[process] Add benchmarks for New(), Name() Ppid()

run only them with: go test -bench=. -run=xxx github.com/shirou/gopsutil/process

process/process_test.go

@@ -662,3 +662,23 @@ func Test_AllProcesses_cmdLine(t *testing.T) {
 		}
 	}
 }
+func BenchmarkNewProcess(b *testing.B) {
+	checkPid := os.Getpid()
+	for i := 0; i < b.N; i++ {
+		NewProcess(int32(checkPid))
+    }
+}
+
+func BenchmarkProcessName(b *testing.B) {
+	p := testGetProcess()
+	for i := 0; i < b.N; i++ {
+		p.Name()
+    }
+}
+
+func BenchmarkProcessPpid(b *testing.B) {
+	p := testGetProcess()
+	for i := 0; i < b.N; i++ {
+		p.Ppid()
+    }
+}