added new plugin: "kernel_same_page_merging" (#1271)
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#!/bin/bash
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#%# family=auto
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: << EOF
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=head1 NAME
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kernel_same_page_merging - Outputs various metrics about same page merging.
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=head1 AUTHOR
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=over 4
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=item * Michael Grote
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=back
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=head1 LICENSE
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GPLv3 or later
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SPDX-License-Identifier: GPL-3.0-or-later
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=head1 MAGIC MARKERS
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=begin comment
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These magic markers are used by munin-node-configure when installing
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munin-node.
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=end comment
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#%# family=auto
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=cut
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EOF
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#
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# Variablen
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ksm_dir_run="/sys/kernel/mm/ksm/run"
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function print_labels {
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cat << EOF
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graph_title kernel same page merging
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graph_category system
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graph_order pages_unshared pages_volatile pages_shared pages_sharing
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pages_shared.info how many shared pages are being used
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pages_sharing.info how many more sites are sharing them i.e. how much saved
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pages_unshared.info how many pages unique but repeatedly checked for merging
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pages_volatile.info how many pages changing too fast to be placed in a tree
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pages_shared.label pages shared
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pages_sharing.label pages sharing
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pages_unshared.label pages unshared
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pages_volatile.label pages volatile
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pages_shared.draw AREASTACK
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pages_sharing.draw AREASTACK
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pages_unshared.draw AREASTACK
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pages_volatile.draw AREASTACK
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EOF
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}
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# wenn parameter = ...
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if [ "$1" = "autoconf" ]; then
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# prüfe ob ksm aktiviert ist
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if [ ! -f "$ksm_dir_run" ]; then
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echo "no ($ksm_dir_run not found)"
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exit 0
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fi
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echo yes
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exit 0
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fi
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if [ "$1" = "config" ]; then
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# setze label
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print_labels
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exit 0
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fi
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echo pages_shared.value $(cat "/sys/kernel/mm/ksm/pages_shared")
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echo pages_sharing.value $(cat "/sys/kernel/mm/ksm/pages_sharing")
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echo pages_unshared.value $(cat "/sys/kernel/mm/ksm/pages_unshared")
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echo pages_volatile.value $(cat "/sys/kernel/mm/ksm/pages_volatile")
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