implement page size function for net/openbsd and solaris/smartos

Author: Vincent Landgraf

lib/vmstat/netopenbsd.rb

@@ -8,7 +8,8 @@ def self.memory
     uvmexp = `vmstat -s`
 
     Memory.new(
-      extract_uvm_val(uvmexp, 'bytes per page'),       # pagesize
+      # pagesize call is not used to avoid double shell out
+      pagesize(uvmexp),       # pagesize
       extract_uvm_val(uvmexp, 'pages managed'),        # wired
       extract_uvm_val(uvmexp, 'pages active'),         # active
       extract_uvm_val(uvmexp, 'pages inactive'),       # inactive
@@ -18,6 +19,11 @@ def self.memory
     )
   end
 
+  def self.pagesize(uvmexp)
+    uvmexp ||= `vmstat -s`
+    extract_uvm_val(uvmexp, 'bytes per page')
+  end
+
   def self.network_interfaces
     bytes = `netstat -ibq`.lines.grep(/<Link>/) # bytes
     pkgs = `netstat -iqd`.lines.grep(/<Link>/) # packages

lib/vmstat/solaris.rb

@@ -19,12 +19,16 @@ def self.load_average
     LoadAverage.new(*uptime.gsub(/\d+(\.\d+)?/).to_a[-3..-1].map(&:to_f))
   end
 
+  def self.pagesize
+    `pagesize`.to_i
+  end
+
   def self.memory
     memstat = `echo ::memstat | mdb -k`
     vmstat = `vmstat -s`
 
     Memory.new(
-      `pagesize`.to_i, # pagesize
+      pagesize,
       # wired
       extract_solaris_mval(memstat, 'Kernel', 'Boot pages', 'ZFS File Data'),
       # active