1#!/usr/bin/env bash 2# shellcheck disable=SC1004 3 4# 5# This file and its contents are supplied under the terms of the 6# Common Development and Distribution License ("CDDL"), version 1.0. 7# You may only use this file in accordance with the terms of version 8# 1.0 of the CDDL. 9# 10# A full copy of the text of the CDDL should have accompanied this 11# source. A copy of the CDDL is also available via the Internet at 12# http://www.illumos.org/license/CDDL. 13# 14 15# 16# Copyright (c) 2016 by Intel, Corp. 17# 18 19# 20# Linux platform placeholder for collecting prefetch I/O stats 21# TBD if we can add additional kstats to achieve the desired results 22# 23 24zfs_kstats="/proc/spl/kstat/zfs" 25 26function get_prefetch_ios 27{ 28 typeset -l data_misses="$(awk '$1 == "prefetch_data_misses" \ 29 { print $3; exit }' "$zfs_kstats/arcstats")" 30 typeset -l metadata_misses="$(awk '$1 == "prefetch_metadata_misses" \ 31 { print $3; exit }' "$zfs_kstats/arcstats")" 32 typeset -l total_misses=$(( data_misses + metadata_misses )) 33 34 echo "$total_misses" 35} 36 37function get_prefetched_demand_reads 38{ 39 typeset -l demand_reads="$(awk '$1 == "demand_hit_predictive_prefetch" \ 40 { print $3; exit }' "$zfs_kstats/arcstats")" 41 42 echo "$demand_reads" 43} 44 45function get_async_upgrade_sync 46{ 47 typeset -l sync_wait="$(awk '$1 == "async_upgrade_sync" \ 48 { print $3; exit }' "$zfs_kstats/arcstats")" 49 50 echo "$sync_wait" 51} 52 53if [ $# -ne 2 ] 54then 55 echo "Usage: ${0##*/} poolname interval" >&2 56 exit 1 57fi 58 59interval=$2 60prefetch_ios=$(get_prefetch_ios) 61prefetched_demand_reads=$(get_prefetched_demand_reads) 62async_upgrade_sync=$(get_async_upgrade_sync) 63 64while true 65do 66 new_prefetch_ios=$(get_prefetch_ios) 67 printf '%u\n%-24s\t%u\n' "$(date +%s)" "prefetch_ios" \ 68 $(( new_prefetch_ios - prefetch_ios )) 69 prefetch_ios=$new_prefetch_ios 70 71 new_prefetched_demand_reads=$(get_prefetched_demand_reads) 72 printf '%-24s\t%u\n' "prefetched_demand_reads" \ 73 $(( new_prefetched_demand_reads - prefetched_demand_reads )) 74 prefetched_demand_reads=$new_prefetched_demand_reads 75 76 new_async_upgrade_sync=$(get_async_upgrade_sync) 77 printf '%-24s\t%u\n' "async_upgrade_sync" \ 78 $(( new_async_upgrade_sync - async_upgrade_sync )) 79 async_upgrade_sync=$new_async_upgrade_sync 80 81 sleep "$interval" 82done 83