diff --git a/cpu.go b/cpu.go
index 83d2a97..943f35c 100644
--- a/cpu.go
+++ b/cpu.go
@@ -19,6 +19,6 @@ type CPU_TimesStat struct {
 	Stolen     float32 `json:"stolen"`
 }
 
-func Cpu_counts() (int, error) {
+func Cpu_counts(logical bool) (int, error) {
 	return runtime.NumCPU(), nil
 }
diff --git a/cpu_freebsd.go b/cpu_freebsd.go
index 06d8f4a..aeec136 100644
--- a/cpu_freebsd.go
+++ b/cpu_freebsd.go
@@ -22,7 +22,7 @@ const (
 )
 
 // TODO: get per cpus
-func Cpu_times() ([]CPU_TimesStat, error) {
+func Cpu_times(percpu bool) ([]CPU_TimesStat, error) {
 	ret := make([]CPU_TimesStat, 0)
 
 	cpu_time, err := do_sysctrl("kern.cp_time")
diff --git a/cpu_linux.go b/cpu_linux.go
index 674b9dc..60b612c 100644
--- a/cpu_linux.go
+++ b/cpu_linux.go
@@ -8,7 +8,7 @@ import (
 	"strings"
 )
 
-func Cpu_times() ([]CPU_TimesStat, error) {
+func Cpu_times(percpu bool) ([]CPU_TimesStat, error) {
 	ret := make([]CPU_TimesStat, 0)
 
 	filename := "/proc/stat"
diff --git a/cpu_test.go b/cpu_test.go
index 8a66b68..bf5abfd 100644
--- a/cpu_test.go
+++ b/cpu_test.go
@@ -5,7 +5,7 @@ import (
 )
 
 func TestCpu_times(t *testing.T) {
-	v, err := Cpu_times()
+	v, err := Cpu_times(false)
 	if err != nil {
 		t.Errorf("error %v", err)
 	}
@@ -21,7 +21,7 @@ func TestCpu_times(t *testing.T) {
 }
 
 func TestCpu_counts(t *testing.T) {
-	v, err := Cpu_counts()
+	v, err := Cpu_counts(true)
 	if err != nil {
 		t.Errorf("error %v", err)
 	}
diff --git a/cpu_windows.go b/cpu_windows.go
index ba88542..6f94aa8 100644
--- a/cpu_windows.go
+++ b/cpu_windows.go
@@ -7,7 +7,7 @@ import (
 	"unsafe"
 )
 
-func Cpu_times() ([]CPU_TimesStat, error) {
+func Cpu_times(percpu bool) ([]CPU_TimesStat, error) {
 	ret := make([]CPU_TimesStat, 0)
 
 	var lpIdleTime FILETIME
diff --git a/disk_freebsd.go b/disk_freebsd.go
index 155446a..366bacb 100644
--- a/disk_freebsd.go
+++ b/disk_freebsd.go
@@ -7,7 +7,7 @@ import (
 	"unsafe"
 )
 
-func Disk_partitions() ([]Disk_partitionStat, error) {
+func Disk_partitions(all bool) ([]Disk_partitionStat, error) {
 	ret := make([]Disk_partitionStat, 0)
 
 	// get length
diff --git a/disk_linux.go b/disk_linux.go
index e7e7827..ad7192d 100644
--- a/disk_linux.go
+++ b/disk_linux.go
@@ -2,7 +2,7 @@
 
 package gopsutil
 
-func Disk_partitions() ([]Disk_partitionStat, error) {
+func Disk_partitions(all bool) ([]Disk_partitionStat, error) {
 	ret := make([]Disk_partitionStat, 0)
 
 	return ret, nil
diff --git a/disk_test.go b/disk_test.go
index eb0453b..f7dfd68 100644
--- a/disk_test.go
+++ b/disk_test.go
@@ -21,7 +21,7 @@ func TestDisk_usage(t *testing.T) {
 }
 
 func TestDisk_partitions(t *testing.T) {
-	v, err := Disk_partitions()
+	v, err := Disk_partitions(false)
 	if err != nil {
 		t.Errorf("error %v", err)
 	}
diff --git a/disk_windows.go b/disk_windows.go
index 133eb39..8547155 100644
--- a/disk_windows.go
+++ b/disk_windows.go
@@ -44,7 +44,7 @@ func Disk_usage(path string) (Disk_usageStat, error) {
 	return ret, nil
 }
 
-func Disk_partitions() ([]Disk_partitionStat, error) {
+func Disk_partitions(all bool) ([]Disk_partitionStat, error) {
 	ret := make([]Disk_partitionStat, 0)
 	lpBuffer := make([]byte, 254)
 	diskret, _, err := procGetLogicalDriveStringsW.Call(
diff --git a/process_freebsd.go b/process_freebsd.go
index ab88e36..bca182b 100644
--- a/process_freebsd.go
+++ b/process_freebsd.go
@@ -127,7 +127,7 @@ func (p *Process) Connections() ([]Net_connectionStat, error) {
 func (p *Process) Is_running() (bool, error) {
 	return true, errors.New("Not implemented yet")
 }
-func (p *Process) Memory_Maps() (*[]Memory_mapsStat, error) {
+func (p *Process) Memory_Maps(grouped bool) (*[]Memory_mapsStat, error) {
 	ret := make([]Memory_mapsStat, 0)
 	return &ret, errors.New("Not implemented yet")
 }
diff --git a/process_linux.go b/process_linux.go
index 285a52b..a8b6fb2 100644
--- a/process_linux.go
+++ b/process_linux.go
@@ -188,7 +188,7 @@ func (p *Process) Is_running() (bool, error) {
 }
 
 // Get memory maps from /proc/(pid)/smaps
-func (p *Process) Memory_Maps() (*[]Memory_mapsStat, error) {
+func (p *Process) Memory_Maps(grouped bool) (*[]Memory_mapsStat, error) {
 	pid := p.Pid
 	ret := make([]Memory_mapsStat, 0)
 	smapsPath := filepath.Join("/", "proc", strconv.Itoa(int(pid)), "smaps")
diff --git a/process_test.go b/process_test.go
index f18b4ff..d58d1de 100644
--- a/process_test.go
+++ b/process_test.go
@@ -57,7 +57,7 @@ func Test_Process_memory_maps(t *testing.T) {
 	return
 	ret, err := NewProcess(int32(check_pid))
 
-	mmaps, err := ret.Memory_Maps()
+	mmaps, err := ret.Memory_Maps(false)
 	if err != nil {
 		t.Errorf("memory map get error %v", err)
 	}
diff --git a/process_windows.go b/process_windows.go
index b6a8ceb..50a2555 100644
--- a/process_windows.go
+++ b/process_windows.go
@@ -160,7 +160,7 @@ func (p *Process) Is_running() (bool, error) {
 	return true, errors.New("Not implemented yet")
 }
 
-func (p *Process) Memory_Maps() (*[]Memory_mapsStat, error) {
+func (p *Process) Memory_Maps(grouped bool) (*[]Memory_mapsStat, error) {
 	return nil, errors.New("Not implemented yet")
 }