct ctdb_statistics));
  36         ctdb->statistics_current.statistics_start_time = timeval_current();
  37
  38
  39         event_add_timed(ctdb->ev, ctdb, timeval_current_ofs(ctdb->tunable.stat_history_interval, 0), ctdb_statistics_update, ctdb);
  40 }
  41
  42 int ctdb_statistics_init(struct ctdb_context *ctdb)
  43 {
  44         bzero(&ctdb->statistics, sizeof(struct ctdb_statistics));
  45
  46         bzero(&ctdb->statistics_current, sizeof(struct ctdb_statistics));
  47         ctdb->statistics_current.statistics_start_time = timeval_current();
  48
  49         bzero(ctdb->statistics_history, sizeof(ctdb->statistics_history));
  50
  51         event_add_timed(ctdb->ev, ctdb, timeval_current_ofs(ctdb->tunable.stat_history_interval, 0), ctdb_statistics_update, ctdb);
  52         return 0;
  53 }
  54
  55
  56 int32_t ctdb_control_get_stat_history(struct ctdb_context *ctdb,
  57                                       struct ctdb_req_control *c,
  58                                       TDB_DATA *outdata)
  59 {
  60         int len;
  61         struct ctdb_statistics_wire *stat;
  62
  63         len = offsetof(struct ctdb_statistics_wire, stats) + MAX_STAT_HISTORY*sizeof(struct ctdb_statistics);
  64
  65         stat = talloc_size(outdata, len);
  66         if (stat == NULL) {
  67                 DEBUG(DEBUG_ERR,(__location__ " Failed to allocate statistics history structure\n"));
  68                 return -1;
  69         }
  70
  71         stat->num = MAX_STAT_HISTORY;
  72         memcpy(&stat->stats[0], &ctdb->statistics_history[0], sizeof(ctdb->statistics_history));
  73
  74         outdata->dsize = len;
  75         outdata->dptr  = (uint8_t *)stat;
  76
  77         return 0;
  78 }