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