Add rolling statistics that are collected across 10 second intervals.

Add a new command "ctdb stats [num]" that prints the [num] most recent statistics intervals collected.

(This used to be ctdb commit e6e16fcd5a45ebd3739a8160c8fb5f44494edb9e)

1 files changed, 77 insertions, 0 deletions

diff --git a/ctdb/server/ctdb_statistics.c b/ctdb/server/ctdb_statistics.c
new file mode 100644
index 00000000000..243a4f2789b
--- /dev/null
+++ b/ctdb/server/ctdb_statistics.c
@@ -0,0 +1,77 @@
+/* 
+   ctdb statistics code
+
+   Copyright (C) Ronnie Sahlberg 2010
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include <string.h>
+#include "lib/tevent/tevent.h"
+#include "../include/ctdb_private.h"
+
+static void ctdb_statistics_update(struct event_context *ev, struct timed_event *te, 
+				   struct timeval t, void *p)
+{
+	struct ctdb_context *ctdb = talloc_get_type(p, struct ctdb_context);
+
+	memmove(&ctdb->statistics_history[1], &ctdb->statistics_history[0], (MAX_STAT_HISTORY-1)*sizeof(struct ctdb_statistics));
+	memcpy(&ctdb->statistics_history[0], &ctdb->statistics_current, sizeof(struct ctdb_statistics));
+	ctdb->statistics_history[0].statistics_current_time = timeval_current();
+
+
+	bzero(&ctdb->statistics_current, sizeof(struct ctdb_statistics));
+	ctdb->statistics_current.statistics_start_time = timeval_current();
+
+	event_add_timed(ctdb->ev, ctdb, timeval_current_ofs(10, 0), ctdb_statistics_update, ctdb);
+}
+
+int ctdb_statistics_init(struct ctdb_context *ctdb)
+{
+	bzero(&ctdb->statistics, sizeof(struct ctdb_statistics));
+
+	bzero(&ctdb->statistics_current, sizeof(struct ctdb_statistics));
+	ctdb->statistics_current.statistics_start_time = timeval_current();
+
+	bzero(ctdb->statistics_history, sizeof(ctdb->statistics_history));
+
+	event_add_timed(ctdb->ev, ctdb, timeval_current_ofs(10, 0), ctdb_statistics_update, ctdb);
+	return 0;
+}
+
+
+int32_t ctdb_control_get_stat_history(struct ctdb_context *ctdb, 
+				      struct ctdb_req_control *c,
+				      TDB_DATA *outdata)
+{
+	int len;
+	struct ctdb_statistics_wire *stat;
+
+	len = offsetof(struct ctdb_statistics_wire, stats) + MAX_STAT_HISTORY*sizeof(struct ctdb_statistics);
+
+	stat = talloc_size(outdata, len);
+	if (stat == NULL) {
+		DEBUG(DEBUG_ERR,(__location__ " Failed to allocate statistics history structure\n"));
+		return -1;
+	}
+
+	stat->num = MAX_STAT_HISTORY;
+	memcpy(&stat->stats[0], &ctdb->statistics_history[0], sizeof(ctdb->statistics_history));
+
+	outdata->dsize = len;
+	outdata->dptr  = (uint8_t *)stat;
+
+	return 0;
+}