This is the full script using also other WMI Class.

#!/usr/bin/env perl


use strict;
use warnings;


use Win32::OLE;
use Data::Dumper;


    my $class = "Win32_PerfFormattedData_PerfOS_Processor";
    my $key = 'Name';

    my @properties = qw(PercentIdleTime PercentProcessorTime PercentPr
+ivilegedTime PercentUserTime PercentInterruptTime);
    my $wmi = Win32::OLE->GetObject("winmgmts://./root/cimv2")
        or die "Failed getobject\n";

    my $list, my $v;

    $list = $wmi->InstancesOf("$class")
        or die "Failed getobject\n";
    my $hash;
    foreach $v (in $list) {        
        $hash->{$v->{$key}}->{$_}  = $v->{$_} for @properties;
    }

    print Dumper $hash;
    
    #-------------------
    # Using Otehr class    
    $class = 'Win32_PerfRawData_PerfOS_Processor';
    
    $wmi = Win32::OLE->GetObject("winmgmts://./root/cimv2")
        or die "Failed getobject\n";

    $list = $wmi->InstancesOf("$class")
        or die "Failed getobject\n";
    foreach $v (in $list) {        
        $hash->{$v->{$key}}->{$_}  = $v->{$_} for @properties;
    }

    print Dumper $hash;
[download]

output:

$VAR1 = {
          '0' => {
                   'PercentPrivilegedTime' => '0',
                   'PercentIdleTime' => '0',
                   'PercentInterruptTime' => '0',
                   'PercentUserTime' => '0',
                   'PercentProcessorTime' => '100'
                 },
          '_Total' => {
                        'PercentPrivilegedTime' => '0',
                        'PercentIdleTime' => '0',
                        'PercentInterruptTime' => '0',
                        'PercentUserTime' => '0',
                        'PercentProcessorTime' => '100'
                      }
        };
$VAR1 = {
          '0' => {
                   'PercentPrivilegedTime' => '15442905808',
                   'PercentIdleTime' => '2505024948976',
                   'PercentInterruptTime' => '1866684160',
                   'PercentUserTime' => '682681648',
                   'PercentProcessorTime' => '2505024948976'
                 },
          '_Total' => {
                        'PercentPrivilegedTime' => '15442905808',
                        'PercentIdleTime' => '2505024948976',
                        'PercentInterruptTime' => '1866684160',
                        'PercentUserTime' => '682681648',
                        'PercentProcessorTime' => '2505024948976'
                      }
        };
[download]

With the WMI class "Win32_PerfRawData_PerfOS_Processor", the value of "PercentProcessorTime" is equal to "PercentProcessorTime", i'm doing something wrong...