| #!/usr/bin/env bash |
| # shellcheck disable=SC1004 |
| |
| # |
| # 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 $3; exit }' "$zfs_kstats/arcstats")" |
| typeset -l metadata_misses="$(awk '$1 == "prefetch_metadata_misses" \ |
| { print $3; exit }' "$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 $3; exit }' "$zfs_kstats/arcstats")" |
| |
| echo "$demand_reads" |
| } |
| |
| function get_async_upgrade_sync |
| { |
| typeset -l sync_wait="$(awk '$1 == "async_upgrade_sync" \ |
| { print $3; exit }' "$zfs_kstats/arcstats")" |
| |
| echo "$sync_wait" |
| } |
| |
| if [ $# -ne 2 ] |
| then |
| echo "Usage: ${0##*/} poolname interval" >&2 |
| exit 1 |
| fi |
| |
| 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 |