| #!/bin/bash |
| |
| # |
| # This file and its contents are supplied under the terms of the |
| # Common Development and Distribution License ("CDDL"), version 1.0. |
| # You may only use this file in accordance with the terms of version |
| # 1.0 of the CDDL. |
| # |
| # A full copy of the text of the CDDL should have accompanied this |
| # source. A copy of the CDDL is also available via the Internet at |
| # http://www.illumos.org/license/CDDL. |
| # |
| |
| # |
| # Copyright (c) 2016 by Intel, Corp. |
| # |
| |
| # |
| # Linux platform placeholder for collecting prefetch I/O stats |
| # TBD if we can add additional kstats to achieve the desired results |
| # |
| |
| zfs_kstats="/proc/spl/kstat/zfs" |
| |
| function get_prefetch_ios |
| { |
| typeset -l data_misses=`awk '$1 == "prefetch_data_misses" \ |
| { print $3 }' $zfs_kstats/arcstats` |
| typeset -l metadata_misses=`awk '$1 == "prefetch_metadata_misses" \ |
| { print $3 }' $zfs_kstats/arcstats` |
| typeset -l total_misses=$(( $data_misses + $metadata_misses )) |
| |
| echo $total_misses |
| } |
| |
| function get_prefetched_demand_reads |
| { |
| typeset -l demand_reads=`awk '$1 == "demand_hit_predictive_prefetch" \ |
| { print $3 }' $zfs_kstats/arcstats` |
| |
| echo $demand_reads |
| } |
| |
| function get_async_upgrade_sync |
| { |
| typeset -l sync_wait=`awk '$1 == "async_upgrade_sync" \ |
| { print $3 }' $zfs_kstats/arcstats` |
| |
| echo $sync_wait |
| } |
| |
| if [ $# -ne 2 ] |
| then |
| echo "Usage: `basename $0` <poolname> interval" >&2 |
| exit 1 |
| fi |
| |
| poolname=$1 |
| interval=$2 |
| prefetch_ios=$(get_prefetch_ios) |
| prefetched_demand_reads=$(get_prefetched_demand_reads) |
| async_upgrade_sync=$(get_async_upgrade_sync) |
| |
| while true |
| do |
| new_prefetch_ios=$(get_prefetch_ios) |
| printf "%u\n%-24s\t%u\n" $(date +%s) "prefetch_ios" \ |
| $(( $new_prefetch_ios - $prefetch_ios )) |
| prefetch_ios=$new_prefetch_ios |
| |
| new_prefetched_demand_reads=$(get_prefetched_demand_reads) |
| printf "%-24s\t%u\n" "prefetched_demand_reads" \ |
| $(( $new_prefetched_demand_reads - $prefetched_demand_reads )) |
| prefetched_demand_reads=$new_prefetched_demand_reads |
| |
| new_async_upgrade_sync=$(get_async_upgrade_sync) |
| printf "%-24s\t%u\n" "async_upgrade_sync" \ |
| $(( $new_async_upgrade_sync - $async_upgrade_sync )) |
| async_upgrade_sync=$new_async_upgrade_sync |
| |
| sleep $interval |
| done |