disk plugin: Add metric for pending I/O operations.

This is only supported on Linux right now.

Fixes: #705

diff --git a/src/disk.c b/src/disk.c
index cdf2816..e84e835 100644 (file)
--- a/src/disk.c
+++ b/src/disk.c
@@ -272,6 +272,26 @@ static void disk_submit (const char *plugin_instance,
 } /* void disk_submit */
 
 #if KERNEL_LINUX
+static void submit_in_progress (char const *disk_name, gauge_t in_progress)
+{
+       value_t v;
+       value_list_t vl = VALUE_LIST_INIT;
+
+       if (ignorelist_match (ignorelist, disk_name) != 0)
+         return;
+
+       v.gauge = in_progress;
+
+       vl.values = &v;
+       vl.values_len = 1;
+       sstrncpy (vl.host, hostname_g, sizeof (vl.host));
+       sstrncpy (vl.plugin, "disk", sizeof (vl.plugin));
+       sstrncpy (vl.plugin_instance, disk_name, sizeof (vl.plugin_instance));
+       sstrncpy (vl.type, "pending_operations", sizeof (vl.type));
+
+       plugin_dispatch_values (&vl);
+}
+
 static counter_t disk_calc_time_incr (counter_t delta_time, counter_t delta_ops)
 {
        double interval = CDTIME_T_TO_DOUBLE (plugin_get_interval ());
@@ -539,6 +559,7 @@ static int disk_read (void)
        derive_t write_ops     = 0;
        derive_t write_merged  = 0;
        derive_t write_time    = 0;
+       gauge_t in_progress    = NAN;
        int is_disk = 0;
 
        diskstats_t *ds, *pre_ds;
@@ -620,6 +641,8 @@ static int disk_read (void)
                                read_time    = atoll (fields[6 + fieldshift]);
                                write_merged = atoll (fields[8 + fieldshift]);
                                write_time   = atoll (fields[10+ fieldshift]);
+
+                               in_progress = atof (fields[11 + fieldshift]);
                        }
                }
                else
@@ -743,6 +766,7 @@ static int disk_read (void)
                {
                        disk_submit (output_name, "disk_merged",
                                        read_merged, write_merged);
+                       submit_in_progress (output_name, in_progress);
                } /* if (is_disk) */
 
                /* release udev-based alternate name, if allocated */

diff --git a/src/types.db b/src/types.db
index fcdea23..64137b0 100644 (file)
--- a/src/types.db
+++ b/src/types.db
@@ -122,6 +122,7 @@ node_stat           value:DERIVE:0:U
 node_tx_rate           value:GAUGE:0:127
 objects                        value:GAUGE:0:U
 operations             value:DERIVE:0:U
+pending_operations     value:GAUGE:0:U
 percent                        value:GAUGE:0:100.1
 percent_bytes          value:GAUGE:0:100.1
 percent_inodes         value:GAUGE:0:100.1