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// Copyright 2016 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Based on gopsutil/cpu/cpu_darwin_cgo.go @ ae251eb which is licensed under
// BSD. See https://github.com/shirou/gopsutil/blob/master/LICENSE for details.
// +build !nocpu
package collector
import (
"bytes"
"encoding/binary"
"fmt"
"strconv"
"unsafe"
"github.com/go-kit/kit/log"
"github.com/prometheus/client_golang/prometheus"
)
/*
#cgo LDFLAGS:
#include <stdlib.h>
#include <limits.h>
#include <sys/sysctl.h>
#include <sys/mount.h>
#include <mach/mach_init.h>
#include <mach/mach_host.h>
#include <mach/host_info.h>
#if TARGET_OS_MAC
#include <libproc.h>
#endif
#include <mach/processor_info.h>
#include <mach/vm_map.h>
*/
import "C"
// ClocksPerSec default value. from time.h
const ClocksPerSec = float64(C.CLK_TCK)
type statCollector struct {
cpu *prometheus.Desc
logger log.Logger
}
func init() {
registerCollector("cpu", defaultEnabled, NewCPUCollector)
}
// NewCPUCollector returns a new Collector exposing CPU stats.
func NewCPUCollector(logger log.Logger) (Collector, error) {
return &statCollector{
cpu: nodeCPUSecondsDesc,
logger: logger,
}, nil
}
func (c *statCollector) Update(ch chan<- prometheus.Metric) error {
var (
count C.mach_msg_type_number_t
cpuload *C.processor_cpu_load_info_data_t
ncpu C.natural_t
)
status := C.host_processor_info(C.host_t(C.mach_host_self()),
C.PROCESSOR_CPU_LOAD_INFO,
&ncpu,
(*C.processor_info_array_t)(unsafe.Pointer(&cpuload)),
&count)
if status != C.KERN_SUCCESS {
return fmt.Errorf("host_processor_info error=%d", status)
}
// jump through some cgo casting hoops and ensure we properly free
// the memory that cpuload points to
target := C.vm_map_t(C.mach_task_self_)
address := C.vm_address_t(uintptr(unsafe.Pointer(cpuload)))
defer C.vm_deallocate(target, address, C.vm_size_t(ncpu))
// the body of struct processor_cpu_load_info
// aka processor_cpu_load_info_data_t
var cpuTicks [C.CPU_STATE_MAX]uint32
// copy the cpuload array to a []byte buffer
// where we can binary.Read the data
size := int(ncpu) * binary.Size(cpuTicks)
buf := (*[1 << 30]byte)(unsafe.Pointer(cpuload))[:size:size]
bbuf := bytes.NewBuffer(buf)
for i := 0; i < int(ncpu); i++ {
err := binary.Read(bbuf, binary.LittleEndian, &cpuTicks)
if err != nil {
return err
}
for k, v := range map[string]int{
"user": C.CPU_STATE_USER,
"system": C.CPU_STATE_SYSTEM,
"nice": C.CPU_STATE_NICE,
"idle": C.CPU_STATE_IDLE,
} {
ch <- prometheus.MustNewConstMetric(c.cpu, prometheus.CounterValue, float64(cpuTicks[v])/ClocksPerSec, strconv.Itoa(i), k)
}
}
return nil
}
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