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