From f9000cdc7a400519b128f8efc80ff765812658c7 Mon Sep 17 00:00:00 2001
From: Stefan Seidel <android@stefanseidel.info>
Date: Wed, 12 Sep 2012 10:26:59 +0200
Subject: [PATCH 1/2] new plugin to monitor HugePages (or Large Pages) usage
 under Linux

---
 plugins/system/hugepages | 47 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100755 plugins/system/hugepages

diff --git a/plugins/system/hugepages b/plugins/system/hugepages
new file mode 100755
index 00000000..de4fab6b
--- /dev/null
+++ b/plugins/system/hugepages
@@ -0,0 +1,47 @@
+#!/usr/bin/gawk --exec
+BEGIN {
+  if (ARGC > 1 && ARGV[1] == "config") {
+    print "graph_args --base 1024 -l 0"
+    print "graph_vlabel Bytes"
+    print "graph_title HugePages usage"
+    print "graph_category system"
+    print "graph_info This graph shows the usage of the kernel Huge Pages."
+    print "graph_order Total Rsvd Free Surp Anon"
+    print "Total.label used"
+    print "Total.draw AREA"
+    print "Total.info In-use Huge Page Memory"
+    print "Free.label free"
+    print "Free.draw STACK"
+    print "Free.info Unused Huge Page Memory."
+    print "Rsvd.label reserved"
+    print "Rsvd.draw STACK"
+    print "Rsvd.info Huge Pages that have been reserved but are not used."
+    print "Surp.label surplus"
+    print "Surp.draw STACK"
+    print "Surp.info Huge Pages that are in excess of the reserved amount, usually only greater than zero when the amount of Huge Pages is reduced while they are in use."
+    print "Anon.label anonymous"
+    print "Anon.draw STACK"
+    print "Anon.info Huge Pages that are in use by the transparent Huge Page allocator khugepaged."
+    CONF=1
+  }
+  ARGV[1] = "/proc/meminfo"
+  ARGC = 2
+  FS = "[: ]+"
+  OFS = ""
+  IGNORECASE = 1
+}
+
+CONF == 1 {
+  if (/Hugepagesize/) {
+    print "Total.cdef Total,Free,-,1024,",$2,",*,*"
+    print "Free.cdef Free,1024,",$2,",*,*,Rsvd,-"
+    print "Rsvd.cdef Rsvd,1024,",$2,",*,*"
+    print "Surp.cdef Surp,1024,",$2,",*,*"
+    print "Anon.cdef Anon,1024,*"
+  }
+}
+
+(CONF != 1) {
+  if (match($0,"(anon)?hugepages(_([^:]+))?[^i]",mats))
+    print mats[1],mats[3],".value ",$2
+}

From 5be6eb7253a8e33d39863837a4969062371b83ff Mon Sep 17 00:00:00 2001
From: Stefan Seidel <android@stefanseidel.info>
Date: Thu, 13 Sep 2012 08:03:19 +0200
Subject: [PATCH 2/2] add basic information and license header

---
 plugins/system/hugepages | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/plugins/system/hugepages b/plugins/system/hugepages
index de4fab6b..2b3eed4f 100755
--- a/plugins/system/hugepages
+++ b/plugins/system/hugepages
@@ -1,4 +1,37 @@
 #!/usr/bin/gawk --exec
+#
+# HugePages monitoring plugin for munin
+#
+# This plugin monitors the usage of the Linux kernel HugePages, on some
+# architectures also called  Large Pages. It will show both pre-reserved
+# pages (via /prc/sys/vm/nr_hugepages), their usage and reserved size, as
+# well as HugePages allocated by the khugepaged (activated by the
+# transparent_hugepages kernel command line parameter). All values are
+# shown in (KiBi/MeBi/GiBi)Bytes.
+#
+# This plugin is used like many other munin plugins: put it in 
+# /usr/share/munin/plugins (or another appropriate location)
+# and create a symlink in /etc/munin/plugins:
+# > ln -s /usr/share/munin/plugins/hugepages /etc/munin/plugins
+# Then restart munin-node.
+#
+#
+# --
+#  Copyright 2012 Stefan Seidel <munin@stefanseidel.info>
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+# --
+#
 BEGIN {
   if (ARGC > 1 && ARGV[1] == "config") {
     print "graph_args --base 1024 -l 0"