new plugin to monitor HugePages (or Large Pages) usage under Linux

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
+}