Munin contributed plugins

#!/bin/bash

#%# family=auto

: << EOF

=head1 NAME

kernel_same_page_merging - Outputs various metrics about same page merging.

=head1 AUTHOR

=over 4

=item * Michael Grote

=back

=head1 LICENSE

GPLv3 or later

SPDX-License-Identifier: GPL-3.0-or-later

=head1 MAGIC MARKERS

=begin comment

These magic markers are used by munin-node-configure when installing

munin-node.

=end comment

  #%# family=auto

=cut

EOF

#

# Variablen

ksm_dir_run="/sys/kernel/mm/ksm/run"

function print_labels {

cat << EOF

graph_title kernel same page merging

graph_category system

graph_order pages_unshared pages_volatile pages_shared pages_sharing

pages_shared.info how many shared pages are being used

pages_sharing.info how many more sites are sharing them i.e. how much saved

pages_unshared.info how many pages unique but repeatedly checked for merging

pages_volatile.info how many pages changing too fast to be placed in a tree

pages_shared.label pages shared

pages_sharing.label pages sharing

pages_unshared.label pages unshared

pages_volatile.label pages volatile

pages_shared.draw AREASTACK

pages_sharing.draw AREASTACK

pages_unshared.draw AREASTACK

pages_volatile.draw AREASTACK

EOF

}

# wenn parameter = ...

if [ "$1" = "autoconf" ]; then

  # prüfe ob ksm aktiviert ist

  if [ ! -f "$ksm_dir_run" ]; then

    echo "no ($ksm_dir_run not found)"

    exit 0

  fi

  echo yes

  exit 0

fi

if [ "$1" = "config" ]; then

  # setze label

  print_labels

  exit 0

fi

echo pages_shared.value $(cat "/sys/kernel/mm/ksm/pages_shared")

echo pages_sharing.value $(cat "/sys/kernel/mm/ksm/pages_sharing")

echo pages_unshared.value $(cat "/sys/kernel/mm/ksm/pages_unshared")

echo pages_volatile.value $(cat "/sys/kernel/mm/ksm/pages_volatile")