/**
* collectd - src/rrdtool.c
- * Copyright (C) 2006,2007 Florian octo Forster
+ * Copyright (C) 2006-2008 Florian octo Forster
*
* 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
enum
{
FLAG_NONE = 0x00,
- FLAG_QUEUED = 0x01
+ FLAG_QUEUED = 0x01,
+ FLAG_FLUSHQ = 0x02
} flags;
};
typedef struct rrd_cache_s rrd_cache_t;
+enum rrd_queue_dir_e
+{
+ QUEUE_INSERT_FRONT,
+ QUEUE_INSERT_BACK
+};
+typedef enum rrd_queue_dir_e rrd_queue_dir_t;
+
struct rrd_queue_s
{
char *filename;
"HeartBeat",
"RRARows",
"RRATimespan",
- "XFF"
+ "XFF",
+ "WritesPerSecond"
};
static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
static int heartbeat = 0;
static int rrarows = 1200;
static double xff = 0.1;
+static double write_rate = 0.0;
/* XXX: If you need to lock both, cache_lock and queue_lock, at the same time,
* ALWAYS lock `cache_lock' first! */
static rrd_queue_t *queue_head = NULL;
static rrd_queue_t *queue_tail = NULL;
+static rrd_queue_t *flushq_head = NULL;
+static rrd_queue_t *flushq_tail = NULL;
static pthread_t queue_thread = 0;
static pthread_mutex_t queue_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t queue_cond = PTHREAD_COND_INITIALIZER;
}
if (isnan (d->min))
- strcpy (min, "U");
+ {
+ sstrncpy (min, "U", sizeof (min));
+ }
else
ssnprintf (min, sizeof (min), "%lf", d->min);
if (isnan (d->max))
- strcpy (max, "U");
+ {
+ sstrncpy (max, "U", sizeof (max));
+ }
else
ssnprintf (max, sizeof (max), "%lf", d->max);
#if HAVE_THREADSAFE_LIBRRD
static int srrd_create (char *filename, unsigned long pdp_step, time_t last_up,
- int argc, char **argv)
+ int argc, const char **argv)
{
int status;
optind = 0; /* bug in librrd? */
rrd_clear_error ();
- status = rrd_create_r (filename, pdp_step, last_up, argc, argv);
+ status = rrd_create_r (filename, pdp_step, last_up, argc, (void *) argv);
if (status != 0)
{
return (status);
} /* int srrd_create */
-static int srrd_update (char *filename, char *template, int argc, char **argv)
+static int srrd_update (char *filename, char *template,
+ int argc, const char **argv)
{
int status;
optind = 0; /* bug in librrd? */
rrd_clear_error ();
- status = rrd_update_r (filename, template, argc, argv);
+ status = rrd_update_r (filename, template, argc, (void *) argv);
if (status != 0)
{
#else /* !HAVE_THREADSAFE_LIBRRD */
static int srrd_create (char *filename, unsigned long pdp_step, time_t last_up,
- int argc, char **argv)
+ int argc, const char **argv)
{
int status;
return (status);
} /* int srrd_create */
-static int srrd_update (char *filename, char *template, int argc, char **argv)
+static int srrd_update (char *filename, char *template,
+ int argc, const char **argv)
{
int status;
status = srrd_create (filename,
(stepsize > 0) ? stepsize : vl->interval,
vl->time - 10,
- argc, argv);
+ argc, (const char **)argv);
free (argv);
ds_free (ds_num, ds_def);
static void *rrd_queue_thread (void *data)
{
+ struct timeval tv_next_update;
+ struct timeval tv_now;
+
+ gettimeofday (&tv_next_update, /* timezone = */ NULL);
+
while (42)
{
rrd_queue_t *queue_entry;
rrd_cache_t *cache_entry;
char **values;
int values_num;
+ int status;
int i;
- /* XXX: If you need to lock both, cache_lock and queue_lock, at
- * the same time, ALWAYS lock `cache_lock' first! */
-
- /* wait until an entry is available */
- pthread_mutex_lock (&queue_lock);
- while ((queue_head == NULL) && (do_shutdown == 0))
- pthread_cond_wait (&queue_cond, &queue_lock);
-
- /* We're in the shutdown phase */
- if (queue_head == NULL)
- {
- pthread_mutex_unlock (&queue_lock);
- break;
- }
-
- /* Dequeue the first entry */
- queue_entry = queue_head;
- if (queue_head == queue_tail)
- queue_head = queue_tail = NULL;
- else
- queue_head = queue_head->next;
+ pthread_mutex_lock (&queue_lock);
+ /* Wait for values to arrive */
+ while (true)
+ {
+ struct timespec ts_wait;
+
+ while ((flushq_head == NULL) && (queue_head == NULL)
+ && (do_shutdown == 0))
+ pthread_cond_wait (&queue_cond, &queue_lock);
+
+ if ((flushq_head == NULL) && (queue_head == NULL))
+ break;
+
+ /* Don't delay if there's something to flush */
+ if (flushq_head != NULL)
+ break;
+
+ /* Don't delay if we're shutting down */
+ if (do_shutdown != 0)
+ break;
+
+ /* Don't delay if no delay was configured. */
+ if (write_rate <= 0.0)
+ break;
+
+ gettimeofday (&tv_now, /* timezone = */ NULL);
+ status = timeval_sub_timespec (&tv_next_update, &tv_now,
+ &ts_wait);
+ /* We're good to go */
+ if (status != 0)
+ break;
+
+ /* We're supposed to wait a bit with this update, so we'll
+ * wait for the next addition to the queue or to the end of
+ * the wait period - whichever comes first. */
+ ts_wait.tv_sec = tv_next_update.tv_sec;
+ ts_wait.tv_nsec = 1000 * tv_next_update.tv_usec;
+
+ status = pthread_cond_timedwait (&queue_cond, &queue_lock,
+ &ts_wait);
+ if (status == ETIMEDOUT)
+ break;
+ } /* while (true) */
+
+ /* XXX: If you need to lock both, cache_lock and queue_lock, at
+ * the same time, ALWAYS lock `cache_lock' first! */
+
+ /* We're in the shutdown phase */
+ if ((flushq_head == NULL) && (queue_head == NULL))
+ {
+ pthread_mutex_unlock (&queue_lock);
+ break;
+ }
+
+ if (flushq_head != NULL)
+ {
+ /* Dequeue the first flush entry */
+ queue_entry = flushq_head;
+ if (flushq_head == flushq_tail)
+ flushq_head = flushq_tail = NULL;
+ else
+ flushq_head = flushq_head->next;
+ }
+ else /* if (queue_head != NULL) */
+ {
+ /* Dequeue the first regular entry */
+ queue_entry = queue_head;
+ if (queue_head == queue_tail)
+ queue_head = queue_tail = NULL;
+ else
+ queue_head = queue_head->next;
+ }
/* Unlock the queue again */
pthread_mutex_unlock (&queue_lock);
* we make a copy of it's values */
pthread_mutex_lock (&cache_lock);
- c_avl_get (cache, queue_entry->filename, (void *) &cache_entry);
+ status = c_avl_get (cache, queue_entry->filename,
+ (void *) &cache_entry);
- values = cache_entry->values;
- values_num = cache_entry->values_num;
+ if (status == 0)
+ {
+ values = cache_entry->values;
+ values_num = cache_entry->values_num;
- cache_entry->values = NULL;
- cache_entry->values_num = 0;
- cache_entry->flags = FLAG_NONE;
+ cache_entry->values = NULL;
+ cache_entry->values_num = 0;
+ cache_entry->flags = FLAG_NONE;
+ }
pthread_mutex_unlock (&cache_lock);
+ if (status != 0)
+ {
+ sfree (queue_entry->filename);
+ sfree (queue_entry);
+ continue;
+ }
+
+ /* Update `tv_next_update' */
+ if (write_rate > 0.0)
+ {
+ gettimeofday (&tv_now, /* timezone = */ NULL);
+ tv_next_update.tv_sec = tv_now.tv_sec;
+ tv_next_update.tv_usec = tv_now.tv_usec
+ + ((suseconds_t) (1000000 * write_rate));
+ while (tv_next_update.tv_usec > 1000000)
+ {
+ tv_next_update.tv_sec++;
+ tv_next_update.tv_usec -= 1000000;
+ }
+ }
+
/* Write the values to the RRD-file */
- srrd_update (queue_entry->filename, NULL, values_num, values);
+ srrd_update (queue_entry->filename, NULL,
+ values_num, (const char **)values);
DEBUG ("rrdtool plugin: queue thread: Wrote %i values to %s",
values_num, queue_entry->filename);
return ((void *) 0);
} /* void *rrd_queue_thread */
-static int rrd_queue_cache_entry (const char *filename)
+static int rrd_queue_enqueue (const char *filename,
+ rrd_queue_t **head, rrd_queue_t **tail)
{
- rrd_queue_t *queue_entry;
+ rrd_queue_t *queue_entry;
- queue_entry = (rrd_queue_t *) malloc (sizeof (rrd_queue_t));
- if (queue_entry == NULL)
- return (-1);
+ queue_entry = (rrd_queue_t *) malloc (sizeof (rrd_queue_t));
+ if (queue_entry == NULL)
+ return (-1);
- queue_entry->filename = strdup (filename);
- if (queue_entry->filename == NULL)
- {
- free (queue_entry);
- return (-1);
- }
+ queue_entry->filename = strdup (filename);
+ if (queue_entry->filename == NULL)
+ {
+ free (queue_entry);
+ return (-1);
+ }
- queue_entry->next = NULL;
+ queue_entry->next = NULL;
- pthread_mutex_lock (&queue_lock);
- if (queue_tail == NULL)
- queue_head = queue_entry;
- else
- queue_tail->next = queue_entry;
- queue_tail = queue_entry;
- pthread_cond_signal (&queue_cond);
- pthread_mutex_unlock (&queue_lock);
+ pthread_mutex_lock (&queue_lock);
- DEBUG ("rrdtool plugin: Put `%s' into the update queue", filename);
+ if (*tail == NULL)
+ *head = queue_entry;
+ else
+ (*tail)->next = queue_entry;
+ *tail = queue_entry;
- return (0);
-} /* int rrd_queue_cache_entry */
+ pthread_cond_signal (&queue_cond);
+ pthread_mutex_unlock (&queue_lock);
+
+ return (0);
+} /* int rrd_queue_enqueue */
+
+static int rrd_queue_dequeue (const char *filename,
+ rrd_queue_t **head, rrd_queue_t **tail)
+{
+ rrd_queue_t *this;
+ rrd_queue_t *prev;
+
+ pthread_mutex_lock (&queue_lock);
+
+ prev = NULL;
+ this = *head;
+
+ while (this != NULL)
+ {
+ if (strcmp (this->filename, filename) == 0)
+ break;
+
+ prev = this;
+ this = this->next;
+ }
+
+ if (this == NULL)
+ {
+ pthread_mutex_unlock (&queue_lock);
+ return (-1);
+ }
+
+ if (prev == NULL)
+ *head = this->next;
+ else
+ prev->next = this->next;
+
+ if (this->next == NULL)
+ *tail = prev;
+
+ pthread_mutex_unlock (&queue_lock);
+
+ sfree (this->filename);
+ sfree (this);
+
+ return (0);
+} /* int rrd_queue_dequeue */
static void rrd_cache_flush (int timeout)
{
iter = c_avl_get_iterator (cache);
while (c_avl_iterator_next (iter, (void *) &key, (void *) &rc) == 0)
{
- if (rc->flags == FLAG_QUEUED)
+ if (rc->flags != FLAG_NONE)
continue;
else if ((now - rc->first_value) < timeout)
continue;
else if (rc->values_num > 0)
{
- if (rrd_queue_cache_entry (key) == 0)
+ int status;
+
+ status = rrd_queue_enqueue (key, &queue_head, &queue_tail);
+ if (status == 0)
rc->flags = FLAG_QUEUED;
}
else /* ancient and no values -> waste of memory */
rrd_cache_t *rc;
time_t now;
int status;
- char *key;
- size_t key_size;
+ char key[2048];
if (identifier == NULL)
{
now = time (NULL);
- key_size = strlen (identifier + 5) * sizeof (char);
- key = (char *) malloc (key_size);
- if (key == NULL)
- {
- ERROR ("rrdtool plugin: rrd_cache_flush_identifier: malloc failed.");
- return (-1);
- }
- snprintf (key, key_size, "%s.rrd", identifier);
- key[key_size - 1] = 0;
+ if (datadir == NULL)
+ snprintf (key, sizeof (key), "%s.rrd",
+ identifier);
+ else
+ snprintf (key, sizeof (key), "%s/%s.rrd",
+ datadir, identifier);
+ key[sizeof (key) - 1] = 0;
status = c_avl_get (cache, key, (void *) &rc);
if (status != 0)
{
WARNING ("rrdtool plugin: rrd_cache_flush_identifier: "
- "c_avl_get (%s) failed. Does that file really exist?",
- key);
+ "c_avl_get (%s) failed. Does that file really exist?",
+ key);
return (status);
}
- if (rc->flags == FLAG_QUEUED)
+ if (rc->flags == FLAG_FLUSHQ)
+ {
status = 0;
+ }
+ else if (rc->flags == FLAG_QUEUED)
+ {
+ rrd_queue_dequeue (key, &queue_head, &queue_tail);
+ status = rrd_queue_enqueue (key, &flushq_head, &flushq_tail);
+ if (status == 0)
+ rc->flags = FLAG_FLUSHQ;
+ }
else if ((now - rc->first_value) < timeout)
+ {
status = 0;
+ }
else if (rc->values_num > 0)
{
- status = rrd_queue_cache_entry (key);
+ status = rrd_queue_enqueue (key, &flushq_head, &flushq_tail);
if (status == 0)
- rc->flags = FLAG_QUEUED;
+ rc->flags = FLAG_FLUSHQ;
}
return (status);
pthread_mutex_lock (&cache_lock);
+ /* This shouldn't happen, but it did happen at least once, so we'll be
+ * careful. */
+ if (cache == NULL)
+ {
+ pthread_mutex_unlock (&cache_lock);
+ WARNING ("rrdtool plugin: cache == NULL.");
+ return (-1);
+ }
+
c_avl_get (cache, filename, (void *) &rc);
if (rc == NULL)
}
DEBUG ("rrdtool plugin: rrd_cache_insert: file = %s; "
- "values_num = %i; age = %u;",
+ "values_num = %i; age = %lu;",
filename, rc->values_num,
- rc->last_value - rc->first_value);
+ (unsigned long)(rc->last_value - rc->first_value));
if ((rc->last_value - rc->first_value) >= cache_timeout)
{
/* XXX: If you need to lock both, cache_lock and queue_lock, at
* the same time, ALWAYS lock `cache_lock' first! */
- if (rc->flags != FLAG_QUEUED)
+ if (rc->flags == FLAG_NONE)
{
- if (rrd_queue_cache_entry (filename) == 0)
+ int status;
+
+ status = rrd_queue_enqueue (filename, &queue_head, &queue_tail);
+ if (status == 0)
rc->flags = FLAG_QUEUED;
}
else
((time (NULL) - cache_flush_last) > cache_flush_timeout))
rrd_cache_flush (cache_flush_timeout);
-
pthread_mutex_unlock (&cache_lock);
return (0);
{
fprintf (stderr, "rrdtool: `CacheTimeout' must "
"be greater than 0.\n");
+ ERROR ("rrdtool: `CacheTimeout' must "
+ "be greater than 0.\n");
return (1);
}
cache_timeout = tmp;
{
fprintf (stderr, "rrdtool: `CacheFlush' must "
"be greater than 0.\n");
+ ERROR ("rrdtool: `CacheFlush' must "
+ "be greater than 0.\n");
return (1);
}
cache_flush_timeout = tmp;
{
fprintf (stderr, "rrdtool: `RRARows' must "
"be greater than 0.\n");
+ ERROR ("rrdtool: `RRARows' must "
+ "be greater than 0.\n");
return (1);
}
rrarows = tmp;
if (tmp_alloc == NULL)
{
fprintf (stderr, "rrdtool: realloc failed.\n");
+ ERROR ("rrdtool: realloc failed.\n");
free (value_copy);
return (1);
}
{
fprintf (stderr, "rrdtool: `XFF' must "
"be in the range 0 to 1 (exclusive).");
+ ERROR ("rrdtool: `XFF' must "
+ "be in the range 0 to 1 (exclusive).");
return (1);
}
xff = tmp;
}
+ else if (strcasecmp ("WritesPerSecond", key) == 0)
+ {
+ double wps = atof (value);
+
+ if (wps < 0.0)
+ {
+ fprintf (stderr, "rrdtool: `WritesPerSecond' must be "
+ "greater than or equal to zero.");
+ return (1);
+ }
+ else if (wps == 0.0)
+ {
+ write_rate = 0.0;
+ }
+ else
+ {
+ write_rate = 1.0 / wps;
+ }
+ }
else
{
return (-1);
projects / collectd.git / blobdiff