ctdb/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 "replace.h"
  21 #include "system/network.h"
  22 #include "system/time.h"
  23
  24 #include <talloc.h>
  25 #include <tevent.h>
  26
  27 #include "lib/util/debug.h"
  28 #include "lib/util/samba_util.h"
  29
  30 #include "ctdb_private.h"
  31
  32 #include "common/logging.h"
  33
  34 static void ctdb_statistics_update(struct tevent_context *ev,
  35                                    struct tevent_timer *te,
  36                                    struct timeval t, void *p)
  37 {
  38         struct ctdb_context *ctdb = talloc_get_type(p, struct ctdb_context);
  39
  40         memmove(&ctdb->statistics_history[1], &ctdb->statistics_history[0], (MAX_STAT_HISTORY-1)*sizeof(struct ctdb_statistics));
  41         memcpy(&ctdb->statistics_history[0], &ctdb->statistics_current, sizeof(struct ctdb_statistics));
  42         ctdb->statistics_history[0].statistics_current_time = timeval_current();
  43
  44
  45         bzero(&ctdb->statistics_current, sizeof(struct ctdb_statistics));
  46         ctdb->statistics_current.statistics_start_time = timeval_current();
  47
  48         tevent_add_timer(ctdb->ev, ctdb,
  49                          timeval_current_ofs(ctdb->tunable.stat_history_interval, 0),
  50                          ctdb_statistics_update, ctdb);
  51 }
  52
  53 int ctdb_statistics_init(struct ctdb_context *ctdb)
  54 {
  55         bzero(&ctdb->statistics, sizeof(struct ctdb_statistics));
  56         ctdb->statistics.statistics_start_time = timeval_current();
  57
  58         bzero(&ctdb->statistics_current, sizeof(struct ctdb_statistics));
  59         ctdb->statistics_current.statistics_start_time = timeval_current();
  60
  61         bzero(ctdb->statistics_history, sizeof(ctdb->statistics_history));
  62
  63         tevent_add_timer(ctdb->ev, ctdb,
  64                          timeval_current_ofs(ctdb->tunable.stat_history_interval, 0),
  65                          ctdb_statistics_update, ctdb);
  66         return 0;
  67 }
  68
  69
  70 int32_t ctdb_control_get_stat_history(struct ctdb_context *ctdb,
  71                                       struct ctdb_req_control_old *c,
  72                                       TDB_DATA *outdata)
  73 {
  74         int len;
  75         struct ctdb_statistics_list_old *s;
  76
  77         len = offsetof(struct ctdb_statistics_list_old, stats) +
  78                 MAX_STAT_HISTORY*sizeof(struct ctdb_statistics);
  79
  80         s = talloc_size(outdata, len);
  81         if (s == NULL) {
  82                 DEBUG(DEBUG_ERR,(__location__ " Failed to allocate statistics history structure\n"));
  83                 return -1;
  84         }
  85
  86         s->num = MAX_STAT_HISTORY;
  87         memcpy(&s->stats[0], &ctdb->statistics_history[0], sizeof(ctdb->statistics_history));
  88
  89         outdata->dsize = len;
  90         outdata->dptr  = (uint8_t *)s;
  91
  92         return 0;
  93 }