mirror of
https://github.com/k3s-io/k3s.git
synced 2024-06-07 19:41:36 +00:00
410 lines
10 KiB
Go
410 lines
10 KiB
Go
// Copyright 2015 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// The machine package contains functions that extract machine-level specs.
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package machine
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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// s390/s390x changes
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"runtime"
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info "github.com/google/cadvisor/info/v1"
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"github.com/google/cadvisor/utils"
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"github.com/google/cadvisor/utils/sysfs"
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"github.com/google/cadvisor/utils/sysinfo"
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"k8s.io/klog"
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"golang.org/x/sys/unix"
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)
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var (
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cpuRegExp = regexp.MustCompile(`^processor\s*:\s*([0-9]+)$`)
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coreRegExp = regexp.MustCompile(`^core id\s*:\s*([0-9]+)$`)
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nodeRegExp = regexp.MustCompile(`^physical id\s*:\s*([0-9]+)$`)
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nodeBusRegExp = regexp.MustCompile(`^node([0-9]+)$`)
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// Power systems have a different format so cater for both
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cpuClockSpeedMHz = regexp.MustCompile(`(?:cpu MHz|clock)\s*:\s*([0-9]+\.[0-9]+)(?:MHz)?`)
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memoryCapacityRegexp = regexp.MustCompile(`MemTotal:\s*([0-9]+) kB`)
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swapCapacityRegexp = regexp.MustCompile(`SwapTotal:\s*([0-9]+) kB`)
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)
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const maxFreqFile = "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq"
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const cpuBusPath = "/sys/bus/cpu/devices/"
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// GetClockSpeed returns the CPU clock speed, given a []byte formatted as the /proc/cpuinfo file.
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func GetClockSpeed(procInfo []byte) (uint64, error) {
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// s390/s390x, aarch64 and arm32 changes
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if isSystemZ() || isAArch64() || isArm32() {
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return 0, nil
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}
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// First look through sys to find a max supported cpu frequency.
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if utils.FileExists(maxFreqFile) {
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val, err := ioutil.ReadFile(maxFreqFile)
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if err != nil {
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return 0, err
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}
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var maxFreq uint64
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n, err := fmt.Sscanf(string(val), "%d", &maxFreq)
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if err != nil || n != 1 {
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return 0, fmt.Errorf("could not parse frequency %q", val)
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}
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return maxFreq, nil
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}
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// Fall back to /proc/cpuinfo
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matches := cpuClockSpeedMHz.FindSubmatch(procInfo)
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if len(matches) != 2 {
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return 0, fmt.Errorf("could not detect clock speed from output: %q", string(procInfo))
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}
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speed, err := strconv.ParseFloat(string(matches[1]), 64)
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if err != nil {
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return 0, err
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}
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// Convert to kHz
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return uint64(speed * 1000), nil
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}
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// GetMachineMemoryCapacity returns the machine's total memory from /proc/meminfo.
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// Returns the total memory capacity as an uint64 (number of bytes).
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func GetMachineMemoryCapacity() (uint64, error) {
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out, err := ioutil.ReadFile("/proc/meminfo")
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if err != nil {
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return 0, err
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}
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memoryCapacity, err := parseCapacity(out, memoryCapacityRegexp)
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if err != nil {
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return 0, err
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}
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return memoryCapacity, err
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}
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// GetMachineSwapCapacity returns the machine's total swap from /proc/meminfo.
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// Returns the total swap capacity as an uint64 (number of bytes).
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func GetMachineSwapCapacity() (uint64, error) {
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out, err := ioutil.ReadFile("/proc/meminfo")
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if err != nil {
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return 0, err
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}
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swapCapacity, err := parseCapacity(out, swapCapacityRegexp)
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if err != nil {
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return 0, err
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}
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return swapCapacity, err
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}
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// parseCapacity matches a Regexp in a []byte, returning the resulting value in bytes.
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// Assumes that the value matched by the Regexp is in KB.
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func parseCapacity(b []byte, r *regexp.Regexp) (uint64, error) {
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matches := r.FindSubmatch(b)
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if len(matches) != 2 {
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return 0, fmt.Errorf("failed to match regexp in output: %q", string(b))
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}
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m, err := strconv.ParseUint(string(matches[1]), 10, 64)
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if err != nil {
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return 0, err
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}
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// Convert to bytes.
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return m * 1024, err
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}
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/* Look for sysfs cpu path containing core_id */
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/* Such as: sys/bus/cpu/devices/cpu0/topology/core_id */
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func getCoreIdFromCpuBus(cpuBusPath string, threadId int) (int, error) {
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path := filepath.Join(cpuBusPath, fmt.Sprintf("cpu%d/topology", threadId))
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file := filepath.Join(path, "core_id")
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num, err := ioutil.ReadFile(file)
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if err != nil {
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return threadId, err
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}
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coreId, err := strconv.ParseInt(string(bytes.TrimSpace(num)), 10, 32)
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if err != nil {
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return threadId, err
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}
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if coreId < 0 {
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// report threadId if found coreId < 0
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coreId = int64(threadId)
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}
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return int(coreId), nil
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}
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/* Look for sysfs cpu path containing node id */
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/* Such as: /sys/bus/cpu/devices/cpu0/node%d */
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func getNodeIdFromCpuBus(cpuBusPath string, threadId int) (int, error) {
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path := filepath.Join(cpuBusPath, fmt.Sprintf("cpu%d", threadId))
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files, err := ioutil.ReadDir(path)
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if err != nil {
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return 0, err
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}
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nodeId := 0
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for _, file := range files {
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filename := file.Name()
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isNode, error := regexp.MatchString("^node([0-9]+)$", filename)
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if error != nil {
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continue
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}
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if !isNode {
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continue
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}
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ok, val, _ := extractValue(filename, nodeBusRegExp)
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if err != nil {
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continue
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}
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if ok {
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if val < 0 {
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continue
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}
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nodeId = val
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}
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}
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return nodeId, nil
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}
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func GetTopology(sysFs sysfs.SysFs, cpuinfo string) ([]info.Node, int, error) {
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nodes := []info.Node{}
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// s390/s390x changes
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if true == isSystemZ() {
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return nodes, getNumCores(), nil
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}
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numCores := 0
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lastThread := -1
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lastCore := -1
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lastNode := -1
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for _, line := range strings.Split(cpuinfo, "\n") {
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if line == "" {
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continue
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}
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ok, val, err := extractValue(line, cpuRegExp)
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if err != nil {
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return nil, -1, fmt.Errorf("could not parse cpu info from %q: %v", line, err)
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}
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if ok {
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thread := val
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numCores++
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if lastThread != -1 {
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// New cpu section. Save last one.
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nodeIdx, err := addNode(&nodes, lastNode)
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if err != nil {
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return nil, -1, fmt.Errorf("failed to add node %d: %v", lastNode, err)
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}
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nodes[nodeIdx].AddThread(lastThread, lastCore)
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lastCore = -1
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lastNode = -1
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}
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lastThread = thread
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/* On Arm platform, no 'core id' and 'physical id' in '/proc/cpuinfo'. */
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/* So we search sysfs cpu path directly. */
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/* This method can also be used on other platforms, such as x86, ppc64le... */
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/* /sys/bus/cpu/devices/cpu%d contains the information of 'core_id' & 'node_id'. */
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/* Such as: /sys/bus/cpu/devices/cpu0/topology/core_id */
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/* Such as: /sys/bus/cpu/devices/cpu0/node0 */
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if isAArch64() {
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val, err = getCoreIdFromCpuBus(cpuBusPath, lastThread)
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if err != nil {
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// Report thread id if no NUMA
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val = lastThread
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}
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lastCore = val
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val, err = getNodeIdFromCpuBus(cpuBusPath, lastThread)
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if err != nil {
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// Report node 0 if no NUMA
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val = 0
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}
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lastNode = val
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}
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continue
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}
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if isAArch64() {
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/* On Arm platform, no 'core id' and 'physical id' in '/proc/cpuinfo'. */
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continue
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}
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ok, val, err = extractValue(line, coreRegExp)
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if err != nil {
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return nil, -1, fmt.Errorf("could not parse core info from %q: %v", line, err)
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}
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if ok {
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lastCore = val
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continue
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}
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ok, val, err = extractValue(line, nodeRegExp)
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if err != nil {
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return nil, -1, fmt.Errorf("could not parse node info from %q: %v", line, err)
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}
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if ok {
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lastNode = val
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continue
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}
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}
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nodeIdx, err := addNode(&nodes, lastNode)
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if err != nil {
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return nil, -1, fmt.Errorf("failed to add node %d: %v", lastNode, err)
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}
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nodes[nodeIdx].AddThread(lastThread, lastCore)
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if numCores < 1 {
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return nil, numCores, fmt.Errorf("could not detect any cores")
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}
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for idx, node := range nodes {
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caches, err := sysinfo.GetCacheInfo(sysFs, node.Cores[0].Threads[0])
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if err != nil {
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klog.Errorf("failed to get cache information for node %d: %v", node.Id, err)
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continue
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}
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numThreadsPerCore := len(node.Cores[0].Threads)
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numThreadsPerNode := len(node.Cores) * numThreadsPerCore
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for _, cache := range caches {
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c := info.Cache{
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Size: cache.Size,
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Level: cache.Level,
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Type: cache.Type,
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}
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if cache.Cpus == numThreadsPerNode && cache.Level > 2 {
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// Add a node-level cache.
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nodes[idx].AddNodeCache(c)
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} else if cache.Cpus == numThreadsPerCore {
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// Add to each core.
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nodes[idx].AddPerCoreCache(c)
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}
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// Ignore unknown caches.
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}
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}
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return nodes, numCores, nil
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}
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func extractValue(s string, r *regexp.Regexp) (bool, int, error) {
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matches := r.FindSubmatch([]byte(s))
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if len(matches) == 2 {
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val, err := strconv.ParseInt(string(matches[1]), 10, 32)
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if err != nil {
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return false, -1, err
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}
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return true, int(val), nil
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}
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return false, -1, nil
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}
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func findNode(nodes []info.Node, id int) (bool, int) {
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for i, n := range nodes {
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if n.Id == id {
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return true, i
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}
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}
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return false, -1
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}
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func addNode(nodes *[]info.Node, id int) (int, error) {
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var idx int
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if id == -1 {
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// Some VMs don't fill topology data. Export single package.
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id = 0
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}
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ok, idx := findNode(*nodes, id)
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if !ok {
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// New node
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node := info.Node{Id: id}
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// Add per-node memory information.
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meminfo := fmt.Sprintf("/sys/devices/system/node/node%d/meminfo", id)
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out, err := ioutil.ReadFile(meminfo)
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// Ignore if per-node info is not available.
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if err == nil {
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m, err := parseCapacity(out, memoryCapacityRegexp)
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if err != nil {
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return -1, err
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}
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node.Memory = uint64(m)
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}
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*nodes = append(*nodes, node)
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idx = len(*nodes) - 1
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}
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return idx, nil
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}
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// s390/s390x changes
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func getMachineArch() (string, error) {
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uname := unix.Utsname{}
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err := unix.Uname(&uname)
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if err != nil {
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return "", err
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}
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return string(uname.Machine[:]), nil
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}
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// arm32 chanes
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func isArm32() bool {
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arch, err := getMachineArch()
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if err == nil {
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return strings.Contains(arch, "arm")
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}
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return false
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}
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// aarch64 changes
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func isAArch64() bool {
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arch, err := getMachineArch()
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if err == nil {
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return strings.Contains(arch, "aarch64")
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}
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return false
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}
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// s390/s390x changes
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func isSystemZ() bool {
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arch, err := getMachineArch()
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if err == nil {
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return strings.Contains(arch, "390")
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}
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return false
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}
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// s390/s390x changes
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func getNumCores() int {
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maxProcs := runtime.GOMAXPROCS(0)
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numCPU := runtime.NumCPU()
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if maxProcs < numCPU {
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return maxProcs
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}
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return numCPU
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}
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