437 lines
10 KiB
Go
437 lines
10 KiB
Go
/*
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Copyright The containerd Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package v2
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import (
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"bufio"
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"fmt"
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"io"
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"io/ioutil"
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"math"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"github.com/containerd/cgroups/v2/stats"
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"github.com/godbus/dbus/v5"
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"github.com/opencontainers/runtime-spec/specs-go"
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"github.com/sirupsen/logrus"
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)
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const (
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cgroupProcs = "cgroup.procs"
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defaultDirPerm = 0755
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)
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// defaultFilePerm is a var so that the test framework can change the filemode
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// of all files created when the tests are running. The difference between the
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// tests and real world use is that files like "cgroup.procs" will exist when writing
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// to a read cgroup filesystem and do not exist prior when running in the tests.
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// this is set to a non 0 value in the test code
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var defaultFilePerm = os.FileMode(0)
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// remove will remove a cgroup path handling EAGAIN and EBUSY errors and
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// retrying the remove after a exp timeout
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func remove(path string) error {
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var err error
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delay := 10 * time.Millisecond
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for i := 0; i < 5; i++ {
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if i != 0 {
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time.Sleep(delay)
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delay *= 2
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}
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if err = os.RemoveAll(path); err == nil {
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return nil
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}
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}
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return fmt.Errorf("cgroups: unable to remove path %q: %w", path, err)
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}
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// parseCgroupProcsFile parses /sys/fs/cgroup/$GROUPPATH/cgroup.procs
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func parseCgroupProcsFile(path string) ([]uint64, error) {
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f, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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var (
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out []uint64
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s = bufio.NewScanner(f)
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)
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for s.Scan() {
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if t := s.Text(); t != "" {
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pid, err := strconv.ParseUint(t, 10, 0)
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if err != nil {
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return nil, err
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}
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out = append(out, pid)
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}
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}
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if err := s.Err(); err != nil {
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return nil, err
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}
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return out, nil
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}
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func parseKV(raw string) (string, interface{}, error) {
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parts := strings.Fields(raw)
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switch len(parts) {
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case 2:
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v, err := parseUint(parts[1], 10, 64)
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if err != nil {
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// if we cannot parse as a uint, parse as a string
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return parts[0], parts[1], nil
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}
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return parts[0], v, nil
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default:
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return "", 0, ErrInvalidFormat
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}
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}
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func parseUint(s string, base, bitSize int) (uint64, error) {
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v, err := strconv.ParseUint(s, base, bitSize)
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if err != nil {
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intValue, intErr := strconv.ParseInt(s, base, bitSize)
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// 1. Handle negative values greater than MinInt64 (and)
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// 2. Handle negative values lesser than MinInt64
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if intErr == nil && intValue < 0 {
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return 0, nil
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} else if intErr != nil &&
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intErr.(*strconv.NumError).Err == strconv.ErrRange &&
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intValue < 0 {
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return 0, nil
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}
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return 0, err
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}
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return v, nil
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}
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// parseCgroupFile parses /proc/PID/cgroup file and return string
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func parseCgroupFile(path string) (string, error) {
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f, err := os.Open(path)
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if err != nil {
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return "", err
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}
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defer f.Close()
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return parseCgroupFromReader(f)
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}
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func parseCgroupFromReader(r io.Reader) (string, error) {
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var (
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s = bufio.NewScanner(r)
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)
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for s.Scan() {
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var (
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text = s.Text()
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parts = strings.SplitN(text, ":", 3)
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)
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if len(parts) < 3 {
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return "", fmt.Errorf("invalid cgroup entry: %q", text)
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}
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// text is like "0::/user.slice/user-1001.slice/session-1.scope"
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if parts[0] == "0" && parts[1] == "" {
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return parts[2], nil
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}
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}
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if err := s.Err(); err != nil {
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return "", err
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}
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return "", fmt.Errorf("cgroup path not found")
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}
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// ToResources converts the oci LinuxResources struct into a
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// v2 Resources type for use with this package.
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//
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// converting cgroups configuration from v1 to v2
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// ref: https://github.com/containers/crun/blob/master/crun.1.md#cgroup-v2
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func ToResources(spec *specs.LinuxResources) *Resources {
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var resources Resources
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if cpu := spec.CPU; cpu != nil {
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resources.CPU = &CPU{
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Cpus: cpu.Cpus,
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Mems: cpu.Mems,
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}
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if shares := cpu.Shares; shares != nil {
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convertedWeight := 1 + ((*shares-2)*9999)/262142
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resources.CPU.Weight = &convertedWeight
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}
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if period := cpu.Period; period != nil {
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resources.CPU.Max = NewCPUMax(cpu.Quota, period)
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}
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}
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if mem := spec.Memory; mem != nil {
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resources.Memory = &Memory{}
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if swap := mem.Swap; swap != nil {
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resources.Memory.Swap = swap
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}
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if l := mem.Limit; l != nil {
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resources.Memory.Max = l
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}
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if l := mem.Reservation; l != nil {
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resources.Memory.Low = l
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}
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}
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if hugetlbs := spec.HugepageLimits; hugetlbs != nil {
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hugeTlbUsage := HugeTlb{}
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for _, hugetlb := range hugetlbs {
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hugeTlbUsage = append(hugeTlbUsage, HugeTlbEntry{
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HugePageSize: hugetlb.Pagesize,
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Limit: hugetlb.Limit,
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})
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}
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resources.HugeTlb = &hugeTlbUsage
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}
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if pids := spec.Pids; pids != nil {
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resources.Pids = &Pids{
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Max: pids.Limit,
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}
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}
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if i := spec.BlockIO; i != nil {
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resources.IO = &IO{}
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if i.Weight != nil {
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resources.IO.BFQ.Weight = 1 + (*i.Weight-10)*9999/990
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}
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for t, devices := range map[IOType][]specs.LinuxThrottleDevice{
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ReadBPS: i.ThrottleReadBpsDevice,
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WriteBPS: i.ThrottleWriteBpsDevice,
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ReadIOPS: i.ThrottleReadIOPSDevice,
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WriteIOPS: i.ThrottleWriteIOPSDevice,
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} {
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for _, d := range devices {
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resources.IO.Max = append(resources.IO.Max, Entry{
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Type: t,
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Major: d.Major,
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Minor: d.Minor,
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Rate: d.Rate,
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})
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}
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}
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}
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if i := spec.Rdma; i != nil {
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resources.RDMA = &RDMA{}
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for device, value := range spec.Rdma {
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if device != "" && (value.HcaHandles != nil && value.HcaObjects != nil) {
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resources.RDMA.Limit = append(resources.RDMA.Limit, RDMAEntry{
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Device: device,
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HcaHandles: *value.HcaHandles,
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HcaObjects: *value.HcaObjects,
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})
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}
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}
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}
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return &resources
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}
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// Gets uint64 parsed content of single value cgroup stat file
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func getStatFileContentUint64(filePath string) uint64 {
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contents, err := ioutil.ReadFile(filePath)
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if err != nil {
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return 0
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}
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trimmed := strings.TrimSpace(string(contents))
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if trimmed == "max" {
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return math.MaxUint64
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}
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res, err := parseUint(trimmed, 10, 64)
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if err != nil {
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logrus.Errorf("unable to parse %q as a uint from Cgroup file %q", string(contents), filePath)
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return res
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}
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return res
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}
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func readIoStats(path string) []*stats.IOEntry {
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// more details on the io.stat file format: https://www.kernel.org/doc/Documentation/cgroup-v2.txt
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var usage []*stats.IOEntry
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fpath := filepath.Join(path, "io.stat")
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currentData, err := ioutil.ReadFile(fpath)
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if err != nil {
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return usage
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}
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entries := strings.Split(string(currentData), "\n")
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for _, entry := range entries {
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parts := strings.Split(entry, " ")
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if len(parts) < 2 {
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continue
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}
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majmin := strings.Split(parts[0], ":")
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if len(majmin) != 2 {
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continue
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}
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major, err := strconv.ParseUint(majmin[0], 10, 0)
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if err != nil {
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return usage
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}
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minor, err := strconv.ParseUint(majmin[1], 10, 0)
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if err != nil {
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return usage
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}
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parts = parts[1:]
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ioEntry := stats.IOEntry{
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Major: major,
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Minor: minor,
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}
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for _, s := range parts {
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keyPairValue := strings.Split(s, "=")
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if len(keyPairValue) != 2 {
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continue
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}
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v, err := strconv.ParseUint(keyPairValue[1], 10, 0)
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if err != nil {
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continue
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}
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switch keyPairValue[0] {
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case "rbytes":
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ioEntry.Rbytes = v
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case "wbytes":
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ioEntry.Wbytes = v
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case "rios":
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ioEntry.Rios = v
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case "wios":
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ioEntry.Wios = v
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}
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}
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usage = append(usage, &ioEntry)
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}
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return usage
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}
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func rdmaStats(filepath string) []*stats.RdmaEntry {
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currentData, err := ioutil.ReadFile(filepath)
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if err != nil {
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return []*stats.RdmaEntry{}
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}
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return toRdmaEntry(strings.Split(string(currentData), "\n"))
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}
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func parseRdmaKV(raw string, entry *stats.RdmaEntry) {
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var value uint64
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var err error
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parts := strings.Split(raw, "=")
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switch len(parts) {
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case 2:
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if parts[1] == "max" {
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value = math.MaxUint32
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} else {
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value, err = parseUint(parts[1], 10, 32)
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if err != nil {
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return
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}
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}
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if parts[0] == "hca_handle" {
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entry.HcaHandles = uint32(value)
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} else if parts[0] == "hca_object" {
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entry.HcaObjects = uint32(value)
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}
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}
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}
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func toRdmaEntry(strEntries []string) []*stats.RdmaEntry {
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var rdmaEntries []*stats.RdmaEntry
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for i := range strEntries {
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parts := strings.Fields(strEntries[i])
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switch len(parts) {
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case 3:
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entry := new(stats.RdmaEntry)
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entry.Device = parts[0]
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parseRdmaKV(parts[1], entry)
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parseRdmaKV(parts[2], entry)
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rdmaEntries = append(rdmaEntries, entry)
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default:
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continue
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}
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}
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return rdmaEntries
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}
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// isUnitExists returns true if the error is that a systemd unit already exists.
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func isUnitExists(err error) bool {
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if err != nil {
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if dbusError, ok := err.(dbus.Error); ok {
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return strings.Contains(dbusError.Name, "org.freedesktop.systemd1.UnitExists")
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}
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}
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return false
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}
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func systemdUnitFromPath(path string) string {
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_, unit := filepath.Split(path)
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return unit
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}
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func readHugeTlbStats(path string) []*stats.HugeTlbStat {
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var usage = []*stats.HugeTlbStat{}
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var keyUsage = make(map[string]*stats.HugeTlbStat)
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f, err := os.Open(path)
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if err != nil {
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return usage
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}
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files, err := f.Readdir(-1)
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f.Close()
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if err != nil {
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return usage
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}
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for _, file := range files {
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if strings.Contains(file.Name(), "hugetlb") &&
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(strings.HasSuffix(file.Name(), "max") || strings.HasSuffix(file.Name(), "current")) {
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var hugeTlb *stats.HugeTlbStat
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var ok bool
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fileName := strings.Split(file.Name(), ".")
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pageSize := fileName[1]
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if hugeTlb, ok = keyUsage[pageSize]; !ok {
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hugeTlb = &stats.HugeTlbStat{}
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}
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hugeTlb.Pagesize = pageSize
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out, err := ioutil.ReadFile(filepath.Join(path, file.Name()))
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if err != nil {
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continue
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}
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var value uint64
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stringVal := strings.TrimSpace(string(out))
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if stringVal == "max" {
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value = math.MaxUint64
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} else {
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value, err = strconv.ParseUint(stringVal, 10, 64)
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}
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if err != nil {
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continue
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}
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switch fileName[2] {
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case "max":
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hugeTlb.Max = value
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case "current":
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hugeTlb.Current = value
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}
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keyUsage[pageSize] = hugeTlb
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}
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}
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for _, entry := range keyUsage {
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usage = append(usage, entry)
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}
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return usage
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}
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