1// Copyright 2016 The Prometheus Authors 2// Licensed under the Apache License, Version 2.0 (the "License"); 3// you may not use this file except in compliance with the License. 4// You may obtain a copy of the License at 5// 6// http://www.apache.org/licenses/LICENSE-2.0 7// 8// Unless required by applicable law or agreed to in writing, software 9// distributed under the License is distributed on an "AS IS" BASIS, 10// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 11// See the License for the specific language governing permissions and 12// limitations under the License. 13 14// Based on gopsutil/cpu/cpu_darwin_cgo.go @ ae251eb which is licensed under 15// BSD. See https://github.com/shirou/gopsutil/blob/master/LICENSE for details. 16 17// +build !nocpu 18 19package collector 20 21import ( 22 "bytes" 23 "encoding/binary" 24 "fmt" 25 "strconv" 26 "unsafe" 27 28 "github.com/go-kit/kit/log" 29 "github.com/prometheus/client_golang/prometheus" 30) 31 32/* 33#cgo LDFLAGS: 34#include <stdlib.h> 35#include <limits.h> 36#include <sys/sysctl.h> 37#include <sys/mount.h> 38#include <mach/mach_init.h> 39#include <mach/mach_host.h> 40#include <mach/host_info.h> 41#if TARGET_OS_MAC 42#include <libproc.h> 43#endif 44#include <mach/processor_info.h> 45#include <mach/vm_map.h> 46*/ 47import "C" 48 49// ClocksPerSec default value. from time.h 50const ClocksPerSec = float64(C.CLK_TCK) 51 52type statCollector struct { 53 cpu *prometheus.Desc 54 logger log.Logger 55} 56 57func init() { 58 registerCollector("cpu", defaultEnabled, NewCPUCollector) 59} 60 61// NewCPUCollector returns a new Collector exposing CPU stats. 62func NewCPUCollector(logger log.Logger) (Collector, error) { 63 return &statCollector{ 64 cpu: nodeCPUSecondsDesc, 65 logger: logger, 66 }, nil 67} 68 69func (c *statCollector) Update(ch chan<- prometheus.Metric) error { 70 var ( 71 count C.mach_msg_type_number_t 72 cpuload *C.processor_cpu_load_info_data_t 73 ncpu C.natural_t 74 ) 75 76 status := C.host_processor_info(C.host_t(C.mach_host_self()), 77 C.PROCESSOR_CPU_LOAD_INFO, 78 &ncpu, 79 (*C.processor_info_array_t)(unsafe.Pointer(&cpuload)), 80 &count) 81 82 if status != C.KERN_SUCCESS { 83 return fmt.Errorf("host_processor_info error=%d", status) 84 } 85 86 // jump through some cgo casting hoops and ensure we properly free 87 // the memory that cpuload points to 88 target := C.vm_map_t(C.mach_task_self_) 89 address := C.vm_address_t(uintptr(unsafe.Pointer(cpuload))) 90 defer C.vm_deallocate(target, address, C.vm_size_t(ncpu)) 91 92 // the body of struct processor_cpu_load_info 93 // aka processor_cpu_load_info_data_t 94 var cpuTicks [C.CPU_STATE_MAX]uint32 95 96 // copy the cpuload array to a []byte buffer 97 // where we can binary.Read the data 98 size := int(ncpu) * binary.Size(cpuTicks) 99 buf := (*[1 << 30]byte)(unsafe.Pointer(cpuload))[:size:size] 100 101 bbuf := bytes.NewBuffer(buf) 102 103 for i := 0; i < int(ncpu); i++ { 104 err := binary.Read(bbuf, binary.LittleEndian, &cpuTicks) 105 if err != nil { 106 return err 107 } 108 for k, v := range map[string]int{ 109 "user": C.CPU_STATE_USER, 110 "system": C.CPU_STATE_SYSTEM, 111 "nice": C.CPU_STATE_NICE, 112 "idle": C.CPU_STATE_IDLE, 113 } { 114 ch <- prometheus.MustNewConstMetric(c.cpu, prometheus.CounterValue, float64(cpuTicks[v])/ClocksPerSec, strconv.Itoa(i), k) 115 } 116 } 117 return nil 118} 119