diff --git a/api/services/tasks/v1/tasks.pb.go b/api/services/tasks/v1/tasks.pb.go
index dbd30db34..ea02cef85 100644
--- a/api/services/tasks/v1/tasks.pb.go
+++ b/api/services/tasks/v1/tasks.pb.go
@@ -26,8 +26,8 @@
 		CloseIORequest
 		PauseTaskRequest
 		ResumeTaskRequest
-		ListProcessesRequest
-		ListProcessesResponse
+		ListPidsRequest
+		ListPidsResponse
 		CheckpointTaskRequest
 		CheckpointTaskResponse
 		UpdateTaskRequest
@@ -355,21 +355,21 @@ func (m *ResumeTaskRequest) Reset()                    { *m = ResumeTaskRequest{
 func (*ResumeTaskRequest) ProtoMessage()               {}
 func (*ResumeTaskRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{16} }
 
-type ListProcessesRequest struct {
+type ListPidsRequest struct {
 	ContainerID string `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
 }
 
-func (m *ListProcessesRequest) Reset()                    { *m = ListProcessesRequest{} }
-func (*ListProcessesRequest) ProtoMessage()               {}
-func (*ListProcessesRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{17} }
+func (m *ListPidsRequest) Reset()                    { *m = ListPidsRequest{} }
+func (*ListPidsRequest) ProtoMessage()               {}
+func (*ListPidsRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{17} }
 
-type ListProcessesResponse struct {
-	Processes []*containerd_v1_types.Process `protobuf:"bytes,1,rep,name=processes" json:"processes,omitempty"`
+type ListPidsResponse struct {
+	Pids []uint32 `protobuf:"varint,1,rep,packed,name=pids" json:"pids,omitempty"`
 }
 
-func (m *ListProcessesResponse) Reset()                    { *m = ListProcessesResponse{} }
-func (*ListProcessesResponse) ProtoMessage()               {}
-func (*ListProcessesResponse) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{18} }
+func (m *ListPidsResponse) Reset()                    { *m = ListPidsResponse{} }
+func (*ListPidsResponse) ProtoMessage()               {}
+func (*ListPidsResponse) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{18} }
 
 type CheckpointTaskRequest struct {
 	ContainerID      string                                     `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
@@ -416,8 +416,8 @@ func init() {
 	proto.RegisterType((*CloseIORequest)(nil), "containerd.services.tasks.v1.CloseIORequest")
 	proto.RegisterType((*PauseTaskRequest)(nil), "containerd.services.tasks.v1.PauseTaskRequest")
 	proto.RegisterType((*ResumeTaskRequest)(nil), "containerd.services.tasks.v1.ResumeTaskRequest")
-	proto.RegisterType((*ListProcessesRequest)(nil), "containerd.services.tasks.v1.ListProcessesRequest")
-	proto.RegisterType((*ListProcessesResponse)(nil), "containerd.services.tasks.v1.ListProcessesResponse")
+	proto.RegisterType((*ListPidsRequest)(nil), "containerd.services.tasks.v1.ListPidsRequest")
+	proto.RegisterType((*ListPidsResponse)(nil), "containerd.services.tasks.v1.ListPidsResponse")
 	proto.RegisterType((*CheckpointTaskRequest)(nil), "containerd.services.tasks.v1.CheckpointTaskRequest")
 	proto.RegisterType((*CheckpointTaskResponse)(nil), "containerd.services.tasks.v1.CheckpointTaskResponse")
 	proto.RegisterType((*UpdateTaskRequest)(nil), "containerd.services.tasks.v1.UpdateTaskRequest")
@@ -450,7 +450,7 @@ type TasksClient interface {
 	CloseIO(ctx context.Context, in *CloseIORequest, opts ...grpc.CallOption) (*google_protobuf.Empty, error)
 	Pause(ctx context.Context, in *PauseTaskRequest, opts ...grpc.CallOption) (*google_protobuf.Empty, error)
 	Resume(ctx context.Context, in *ResumeTaskRequest, opts ...grpc.CallOption) (*google_protobuf.Empty, error)
-	ListProcesses(ctx context.Context, in *ListProcessesRequest, opts ...grpc.CallOption) (*ListProcessesResponse, error)
+	ListPids(ctx context.Context, in *ListPidsRequest, opts ...grpc.CallOption) (*ListPidsResponse, error)
 	Checkpoint(ctx context.Context, in *CheckpointTaskRequest, opts ...grpc.CallOption) (*CheckpointTaskResponse, error)
 	Update(ctx context.Context, in *UpdateTaskRequest, opts ...grpc.CallOption) (*google_protobuf.Empty, error)
 }
@@ -571,9 +571,9 @@ func (c *tasksClient) Resume(ctx context.Context, in *ResumeTaskRequest, opts ..
 	return out, nil
 }
 
-func (c *tasksClient) ListProcesses(ctx context.Context, in *ListProcessesRequest, opts ...grpc.CallOption) (*ListProcessesResponse, error) {
-	out := new(ListProcessesResponse)
-	err := grpc.Invoke(ctx, "/containerd.services.tasks.v1.Tasks/ListProcesses", in, out, c.cc, opts...)
+func (c *tasksClient) ListPids(ctx context.Context, in *ListPidsRequest, opts ...grpc.CallOption) (*ListPidsResponse, error) {
+	out := new(ListPidsResponse)
+	err := grpc.Invoke(ctx, "/containerd.services.tasks.v1.Tasks/ListPids", in, out, c.cc, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -617,7 +617,7 @@ type TasksServer interface {
 	CloseIO(context.Context, *CloseIORequest) (*google_protobuf.Empty, error)
 	Pause(context.Context, *PauseTaskRequest) (*google_protobuf.Empty, error)
 	Resume(context.Context, *ResumeTaskRequest) (*google_protobuf.Empty, error)
-	ListProcesses(context.Context, *ListProcessesRequest) (*ListProcessesResponse, error)
+	ListPids(context.Context, *ListPidsRequest) (*ListPidsResponse, error)
 	Checkpoint(context.Context, *CheckpointTaskRequest) (*CheckpointTaskResponse, error)
 	Update(context.Context, *UpdateTaskRequest) (*google_protobuf.Empty, error)
 }
@@ -842,20 +842,20 @@ func _Tasks_Resume_Handler(srv interface{}, ctx context.Context, dec func(interf
 	return interceptor(ctx, in, info, handler)
 }
 
-func _Tasks_ListProcesses_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(ListProcessesRequest)
+func _Tasks_ListPids_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ListPidsRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
 	if interceptor == nil {
-		return srv.(TasksServer).ListProcesses(ctx, in)
+		return srv.(TasksServer).ListPids(ctx, in)
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/containerd.services.tasks.v1.Tasks/ListProcesses",
+		FullMethod: "/containerd.services.tasks.v1.Tasks/ListPids",
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(TasksServer).ListProcesses(ctx, req.(*ListProcessesRequest))
+		return srv.(TasksServer).ListPids(ctx, req.(*ListPidsRequest))
 	}
 	return interceptor(ctx, in, info, handler)
 }
@@ -949,8 +949,8 @@ var _Tasks_serviceDesc = grpc.ServiceDesc{
 			Handler:    _Tasks_Resume_Handler,
 		},
 		{
-			MethodName: "ListProcesses",
-			Handler:    _Tasks_ListProcesses_Handler,
+			MethodName: "ListPids",
+			Handler:    _Tasks_ListPids_Handler,
 		},
 		{
 			MethodName: "Checkpoint",
@@ -1559,7 +1559,7 @@ func (m *ResumeTaskRequest) MarshalTo(dAtA []byte) (int, error) {
 	return i, nil
 }
 
-func (m *ListProcessesRequest) Marshal() (dAtA []byte, err error) {
+func (m *ListPidsRequest) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
 	n, err := m.MarshalTo(dAtA)
@@ -1569,7 +1569,7 @@ func (m *ListProcessesRequest) Marshal() (dAtA []byte, err error) {
 	return dAtA[:n], nil
 }
 
-func (m *ListProcessesRequest) MarshalTo(dAtA []byte) (int, error) {
+func (m *ListPidsRequest) MarshalTo(dAtA []byte) (int, error) {
 	var i int
 	_ = i
 	var l int
@@ -1583,7 +1583,7 @@ func (m *ListProcessesRequest) MarshalTo(dAtA []byte) (int, error) {
 	return i, nil
 }
 
-func (m *ListProcessesResponse) Marshal() (dAtA []byte, err error) {
+func (m *ListPidsResponse) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
 	n, err := m.MarshalTo(dAtA)
@@ -1593,22 +1593,27 @@ func (m *ListProcessesResponse) Marshal() (dAtA []byte, err error) {
 	return dAtA[:n], nil
 }
 
-func (m *ListProcessesResponse) MarshalTo(dAtA []byte) (int, error) {
+func (m *ListPidsResponse) MarshalTo(dAtA []byte) (int, error) {
 	var i int
 	_ = i
 	var l int
 	_ = l
-	if len(m.Processes) > 0 {
-		for _, msg := range m.Processes {
-			dAtA[i] = 0xa
-			i++
-			i = encodeVarintTasks(dAtA, i, uint64(msg.Size()))
-			n, err := msg.MarshalTo(dAtA[i:])
-			if err != nil {
-				return 0, err
+	if len(m.Pids) > 0 {
+		dAtA7 := make([]byte, len(m.Pids)*10)
+		var j6 int
+		for _, num := range m.Pids {
+			for num >= 1<<7 {
+				dAtA7[j6] = uint8(uint64(num)&0x7f | 0x80)
+				num >>= 7
+				j6++
 			}
-			i += n
+			dAtA7[j6] = uint8(num)
+			j6++
 		}
+		dAtA[i] = 0xa
+		i++
+		i = encodeVarintTasks(dAtA, i, uint64(j6))
+		i += copy(dAtA[i:], dAtA7[:j6])
 	}
 	return i, nil
 }
@@ -1715,11 +1720,11 @@ func (m *UpdateTaskRequest) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0x12
 		i++
 		i = encodeVarintTasks(dAtA, i, uint64(m.Resources.Size()))
-		n6, err := m.Resources.MarshalTo(dAtA[i:])
+		n8, err := m.Resources.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n6
+		i += n8
 	}
 	return i, nil
 }
@@ -2013,7 +2018,7 @@ func (m *ResumeTaskRequest) Size() (n int) {
 	return n
 }
 
-func (m *ListProcessesRequest) Size() (n int) {
+func (m *ListPidsRequest) Size() (n int) {
 	var l int
 	_ = l
 	l = len(m.ContainerID)
@@ -2023,14 +2028,15 @@ func (m *ListProcessesRequest) Size() (n int) {
 	return n
 }
 
-func (m *ListProcessesResponse) Size() (n int) {
+func (m *ListPidsResponse) Size() (n int) {
 	var l int
 	_ = l
-	if len(m.Processes) > 0 {
-		for _, e := range m.Processes {
-			l = e.Size()
-			n += 1 + l + sovTasks(uint64(l))
+	if len(m.Pids) > 0 {
+		l = 0
+		for _, e := range m.Pids {
+			l += sovTasks(uint64(e))
 		}
+		n += 1 + sovTasks(uint64(l)) + l
 	}
 	return n
 }
@@ -2309,22 +2315,22 @@ func (this *ResumeTaskRequest) String() string {
 	}, "")
 	return s
 }
-func (this *ListProcessesRequest) String() string {
+func (this *ListPidsRequest) String() string {
 	if this == nil {
 		return "nil"
 	}
-	s := strings.Join([]string{`&ListProcessesRequest{`,
+	s := strings.Join([]string{`&ListPidsRequest{`,
 		`ContainerID:` + fmt.Sprintf("%v", this.ContainerID) + `,`,
 		`}`,
 	}, "")
 	return s
 }
-func (this *ListProcessesResponse) String() string {
+func (this *ListPidsResponse) String() string {
 	if this == nil {
 		return "nil"
 	}
-	s := strings.Join([]string{`&ListProcessesResponse{`,
-		`Processes:` + strings.Replace(fmt.Sprintf("%v", this.Processes), "Process", "containerd_v1_types.Process", 1) + `,`,
+	s := strings.Join([]string{`&ListPidsResponse{`,
+		`Pids:` + fmt.Sprintf("%v", this.Pids) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -4292,7 +4298,7 @@ func (m *ResumeTaskRequest) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
-func (m *ListProcessesRequest) Unmarshal(dAtA []byte) error {
+func (m *ListPidsRequest) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0
 	for iNdEx < l {
@@ -4315,10 +4321,10 @@ func (m *ListProcessesRequest) Unmarshal(dAtA []byte) error {
 		fieldNum := int32(wire >> 3)
 		wireType := int(wire & 0x7)
 		if wireType == 4 {
-			return fmt.Errorf("proto: ListProcessesRequest: wiretype end group for non-group")
+			return fmt.Errorf("proto: ListPidsRequest: wiretype end group for non-group")
 		}
 		if fieldNum <= 0 {
-			return fmt.Errorf("proto: ListProcessesRequest: illegal tag %d (wire type %d)", fieldNum, wire)
+			return fmt.Errorf("proto: ListPidsRequest: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
 		case 1:
@@ -4371,7 +4377,7 @@ func (m *ListProcessesRequest) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
-func (m *ListProcessesResponse) Unmarshal(dAtA []byte) error {
+func (m *ListPidsResponse) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0
 	for iNdEx < l {
@@ -4394,43 +4400,74 @@ func (m *ListProcessesResponse) Unmarshal(dAtA []byte) error {
 		fieldNum := int32(wire >> 3)
 		wireType := int(wire & 0x7)
 		if wireType == 4 {
-			return fmt.Errorf("proto: ListProcessesResponse: wiretype end group for non-group")
+			return fmt.Errorf("proto: ListPidsResponse: wiretype end group for non-group")
 		}
 		if fieldNum <= 0 {
-			return fmt.Errorf("proto: ListProcessesResponse: illegal tag %d (wire type %d)", fieldNum, wire)
+			return fmt.Errorf("proto: ListPidsResponse: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
 		case 1:
-			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Processes", wireType)
-			}
-			var msglen int
-			for shift := uint(0); ; shift += 7 {
-				if shift >= 64 {
-					return ErrIntOverflowTasks
+			if wireType == 0 {
+				var v uint32
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return ErrIntOverflowTasks
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					v |= (uint32(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
 				}
-				if iNdEx >= l {
+				m.Pids = append(m.Pids, v)
+			} else if wireType == 2 {
+				var packedLen int
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return ErrIntOverflowTasks
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					packedLen |= (int(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				if packedLen < 0 {
+					return ErrInvalidLengthTasks
+				}
+				postIndex := iNdEx + packedLen
+				if postIndex > l {
 					return io.ErrUnexpectedEOF
 				}
-				b := dAtA[iNdEx]
-				iNdEx++
-				msglen |= (int(b) & 0x7F) << shift
-				if b < 0x80 {
-					break
+				for iNdEx < postIndex {
+					var v uint32
+					for shift := uint(0); ; shift += 7 {
+						if shift >= 64 {
+							return ErrIntOverflowTasks
+						}
+						if iNdEx >= l {
+							return io.ErrUnexpectedEOF
+						}
+						b := dAtA[iNdEx]
+						iNdEx++
+						v |= (uint32(b) & 0x7F) << shift
+						if b < 0x80 {
+							break
+						}
+					}
+					m.Pids = append(m.Pids, v)
 				}
+			} else {
+				return fmt.Errorf("proto: wrong wireType = %d for field Pids", wireType)
 			}
-			if msglen < 0 {
-				return ErrInvalidLengthTasks
-			}
-			postIndex := iNdEx + msglen
-			if postIndex > l {
-				return io.ErrUnexpectedEOF
-			}
-			m.Processes = append(m.Processes, &containerd_v1_types.Process{})
-			if err := m.Processes[len(m.Processes)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
-				return err
-			}
-			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipTasks(dAtA[iNdEx:])
@@ -4979,82 +5016,82 @@ func init() {
 }
 
 var fileDescriptorTasks = []byte{
-	// 1231 bytes of a gzipped FileDescriptorProto
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-	0xa1, 0x06, 0x6d, 0x11, 0x11, 0x03, 0x60, 0xa4, 0x63, 0x4e, 0x41, 0xdb, 0x30, 0xcb, 0x6e, 0xd8,
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+	0x1b, 0x72, 0x7c, 0x2d, 0x40, 0xef, 0x4d, 0x16, 0x4c, 0xac, 0x0e, 0x63, 0x73, 0xde, 0x81, 0x1c,
+	0x47, 0x3e, 0x94, 0x52, 0x7e, 0xa3, 0x98, 0xaf, 0xaf, 0x5f, 0x42, 0x42, 0xd9, 0xbd, 0x07, 0xf3,
+	0x31, 0x78, 0xa6, 0x45, 0x69, 0x18, 0x65, 0xc7, 0x7a, 0xb0, 0x03, 0x37, 0x14, 0x12, 0xa6, 0x65,
+	0xf7, 0x22, 0x60, 0x4e, 0x50, 0x98, 0x17, 0x60, 0x97, 0x66, 0xe1, 0x30, 0x22, 0x8e, 0x55, 0xf8,
+	0x0c, 0x0a, 0x12, 0xf5, 0xd2, 0xfa, 0x6a, 0x04, 0x1b, 0xc7, 0xaa, 0x24, 0x50, 0x1c, 0x00, 0x17,
+	0x5a, 0x4b, 0x2f, 0x9f, 0x04, 0x4e, 0xea, 0xe6, 0xb4, 0xec, 0x2a, 0x69, 0x2f, 0x01, 0x12, 0xd0,
+	0x72, 0xff, 0x0a, 0x48, 0xa2, 0x7f, 0x78, 0x39, 0x21, 0xf5, 0xf0, 0x33, 0x28, 0xc8, 0x99, 0x9e,
+	0x16, 0xb6, 0x91, 0xc9, 0x3f, 0x2e, 0x6c, 0x1b, 0x5f, 0x9f, 0xbc, 0xae, 0xcc, 0xfd, 0xf5, 0xba,
+	0x32, 0xf7, 0xc3, 0x59, 0x45, 0x3b, 0x39, 0xab, 0x68, 0x7f, 0x9c, 0x55, 0xb4, 0x7f, 0xcf, 0x2a,
+	0xda, 0xfe, 0xa3, 0xab, 0xfd, 0x12, 0xf2, 0x50, 0x1c, 0x0e, 0x0a, 0xe2, 0x9d, 0xfb, 0xff, 0x05,
+	0x00, 0x00, 0xff, 0xff, 0x29, 0x59, 0x7a, 0x4c, 0x50, 0x11, 0x00, 0x00,
 }
diff --git a/api/services/tasks/v1/tasks.proto b/api/services/tasks/v1/tasks.proto
index d248d4df7..e46fc3ffa 100644
--- a/api/services/tasks/v1/tasks.proto
+++ b/api/services/tasks/v1/tasks.proto
@@ -41,7 +41,7 @@ service Tasks {
 
 	rpc Resume(ResumeTaskRequest) returns (google.protobuf.Empty);
 
-	rpc ListProcesses(ListProcessesRequest) returns (ListProcessesResponse);
+	rpc ListPids(ListPidsRequest) returns (ListPidsResponse);
 
 	rpc Checkpoint(CheckpointTaskRequest) returns (CheckpointTaskResponse);
 
@@ -173,12 +173,12 @@ message ResumeTaskRequest {
 	string container_id = 1;
 }
 
-message ListProcessesRequest {
+message ListPidsRequest {
 	string container_id = 1;
 }
 
-message ListProcessesResponse{
-	repeated containerd.v1.types.Process processes = 1;
+message ListPidsResponse{
+	repeated uint32 pids = 1;
 }
 
 message CheckpointTaskRequest {
diff --git a/linux/shim/local.go b/linux/shim/local.go
index 3fcffe0b3..493215db1 100644
--- a/linux/shim/local.go
+++ b/linux/shim/local.go
@@ -76,8 +76,8 @@ func (c *local) Kill(ctx context.Context, in *shimapi.KillRequest, opts ...grpc.
 	return c.s.Kill(ctx, in)
 }
 
-func (c *local) ListProcesses(ctx context.Context, in *shimapi.ListProcessesRequest, opts ...grpc.CallOption) (*shimapi.ListProcessesResponse, error) {
-	return c.s.ListProcesses(ctx, in)
+func (c *local) ListPids(ctx context.Context, in *shimapi.ListPidsRequest, opts ...grpc.CallOption) (*shimapi.ListPidsResponse, error) {
+	return c.s.ListPids(ctx, in)
 }
 
 func (c *local) CloseIO(ctx context.Context, in *shimapi.CloseIORequest, opts ...grpc.CallOption) (*google_protobuf.Empty, error) {
diff --git a/linux/shim/service.go b/linux/shim/service.go
index bfda93d50..96d882473 100644
--- a/linux/shim/service.go
+++ b/linux/shim/service.go
@@ -321,21 +321,14 @@ func (s *Service) Kill(ctx context.Context, r *shimapi.KillRequest) (*google_pro
 	return empty, nil
 }
 
-func (s *Service) ListProcesses(ctx context.Context, r *shimapi.ListProcessesRequest) (*shimapi.ListProcessesResponse, error) {
+func (s *Service) ListPids(ctx context.Context, r *shimapi.ListPidsRequest) (*shimapi.ListPidsResponse, error) {
 	pids, err := s.getContainerPids(ctx, r.ID)
 	if err != nil {
 		return nil, err
 	}
-	ps := []*task.Process{}
-	for _, pid := range pids {
-		ps = append(ps, &task.Process{
-			Pid: pid,
-		})
-	}
-	resp := &shimapi.ListProcessesResponse{
-		Processes: ps,
-	}
-	return resp, nil
+	return &shimapi.ListPidsResponse{
+		Pids: pids,
+	}, nil
 }
 
 func (s *Service) CloseIO(ctx context.Context, r *shimapi.CloseIORequest) (*google_protobuf.Empty, error) {
diff --git a/linux/shim/v1/shim.pb.go b/linux/shim/v1/shim.pb.go
index 2bed15915..b96c8e06a 100644
--- a/linux/shim/v1/shim.pb.go
+++ b/linux/shim/v1/shim.pb.go
@@ -19,8 +19,8 @@
 		StateResponse
 		KillRequest
 		CloseIORequest
-		ListProcessesRequest
-		ListProcessesResponse
+		ListPidsRequest
+		ListPidsResponse
 		CheckpointTaskRequest
 		ShimInfoResponse
 		StreamEventsRequest
@@ -174,21 +174,21 @@ func (m *CloseIORequest) Reset()                    { *m = CloseIORequest{} }
 func (*CloseIORequest) ProtoMessage()               {}
 func (*CloseIORequest) Descriptor() ([]byte, []int) { return fileDescriptorShim, []int{9} }
 
-type ListProcessesRequest struct {
+type ListPidsRequest struct {
 	ID string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
 }
 
-func (m *ListProcessesRequest) Reset()                    { *m = ListProcessesRequest{} }
-func (*ListProcessesRequest) ProtoMessage()               {}
-func (*ListProcessesRequest) Descriptor() ([]byte, []int) { return fileDescriptorShim, []int{10} }
+func (m *ListPidsRequest) Reset()                    { *m = ListPidsRequest{} }
+func (*ListPidsRequest) ProtoMessage()               {}
+func (*ListPidsRequest) Descriptor() ([]byte, []int) { return fileDescriptorShim, []int{10} }
 
-type ListProcessesResponse struct {
-	Processes []*containerd_v1_types.Process `protobuf:"bytes,1,rep,name=processes" json:"processes,omitempty"`
+type ListPidsResponse struct {
+	Pids []uint32 `protobuf:"varint,1,rep,packed,name=pids" json:"pids,omitempty"`
 }
 
-func (m *ListProcessesResponse) Reset()                    { *m = ListProcessesResponse{} }
-func (*ListProcessesResponse) ProtoMessage()               {}
-func (*ListProcessesResponse) Descriptor() ([]byte, []int) { return fileDescriptorShim, []int{11} }
+func (m *ListPidsResponse) Reset()                    { *m = ListPidsResponse{} }
+func (*ListPidsResponse) ProtoMessage()               {}
+func (*ListPidsResponse) Descriptor() ([]byte, []int) { return fileDescriptorShim, []int{11} }
 
 type CheckpointTaskRequest struct {
 	Path    string            `protobuf:"bytes,1,opt,name=path,proto3" json:"path,omitempty"`
@@ -233,8 +233,8 @@ func init() {
 	proto.RegisterType((*StateResponse)(nil), "containerd.runtime.linux.shim.v1.StateResponse")
 	proto.RegisterType((*KillRequest)(nil), "containerd.runtime.linux.shim.v1.KillRequest")
 	proto.RegisterType((*CloseIORequest)(nil), "containerd.runtime.linux.shim.v1.CloseIORequest")
-	proto.RegisterType((*ListProcessesRequest)(nil), "containerd.runtime.linux.shim.v1.ListProcessesRequest")
-	proto.RegisterType((*ListProcessesResponse)(nil), "containerd.runtime.linux.shim.v1.ListProcessesResponse")
+	proto.RegisterType((*ListPidsRequest)(nil), "containerd.runtime.linux.shim.v1.ListPidsRequest")
+	proto.RegisterType((*ListPidsResponse)(nil), "containerd.runtime.linux.shim.v1.ListPidsResponse")
 	proto.RegisterType((*CheckpointTaskRequest)(nil), "containerd.runtime.linux.shim.v1.CheckpointTaskRequest")
 	proto.RegisterType((*ShimInfoResponse)(nil), "containerd.runtime.linux.shim.v1.ShimInfoResponse")
 	proto.RegisterType((*StreamEventsRequest)(nil), "containerd.runtime.linux.shim.v1.StreamEventsRequest")
@@ -258,7 +258,7 @@ type ShimClient interface {
 	Start(ctx context.Context, in *google_protobuf1.Empty, opts ...grpc.CallOption) (*google_protobuf1.Empty, error)
 	Delete(ctx context.Context, in *google_protobuf1.Empty, opts ...grpc.CallOption) (*DeleteResponse, error)
 	DeleteProcess(ctx context.Context, in *DeleteProcessRequest, opts ...grpc.CallOption) (*DeleteResponse, error)
-	ListProcesses(ctx context.Context, in *ListProcessesRequest, opts ...grpc.CallOption) (*ListProcessesResponse, error)
+	ListPids(ctx context.Context, in *ListPidsRequest, opts ...grpc.CallOption) (*ListPidsResponse, error)
 	Pause(ctx context.Context, in *google_protobuf1.Empty, opts ...grpc.CallOption) (*google_protobuf1.Empty, error)
 	Resume(ctx context.Context, in *google_protobuf1.Empty, opts ...grpc.CallOption) (*google_protobuf1.Empty, error)
 	Checkpoint(ctx context.Context, in *CheckpointTaskRequest, opts ...grpc.CallOption) (*google_protobuf1.Empty, error)
@@ -325,9 +325,9 @@ func (c *shimClient) DeleteProcess(ctx context.Context, in *DeleteProcessRequest
 	return out, nil
 }
 
-func (c *shimClient) ListProcesses(ctx context.Context, in *ListProcessesRequest, opts ...grpc.CallOption) (*ListProcessesResponse, error) {
-	out := new(ListProcessesResponse)
-	err := grpc.Invoke(ctx, "/containerd.runtime.linux.shim.v1.Shim/ListProcesses", in, out, c.cc, opts...)
+func (c *shimClient) ListPids(ctx context.Context, in *ListPidsRequest, opts ...grpc.CallOption) (*ListPidsResponse, error) {
+	out := new(ListPidsResponse)
+	err := grpc.Invoke(ctx, "/containerd.runtime.linux.shim.v1.Shim/ListPids", in, out, c.cc, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -456,7 +456,7 @@ type ShimServer interface {
 	Start(context.Context, *google_protobuf1.Empty) (*google_protobuf1.Empty, error)
 	Delete(context.Context, *google_protobuf1.Empty) (*DeleteResponse, error)
 	DeleteProcess(context.Context, *DeleteProcessRequest) (*DeleteResponse, error)
-	ListProcesses(context.Context, *ListProcessesRequest) (*ListProcessesResponse, error)
+	ListPids(context.Context, *ListPidsRequest) (*ListPidsResponse, error)
 	Pause(context.Context, *google_protobuf1.Empty) (*google_protobuf1.Empty, error)
 	Resume(context.Context, *google_protobuf1.Empty) (*google_protobuf1.Empty, error)
 	Checkpoint(context.Context, *CheckpointTaskRequest) (*google_protobuf1.Empty, error)
@@ -564,20 +564,20 @@ func _Shim_DeleteProcess_Handler(srv interface{}, ctx context.Context, dec func(
 	return interceptor(ctx, in, info, handler)
 }
 
-func _Shim_ListProcesses_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(ListProcessesRequest)
+func _Shim_ListPids_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ListPidsRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
 	if interceptor == nil {
-		return srv.(ShimServer).ListProcesses(ctx, in)
+		return srv.(ShimServer).ListPids(ctx, in)
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/containerd.runtime.linux.shim.v1.Shim/ListProcesses",
+		FullMethod: "/containerd.runtime.linux.shim.v1.Shim/ListPids",
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(ShimServer).ListProcesses(ctx, req.(*ListProcessesRequest))
+		return srv.(ShimServer).ListPids(ctx, req.(*ListPidsRequest))
 	}
 	return interceptor(ctx, in, info, handler)
 }
@@ -790,8 +790,8 @@ var _Shim_serviceDesc = grpc.ServiceDesc{
 			Handler:    _Shim_DeleteProcess_Handler,
 		},
 		{
-			MethodName: "ListProcesses",
-			Handler:    _Shim_ListProcesses_Handler,
+			MethodName: "ListPids",
+			Handler:    _Shim_ListPids_Handler,
 		},
 		{
 			MethodName: "Pause",
@@ -1273,7 +1273,7 @@ func (m *CloseIORequest) MarshalTo(dAtA []byte) (int, error) {
 	return i, nil
 }
 
-func (m *ListProcessesRequest) Marshal() (dAtA []byte, err error) {
+func (m *ListPidsRequest) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
 	n, err := m.MarshalTo(dAtA)
@@ -1283,7 +1283,7 @@ func (m *ListProcessesRequest) Marshal() (dAtA []byte, err error) {
 	return dAtA[:n], nil
 }
 
-func (m *ListProcessesRequest) MarshalTo(dAtA []byte) (int, error) {
+func (m *ListPidsRequest) MarshalTo(dAtA []byte) (int, error) {
 	var i int
 	_ = i
 	var l int
@@ -1297,7 +1297,7 @@ func (m *ListProcessesRequest) MarshalTo(dAtA []byte) (int, error) {
 	return i, nil
 }
 
-func (m *ListProcessesResponse) Marshal() (dAtA []byte, err error) {
+func (m *ListPidsResponse) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
 	n, err := m.MarshalTo(dAtA)
@@ -1307,22 +1307,27 @@ func (m *ListProcessesResponse) Marshal() (dAtA []byte, err error) {
 	return dAtA[:n], nil
 }
 
-func (m *ListProcessesResponse) MarshalTo(dAtA []byte) (int, error) {
+func (m *ListPidsResponse) MarshalTo(dAtA []byte) (int, error) {
 	var i int
 	_ = i
 	var l int
 	_ = l
-	if len(m.Processes) > 0 {
-		for _, msg := range m.Processes {
-			dAtA[i] = 0xa
-			i++
-			i = encodeVarintShim(dAtA, i, uint64(msg.Size()))
-			n, err := msg.MarshalTo(dAtA[i:])
-			if err != nil {
-				return 0, err
+	if len(m.Pids) > 0 {
+		dAtA4 := make([]byte, len(m.Pids)*10)
+		var j3 int
+		for _, num := range m.Pids {
+			for num >= 1<<7 {
+				dAtA4[j3] = uint8(uint64(num)&0x7f | 0x80)
+				num >>= 7
+				j3++
 			}
-			i += n
+			dAtA4[j3] = uint8(num)
+			j3++
 		}
+		dAtA[i] = 0xa
+		i++
+		i = encodeVarintShim(dAtA, i, uint64(j3))
+		i += copy(dAtA[i:], dAtA4[:j3])
 	}
 	return i, nil
 }
@@ -1428,11 +1433,11 @@ func (m *UpdateTaskRequest) MarshalTo(dAtA []byte) (int, error) {
 		dAtA[i] = 0xa
 		i++
 		i = encodeVarintShim(dAtA, i, uint64(m.Resources.Size()))
-		n3, err := m.Resources.MarshalTo(dAtA[i:])
+		n5, err := m.Resources.MarshalTo(dAtA[i:])
 		if err != nil {
 			return 0, err
 		}
-		i += n3
+		i += n5
 	}
 	return i, nil
 }
@@ -1660,7 +1665,7 @@ func (m *CloseIORequest) Size() (n int) {
 	return n
 }
 
-func (m *ListProcessesRequest) Size() (n int) {
+func (m *ListPidsRequest) Size() (n int) {
 	var l int
 	_ = l
 	l = len(m.ID)
@@ -1670,14 +1675,15 @@ func (m *ListProcessesRequest) Size() (n int) {
 	return n
 }
 
-func (m *ListProcessesResponse) Size() (n int) {
+func (m *ListPidsResponse) Size() (n int) {
 	var l int
 	_ = l
-	if len(m.Processes) > 0 {
-		for _, e := range m.Processes {
-			l = e.Size()
-			n += 1 + l + sovShim(uint64(l))
+	if len(m.Pids) > 0 {
+		l = 0
+		for _, e := range m.Pids {
+			l += sovShim(uint64(e))
 		}
+		n += 1 + sovShim(uint64(l)) + l
 	}
 	return n
 }
@@ -1866,22 +1872,22 @@ func (this *CloseIORequest) String() string {
 	}, "")
 	return s
 }
-func (this *ListProcessesRequest) String() string {
+func (this *ListPidsRequest) String() string {
 	if this == nil {
 		return "nil"
 	}
-	s := strings.Join([]string{`&ListProcessesRequest{`,
+	s := strings.Join([]string{`&ListPidsRequest{`,
 		`ID:` + fmt.Sprintf("%v", this.ID) + `,`,
 		`}`,
 	}, "")
 	return s
 }
-func (this *ListProcessesResponse) String() string {
+func (this *ListPidsResponse) String() string {
 	if this == nil {
 		return "nil"
 	}
-	s := strings.Join([]string{`&ListProcessesResponse{`,
-		`Processes:` + strings.Replace(fmt.Sprintf("%v", this.Processes), "Process", "containerd_v1_types.Process", 1) + `,`,
+	s := strings.Join([]string{`&ListPidsResponse{`,
+		`Pids:` + fmt.Sprintf("%v", this.Pids) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -3380,7 +3386,7 @@ func (m *CloseIORequest) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
-func (m *ListProcessesRequest) Unmarshal(dAtA []byte) error {
+func (m *ListPidsRequest) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0
 	for iNdEx < l {
@@ -3403,10 +3409,10 @@ func (m *ListProcessesRequest) Unmarshal(dAtA []byte) error {
 		fieldNum := int32(wire >> 3)
 		wireType := int(wire & 0x7)
 		if wireType == 4 {
-			return fmt.Errorf("proto: ListProcessesRequest: wiretype end group for non-group")
+			return fmt.Errorf("proto: ListPidsRequest: wiretype end group for non-group")
 		}
 		if fieldNum <= 0 {
-			return fmt.Errorf("proto: ListProcessesRequest: illegal tag %d (wire type %d)", fieldNum, wire)
+			return fmt.Errorf("proto: ListPidsRequest: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
 		case 1:
@@ -3459,7 +3465,7 @@ func (m *ListProcessesRequest) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
-func (m *ListProcessesResponse) Unmarshal(dAtA []byte) error {
+func (m *ListPidsResponse) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0
 	for iNdEx < l {
@@ -3482,43 +3488,74 @@ func (m *ListProcessesResponse) Unmarshal(dAtA []byte) error {
 		fieldNum := int32(wire >> 3)
 		wireType := int(wire & 0x7)
 		if wireType == 4 {
-			return fmt.Errorf("proto: ListProcessesResponse: wiretype end group for non-group")
+			return fmt.Errorf("proto: ListPidsResponse: wiretype end group for non-group")
 		}
 		if fieldNum <= 0 {
-			return fmt.Errorf("proto: ListProcessesResponse: illegal tag %d (wire type %d)", fieldNum, wire)
+			return fmt.Errorf("proto: ListPidsResponse: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
 		case 1:
-			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Processes", wireType)
-			}
-			var msglen int
-			for shift := uint(0); ; shift += 7 {
-				if shift >= 64 {
-					return ErrIntOverflowShim
+			if wireType == 0 {
+				var v uint32
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return ErrIntOverflowShim
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					v |= (uint32(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
 				}
-				if iNdEx >= l {
+				m.Pids = append(m.Pids, v)
+			} else if wireType == 2 {
+				var packedLen int
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return ErrIntOverflowShim
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					packedLen |= (int(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				if packedLen < 0 {
+					return ErrInvalidLengthShim
+				}
+				postIndex := iNdEx + packedLen
+				if postIndex > l {
 					return io.ErrUnexpectedEOF
 				}
-				b := dAtA[iNdEx]
-				iNdEx++
-				msglen |= (int(b) & 0x7F) << shift
-				if b < 0x80 {
-					break
+				for iNdEx < postIndex {
+					var v uint32
+					for shift := uint(0); ; shift += 7 {
+						if shift >= 64 {
+							return ErrIntOverflowShim
+						}
+						if iNdEx >= l {
+							return io.ErrUnexpectedEOF
+						}
+						b := dAtA[iNdEx]
+						iNdEx++
+						v |= (uint32(b) & 0x7F) << shift
+						if b < 0x80 {
+							break
+						}
+					}
+					m.Pids = append(m.Pids, v)
 				}
+			} else {
+				return fmt.Errorf("proto: wrong wireType = %d for field Pids", wireType)
 			}
-			if msglen < 0 {
-				return ErrInvalidLengthShim
-			}
-			postIndex := iNdEx + msglen
-			if postIndex > l {
-				return io.ErrUnexpectedEOF
-			}
-			m.Processes = append(m.Processes, &containerd_v1_types.Process{})
-			if err := m.Processes[len(m.Processes)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
-				return err
-			}
-			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipShim(dAtA[iNdEx:])
@@ -4047,77 +4084,77 @@ func init() {
 }
 
 var fileDescriptorShim = []byte{
-	// 1143 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xac, 0x57, 0xcd, 0x6e, 0xdb, 0xc6,
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+	0x7a, 0xf1, 0x9f, 0x31, 0x4c, 0x53, 0xb0, 0x2c, 0x1f, 0xa4, 0x7f, 0x0c, 0xef, 0x7f, 0x49, 0x28,
+	0x6b, 0x13, 0x87, 0x4e, 0xe9, 0x71, 0xfa, 0x43, 0x58, 0x4e, 0x55, 0x65, 0x60, 0x11, 0x94, 0x02,
+	0xe2, 0x50, 0x4d, 0xd9, 0x28, 0x36, 0x6b, 0x96, 0x58, 0xeb, 0x7f, 0x28, 0x70, 0x2f, 0x6d, 0x04,
+	0xd9, 0xee, 0xc9, 0xb5, 0x6d, 0xd6, 0x8b, 0x6d, 0x5b, 0x62, 0x8d, 0xbe, 0x83, 0x45, 0x3f, 0x60,
+	0xc4, 0xf7, 0x78, 0x59, 0xf3, 0x08, 0x1d, 0x18, 0xd3, 0xa6, 0x98, 0x71, 0xab, 0x75, 0xe3, 0x45,
+	0x6c, 0xe6, 0xd0, 0x63, 0xe1, 0xd0, 0x4a, 0x8c, 0xd6, 0x77, 0xe0, 0xbd, 0xec, 0x01, 0x27, 0xe6,
+	0x02, 0x0f, 0xa5, 0x0b, 0x7c, 0xc9, 0x89, 0x19, 0xd8, 0x6e, 0x94, 0xe4, 0x60, 0x2c, 0xec, 0x14,
+	0xb6, 0x15, 0xfd, 0x31, 0x2c, 0x9f, 0xf4, 0x48, 0xff, 0xc8, 0x3b, 0xf7, 0x6f, 0x5e, 0x7c, 0x1f,
+	0xca, 0xdc, 0x8d, 0xd3, 0x94, 0xdd, 0x45, 0x2e, 0xb7, 0x89, 0xa3, 0xdf, 0x83, 0xbb, 0x27, 0x2c,
+	0xc4, 0x76, 0xff, 0x50, 0xcc, 0x14, 0xe9, 0x97, 0xfe, 0x39, 0xac, 0xbc, 0x0a, 0x9c, 0xb1, 0x41,
+	0xd2, 0x82, 0x4a, 0x88, 0xa9, 0x1f, 0x85, 0x1d, 0x4c, 0x85, 0x9d, 0xbc, 0x7a, 0x4e, 0xd5, 0x5a,
+	0xbf, 0x55, 0xa1, 0xc4, 0xfd, 0x41, 0x6d, 0x58, 0x10, 0xf5, 0x85, 0xd6, 0x26, 0x20, 0x87, 0x7c,
+	0x68, 0xd7, 0xcd, 0xe9, 0x1c, 0x8e, 0x16, 0x28, 0x05, 0x35, 0xee, 0xd6, 0x68, 0x6b, 0x06, 0xfa,
+	0xc7, 0xc7, 0x62, 0xfd, 0x93, 0xf9, 0x40, 0xf2, 0xd2, 0xe7, 0xe2, 0x19, 0x21, 0xcb, 0x7d, 0x46,
+	0xce, 0x3e, 0xb2, 0x40, 0x8d, 0x5b, 0x75, 0x2e, 0xf2, 0xc9, 0x74, 0x87, 0xc6, 0x86, 0xce, 0x10,
+	0x6a, 0x23, 0xed, 0x1f, 0x3d, 0x9b, 0xd5, 0xc4, 0xe8, 0x18, 0x78, 0x87, 0xab, 0x5f, 0x43, 0x39,
+	0x29, 0x2c, 0xb4, 0x39, 0x1d, 0x3d, 0x56, 0xaf, 0xf5, 0xd6, 0x3c, 0x90, 0x94, 0xfa, 0xb6, 0x1d,
+	0x51, 0x3c, 0x37, 0xf5, 0xdb, 0xa0, 0x5a, 0x98, 0x46, 0xfd, 0xf9, 0x91, 0xdf, 0x02, 0xa4, 0x75,
+	0x8b, 0x9e, 0xbf, 0x63, 0x95, 0xe7, 0x9a, 0xf7, 0x40, 0x8d, 0x8b, 0x0f, 0x3d, 0x9d, 0x25, 0xf9,
+	0x27, 0xca, 0xb4, 0xfe, 0x28, 0x0b, 0x4b, 0x3e, 0x0f, 0x8d, 0xf8, 0xf3, 0x90, 0x63, 0xac, 0xd8,
+	0x92, 0x00, 0x3d, 0x51, 0xd0, 0x31, 0x94, 0x78, 0xf7, 0x46, 0x8f, 0xa7, 0xdf, 0x96, 0xe9, 0xf2,
+	0xb9, 0xee, 0x53, 0x28, 0xf1, 0x81, 0x8d, 0x66, 0xa8, 0xa4, 0xc9, 0x4f, 0x8f, 0xfa, 0xd3, 0x39,
+	0x51, 0x32, 0x0b, 0xbe, 0x86, 0xca, 0xcd, 0xf0, 0x47, 0x33, 0xa4, 0xd1, 0xf8, 0x97, 0x42, 0xee,
+	0x6b, 0x4e, 0x60, 0x51, 0xce, 0x23, 0x34, 0x43, 0x39, 0x8c, 0x8e, 0xae, 0x5c, 0xa3, 0x5f, 0x41,
+	0x39, 0xe9, 0xc6, 0xb9, 0xc9, 0x37, 0xc3, 0x23, 0x26, 0x3a, 0xfa, 0x2b, 0x50, 0xe3, 0xfe, 0x3c,
+	0x4b, 0xef, 0x9b, 0xe8, 0xe4, 0x79, 0xee, 0xee, 0x1d, 0x5f, 0xbd, 0x6d, 0xdc, 0xf9, 0xeb, 0x6d,
+	0xe3, 0xce, 0x8f, 0xd7, 0x0d, 0xe5, 0xea, 0xba, 0xa1, 0xfc, 0x79, 0xdd, 0x50, 0xfe, 0xb9, 0x6e,
+	0x28, 0xdf, 0x6c, 0xcd, 0xf7, 0x1f, 0xde, 0x67, 0xfc, 0xf7, 0x4c, 0x15, 0xe6, 0xb7, 0xfe, 0x0d,
+	0x00, 0x00, 0xff, 0xff, 0xf6, 0xcc, 0xc3, 0x0f, 0x1f, 0x0e, 0x00, 0x00,
 }
diff --git a/linux/shim/v1/shim.proto b/linux/shim/v1/shim.proto
index bb52e6182..1a877672a 100644
--- a/linux/shim/v1/shim.proto
+++ b/linux/shim/v1/shim.proto
@@ -28,7 +28,7 @@ service Shim {
 
 	rpc DeleteProcess(DeleteProcessRequest) returns (DeleteResponse);
 
-	rpc ListProcesses(ListProcessesRequest) returns (ListProcessesResponse);
+	rpc ListPids(ListPidsRequest) returns (ListPidsResponse);
 
 	rpc Pause(google.protobuf.Empty) returns (google.protobuf.Empty);
 
@@ -120,12 +120,12 @@ message CloseIORequest {
 	bool stdin = 2;
 }
 
-message ListProcessesRequest {
+message ListPidsRequest {
 	string id = 1;
 }
 
-message ListProcessesResponse{
-	repeated containerd.v1.types.Process processes = 1;
+message ListPidsResponse{
+	repeated uint32 pids = 1;
 }
 
 message CheckpointTaskRequest {
diff --git a/linux/task.go b/linux/task.go
index 74c7046df..14844aa6f 100644
--- a/linux/task.go
+++ b/linux/task.go
@@ -127,21 +127,14 @@ func (t *Task) Exec(ctx context.Context, opts runtime.ExecOpts) (runtime.Process
 	}, nil
 }
 
-func (t *Task) Processes(ctx context.Context) ([]uint32, error) {
-	resp, err := t.shim.ListProcesses(ctx, &shim.ListProcessesRequest{
+func (t *Task) Pids(ctx context.Context) ([]uint32, error) {
+	resp, err := t.shim.ListPids(ctx, &shim.ListPidsRequest{
 		ID: t.containerID,
 	})
 	if err != nil {
 		return nil, errors.New(grpc.ErrorDesc(err))
 	}
-
-	pids := make([]uint32, 0, len(resp.Processes))
-
-	for _, ps := range resp.Processes {
-		pids = append(pids, ps.Pid)
-	}
-
-	return pids, nil
+	return resp.Pids, nil
 }
 
 func (t *Task) ResizePty(ctx context.Context, pid uint32, size runtime.ConsoleSize) error {
diff --git a/runtime/task.go b/runtime/task.go
index 19682a948..41dc2257a 100644
--- a/runtime/task.go
+++ b/runtime/task.go
@@ -25,8 +25,8 @@ type Task interface {
 	Kill(context.Context, uint32, uint32, bool) error
 	// Exec adds a process into the container
 	Exec(context.Context, ExecOpts) (Process, error)
-	// Processes returns all pids for the container
-	Processes(context.Context) ([]uint32, error)
+	// Pids returns all pids for the task
+	Pids(context.Context) ([]uint32, error)
 	// Pty resizes the processes pty/console
 	ResizePty(context.Context, uint32, ConsoleSize) error
 	// CloseStdin closes the processes stdin
diff --git a/services/tasks/service.go b/services/tasks/service.go
index ad427d373..b9c6c445c 100644
--- a/services/tasks/service.go
+++ b/services/tasks/service.go
@@ -340,25 +340,17 @@ func (s *Service) Kill(ctx context.Context, r *api.KillRequest) (*google_protobu
 	return empty, nil
 }
 
-func (s *Service) ListProcesses(ctx context.Context, r *api.ListProcessesRequest) (*api.ListProcessesResponse, error) {
+func (s *Service) ListPids(ctx context.Context, r *api.ListPidsRequest) (*api.ListPidsResponse, error) {
 	t, err := s.getTask(ctx, r.ContainerID)
 	if err != nil {
 		return nil, err
 	}
-
-	pids, err := t.Processes(ctx)
+	pids, err := t.Pids(ctx)
 	if err != nil {
 		return nil, err
 	}
-
-	ps := []*task.Process{}
-	for _, pid := range pids {
-		ps = append(ps, &task.Process{
-			Pid: pid,
-		})
-	}
-	return &api.ListProcessesResponse{
-		Processes: ps,
+	return &api.ListPidsResponse{
+		Pids: pids,
 	}, nil
 }
 
diff --git a/task.go b/task.go
index 8ba9533b6..d08f4944e 100644
--- a/task.go
+++ b/task.go
@@ -213,17 +213,13 @@ func (t *task) Exec(ctx context.Context, spec *specs.Process, ioCreate IOCreatio
 }
 
 func (t *task) Processes(ctx context.Context) ([]uint32, error) {
-	response, err := t.client.TaskService().ListProcesses(ctx, &tasks.ListProcessesRequest{
+	response, err := t.client.TaskService().ListPids(ctx, &tasks.ListPidsRequest{
 		ContainerID: t.containerID,
 	})
 	if err != nil {
 		return nil, err
 	}
-	var out []uint32
-	for _, p := range response.Processes {
-		out = append(out, p.Pid)
-	}
-	return out, nil
+	return response.Pids, nil
 }
 
 func (t *task) CloseIO(ctx context.Context, opts ...IOCloserOpts) error {
diff --git a/windows/container.go b/windows/container.go
index 18c649311..bd26fe343 100644
--- a/windows/container.go
+++ b/windows/container.go
@@ -175,17 +175,15 @@ func (c *container) Pid() uint32 {
 	return c.ctr.Pid()
 }
 
-func (c *container) Processes(ctx context.Context) ([]uint32, error) {
+func (c *container) Pids(ctx context.Context) ([]uint32, error) {
 	pl, err := c.ctr.ProcessList()
 	if err != nil {
 		return nil, err
 	}
-
 	pids := make([]uint32, 0, len(pl))
 	for _, p := range pl {
 		pids = append(pids, p.ProcessId)
 	}
-
 	return pids, nil
 }