Add linux collection of cpu min/max.

Make cpu mhz default the current mhz.

bindings/SigarWrapper.pm

@@ -471,9 +471,19 @@ use vars qw(%classes %cmds);
       },
       {
          name => 'mhz', type => 'Int',
-         desc => 'CPU speed',
+         desc => 'Current CPU speed',
          plat => 'AFHLSW'
       },
+      {
+         name => 'mhz_max', type => 'Int',
+         desc => 'Maximum CPU speed',
+         plat => 'L'
+      },
+      {
+         name => 'mhz_min', type => 'Int',
+         desc => 'Maximum CPU speed',
+         plat => 'L'
+      },
       {
          name => 'cache_size', type => 'Long',
          desc => 'CPU cache size',

bindings/ruby/examples/cpu_info.rb

@@ -11,6 +11,8 @@ puts num.to_s + " total CPUs.."
 infos.each do |info|
     puts "Vendor........" + info.vendor
     puts "Model........." + info.model
-    puts "Mhz..........." + info.mhz.to_s
+    puts "Current Mhz..." + info.mhz.to_s
+    puts "Maximum Mhz..." + info.mhz_max.to_s
+    puts "Minimum Mhz..." + info.mhz_min.to_s
     puts "Cache size...." + info.cache_size.to_s
 end

include/sigar.h

@@ -188,6 +188,8 @@ typedef struct {
     char vendor[128];
     char model[128];
     int mhz;
+    int mhz_max;
+    int mhz_min;
     sigar_uint64_t cache_size;
     int total_sockets;
     int total_cores;

src/os/linux/linux_sigar.c

@@ -1598,7 +1598,23 @@ static void get_cpuinfo_max_freq(sigar_cpu_info_t *cpu_info, int num)
         sigar_file2str(max_freq, max_freq, sizeof(max_freq)-1);
 
     if (status == SIGAR_OK) {
-        cpu_info->mhz = atoi(max_freq) / 1000;
+        cpu_info->mhz_max = atoi(max_freq) / 1000;
+    }
+}
+
+static void get_cpuinfo_min_freq(sigar_cpu_info_t *cpu_info, int num)
+{
+    int status;
+    char min_freq[PATH_MAX];
+    snprintf(min_freq, sizeof(min_freq),
+             "/sys/devices/system/cpu/cpu%d"
+             "/cpufreq/cpuinfo_min_freq", num);
+
+    status =
+        sigar_file2str(min_freq, min_freq, sizeof(min_freq)-1);
+
+    if (status == SIGAR_OK) {
+        cpu_info->mhz_min = atoi(min_freq) / 1000;
     }
 }
 
@@ -1624,6 +1640,7 @@ int sigar_cpu_info_list_get(sigar_t *sigar,
 
         info = &cpu_infos->data[cpu_infos->number];
         get_cpuinfo_max_freq(info, cpu_infos->number);
+        get_cpuinfo_min_freq(info, cpu_infos->number);
 
         info->total_cores = sigar->ncpu;
         info->cores_per_socket = sigar->lcpu;