contrib/exec-ksm.sh: Exec plugin for Kernel Samepage Merging (KSM).

Change-Id: I98d834ca849b21637c8fb00a63a037b73e0879b7

diff --git a/contrib/exec-ksm.sh b/contrib/exec-ksm.sh
new file mode 100755 (executable)
index 0000000..a21aa1d
--- /dev/null
+++ b/contrib/exec-ksm.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+
+# collectd - contrib/exec-ksm.sh
+# Copyright (C) 2011  Florian Forster
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+# DEALINGS IN THE SOFTWARE.
+#
+# Authors:
+#   Florian Forster <octo at collectd.org>
+
+HOSTNAME="${COLLECTD_HOSTNAME:-$(hostname -f)}"
+INTERVAL="${COLLECTD_INTERVAL:-60}"
+
+function read_file() {
+  local type="$1"
+  local type_instance="$2"
+  local file_name="/sys/kernel/mm/ksm/$3"
+  local ident="$HOSTNAME/exec-ksm/vmpage_number-${type_instance}"
+
+  echo "PUTVAL \"$ident\" interval=$INTERVAL N:$(< $file_name)"
+}
+
+if [[ 0 -eq $(< /sys/kernel/mm/ksm/run) ]]; then
+  echo "$0: KSM not active." >&2
+  exit 1
+fi
+
+while sleep "$INTERVAL"
+do
+  read_file vmpage_number    shared   pages_shared
+  read_file vmpage_number    saved    pages_sharing
+  read_file vmpage_number    unshared pages_unshared
+  read_file vmpage_number    volatile pages_volatile
+  read_file total_operations scan     full_scans
+done
+
+exit 0