[disk][windows] Set EnableCounterForIoctl reg key to 1 in init() to automatically enable diskperf on Server editions

Fixes #1094

disk/disk_windows.go

@@ -12,6 +12,7 @@ import (
 
 	"github.com/shirou/gopsutil/v3/internal/common"
 	"golang.org/x/sys/windows"
+	"golang.org/x/sys/windows/registry"
 )
 
 var (
@@ -44,6 +45,14 @@ type diskPerformance struct {
 	alignmentPadding    uint32 // necessary for 32bit support, see https://github.com/elastic/beats/pull/16553
 }
 
+func init() {
+	// enable disk performance counters on Windows Server editions (needs to run as admin)
+	key, err := registry.OpenKey(registry.LOCAL_MACHINE, `SYSTEM\CurrentControlSet\Services\PartMgr`, registry.SET_VALUE)
+	if err == nil {
+		key.SetDWordValue("EnableCounterForIoctl", 1)
+	}
+}
+
 func UsageWithContext(ctx context.Context, path string) (*UsageStat, error) {
 	lpFreeBytesAvailable := int64(0)
 	lpTotalNumberOfBytes := int64(0)