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Cachestats for dm-cache

cachestats.sh

@@ -0,0 +1,123 @@
+#!/bin/bash
+
+# cachestats for dm-cache
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+# Copyright 2023 Forza <forza@tnonline.net>
+
+device_name="$1"
+
+# Declare an associative array to store key-value pairs
+declare -A data
+declare -i sizess
+declare status_output
+declare -a dmstatus
+
+# Get the status output using dmsetup
+status_output=$(dmsetup status "$device_name" 2>/dev/null)
+
+# Check if the device exists and has valid output
+if [ -n "$status_output" ]; then
+	sizess=$(blockdev --getss "/dev/mapper/${device_name}")
+	
+	# Parse the status information into the associative array
+	IFS='/: ' read -r -a dmstatus <<< "$status_output"
+	
+	## Ouput `dmsetup status` raw data:
+	#	for ((i = 0; i < ${#dmstatus[@]}; i += 1)); do
+	#		echo \# $i: ${dmstatus["$i"]}
+	#	done
+	
+	# Field order of `dmsetup status <cachedev>`:
+	# https://www.kernel.org/doc/html/latest/admin-guide/device-mapper/cache.html
+	#
+	# <metadata block size> <#used metadata blocks>/<#total metadata blocks>
+	# <cache block size> <#used cache blocks>/<#total cache blocks>
+	# <#read hits> <#read misses> <#write hits> <#write misses>
+	# <#demotions> <#promotions> <#dirty> <#features> <features>*
+	# <#core args> <core args>* <policy name> <#policy args> <policy args>*
+	# <cache metadata mode>
+
+	data["name"]="$device_name"
+	data["origin_start"]=$(( ${dmstatus[0]} * $sizess )) # in sectors
+	data["origin_length"]=$(( ${dmstatus[1]} * $sizess )) # in sectors
+	data["table_type"]="${dmstatus[2]}"
+	data["metadata_block_size"]=$(( ${dmstatus[3]} * $sizess )) # in sectors
+	data["used_metadata_blocks"]="${dmstatus[4]}"
+	data["total_metadata_blocks"]="${dmstatus[5]}"
+	data["cache_block_size"]=$(( ${dmstatus[6]} * $sizess )) # in sectors
+	data["used_cache_blocks"]="${dmstatus[7]}"
+	data["total_cache_blocks"]="${dmstatus[8]}"
+	data["read_hits"]="${dmstatus[9]}"
+	data["read_misses"]="${dmstatus[10]}"
+	data["write_hits"]="${dmstatus[11]}"
+	data["write_misses"]="${dmstatus[12]}"
+	data["demotions"]="${dmstatus[13]}"
+	data["promotions"]="${dmstatus[14]}"
+	data["dirty_cache"]=$(( ${dmstatus[15]} * ${data[cache_block_size]} ))
+	if [ "${dmstatus[16]}" = 2 ]; then
+		data["cache_type"]="${dmstatus[17]}"
+		data["discard_passdown"]="${dmstatus[18]}"
+		data["migration_threshold"]=$(( ${dmstatus[21]} * $sizess ))
+		data["cache_policy"]="${dmstatus[22]}"
+		data["smq_count"]="${dmstatus[23]}"
+		data["cache_rw"]="${dmstatus[24]}"
+		data["status"]="${dmstatus[25]//-/OK}"
+	else
+		data["cache_type"]="${dmstatus[17]}"
+		data["discard_passdown"]="true"
+		data["migration_threshold"]=$(( ${dmstatus[20]} * $sizess ))
+		data["cache_policy"]="${dmstatus[21]}"
+		data["smq_count"]="${dmstatus[22]}"
+		data["cache_rw"]="${dmstatus[23]}"
+		data["status"]="${dmstatus[24]//-/OK}"
+	fi
+
+# Loop through throuh all fields to list and print their values
+#	for field in "${!data[@]}"; do
+#		value="${data[$field]}"
+#		if [ -n "$value" ]; then
+#			echo "$field : $value"
+#		else
+#			echo "Field '$field' not found."
+#		fi
+#	done |sort
+
+	# Output defined fields
+	printf "\n"
+	printf "DEVICE\n"
+	printf "========\n"
+	printf "%-*s%s\n" "30" "Device-mapper device: " "${data[name]}"
+	printf "%-*s%s\n" "30" "Origin size: " "$(( ${data[origin_length]} - ${data[origin_start]} )) bytes"
+	printf "%-*s%s\n" "30" "Discards: " "${data[discard_passdown]}"
+
+	printf "\n"
+	printf "CACHE\n"
+	printf "========\n"
+	printf "%-*s%s\n" "30" "Cache Size: " "$(( ${data[total_cache_blocks]} * ${data[cache_block_size]} )) bytes"
+	printf "%-*s%s\n" "30" "Cache Usage: "  "$(( ${data[used_cache_blocks]} * ${data[cache_block_size]} )) bytes"
+	printf "%-*s%s\n" "30" "Cache Usage: " "$(( 100 * ${data[used_cache_blocks]} / ${data[total_cache_blocks]} )) %"
+	printf "%-*s%s\n" "30" "Cache Read Hit: " "${data[read_hits]}"
+	printf "%-*s%s\n" "30" "Cache Read Miss: " "${data[read_misses]}"
+	printf "%-*s%s\n" "30" "Cache Write Hit: " "${data[write_hits]}"
+	printf "%-*s%s\n" "30" "Cache Write Miss: " "${data[write_misses]}"
+	printf "%-*s%s\n" "30" "Cache Dirty: " "${data[dirty_cache]} bytes"
+	printf "%-*s%s\n" "30" "Cache Block Size: " "${data[cache_block_size]} bytes"
+	printf "%-*s%s\n" "30" "Cache Promotions: " "${data[promotions]}"
+	printf "%-*s%s\n" "30" "Cache Demotions: " "${data[demotions]}"
+	printf "%-*s%s\n" "30" "Cache Migration Threshold: " "${data[migration_threshold]} bytes"
+	printf "%-*s%s\n" "30" "Cache RW mode: " "${data[cache_rw]}"
+	printf "%-*s%s\n" "30" "Cache Type: " "${data[cache_type]}"
+	printf "%-*s%s\n" "30" "Cache Policy: " "${data[cache_policy]}"
+	printf "%-*s%s\n" "30" "Cache Status: " "${data[status]}"
+
+	printf "\n"
+	printf "METADATA\n"
+	printf "========\n"
+	printf "%-*s%s\n" "30" "Metadata Size: " "$(( ${data[total_metadata_blocks]} * ${data[metadata_block_size]} )) bytes"
+	printf "%-*s%s\n" "30" "Metadata Usage: "  "$(( ${data[used_metadata_blocks]} * ${data[metadata_block_size]} )) bytes"
+	printf "%-*s%s\n" "30" "Metadata Usage: " "$(( 100 * ${data[used_metadata_blocks]} / ${data[total_metadata_blocks]} )) %"
+
+else
+    echo "Device not found or no valid status output."
+fi