add bcachefs_time_stats measurement

README.md

@@ -14,6 +14,9 @@ Add the following config section to your telegraf.yml:
 [[inputs.exec]]
   commands = ["/etc/telegraf/bcachefs_perf.sh"]
   data_format = "influx"
+[[inputs.exec]]
+  commands = ["/etc/telegraf/bcachefs_time_stats.sh"]
+  data_format = "influx"
 ```
 
 ![example disks table](disks-table.png)

bcachefs_time_stats.sh

@@ -0,0 +1,108 @@
+#!/bin/bash
+set -euo pipefail
+
+function to_ns()
+{
+    local val unit
+    read -r val unit <<< "$1"
+
+    case "$unit" in
+        ns) echo "$val" ;;
+        us) echo $(( val * 1000 )) ;;
+        ms) echo $(( val * 1000000 )) ;;
+        s)  echo $(( val * 1000000000 )) ;;
+        m)  echo $(( val * 60 * 1000000000 )) ;;
+        h)  echo $(( val * 3600 * 1000000000 )) ;;
+        d)  echo $(( val * 86400 * 1000000000 )) ;;
+        w)  echo $(( val * 604800 * 1000000000 )) ;;
+        eon) echo 0 ;;   # bcachefs uses this as "infinite"
+        *) echo 0 ;;
+    esac
+}
+
+cd /sys/fs/bcachefs
+
+for uuid in *; do
+    cd "$uuid/time_stats"
+
+    for stat in * ; do
+        count=""
+        dur_min=""
+        dur_max=""
+        dur_total=""
+
+        mean_since=""
+        mean_recent=""
+        stddev_since=""
+        stddev_recent=""
+
+        in_duration=0
+
+        while IFS= read -r line; do
+            # trim leading whitespace
+            line="${line#"${line%%[![:space:]]*}"}"
+
+            case "$line" in
+                count:*)
+                    count="${line#count:}"
+                    count="${count//[[:space:]]/}"
+                    ;;
+                "duration of events")
+                    in_duration=1
+                    ;;
+                "time between events")
+                    in_duration=0
+                    ;;
+                min:*)
+                    (( in_duration )) && dur_min="${line#min:}"
+                    ;;
+                max:*)
+                    (( in_duration )) && dur_max="${line#max:}"
+                    ;;
+                total:*)
+                    (( in_duration )) && dur_total="${line#total:}"
+                    ;;
+                mean:*)
+                    if (( in_duration )); then
+                        rest="${line#mean:}"
+                        read -r ms_val ms_unit mr_val mr_unit <<< "$rest"
+                        mean_since="$ms_val $ms_unit"
+                        mean_recent="$mr_val $mr_unit"
+                    fi
+                    ;;
+                stddev:*)
+                    if (( in_duration )); then
+                        rest="${line#stddev:}"
+                        read -r ss_val ss_unit sr_val sr_unit <<< "$rest"
+                        stddev_since="$ss_val $ss_unit"
+                        stddev_recent="$sr_val $sr_unit"
+                    fi
+                    ;;
+            esac
+        done < "$stat"
+
+        # trim leading whitespace
+        for v in dur_min dur_max dur_total mean_since mean_recent stddev_since stddev_recent; do
+            eval "$v=\"\${$v#\"\${$v%%[![:space:]]*}\"}\""
+        done
+
+        dur_min_ns=$(to_ns "$dur_min")
+        dur_max_ns=$(to_ns "$dur_max")
+        dur_total_ns=$(to_ns "$dur_total")
+        mean_since_ns=$(to_ns "$mean_since")
+        mean_recent_ns=$(to_ns "$mean_recent")
+        stddev_since_ns=$(to_ns "$stddev_since")
+        stddev_recent_ns=$(to_ns "$stddev_recent")
+
+        printf "bcachefs_time_stats,uuid=%s,stat=%s " "$uuid" "$stat"
+        printf "count=%si," "$count"
+        printf "dur_min_ns=%si,dur_max_ns=%si,dur_total_ns=%si," \
+               "$dur_min_ns" "$dur_max_ns" "$dur_total_ns"
+        printf "mean_since_ns=%si,mean_recent_ns=%si," \
+               "$mean_since_ns" "$mean_recent_ns"
+        printf "stddev_since_ns=%si,stddev_recent_ns=%si\n" \
+               "$stddev_since_ns" "$stddev_recent_ns"
+    done
+
+    cd ..
+done