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cpu.go (2829B)

      1 /*
      2    Copyright The containerd Authors.
      3 
      4    Licensed under the Apache License, Version 2.0 (the "License");
      5    you may not use this file except in compliance with the License.
      6    You may obtain a copy of the License at
      7 
      8        http://www.apache.org/licenses/LICENSE-2.0
      9 
     10    Unless required by applicable law or agreed to in writing, software
     11    distributed under the License is distributed on an "AS IS" BASIS,
     12    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13    See the License for the specific language governing permissions and
     14    limitations under the License.
     15 */
     16 
     17 package cgroup1
     18 
     19 import (
     20 	"bufio"
     21 	"os"
     22 	"path/filepath"
     23 	"strconv"
     24 
     25 	v1 "github.com/containerd/cgroups/v3/cgroup1/stats"
     26 	specs "github.com/opencontainers/runtime-spec/specs-go"
     27 )
     28 
     29 func NewCpu(root string) *cpuController {
     30 	return &cpuController{
     31 		root: filepath.Join(root, string(Cpu)),
     32 	}
     33 }
     34 
     35 type cpuController struct {
     36 	root string
     37 }
     38 
     39 func (c *cpuController) Name() Name {
     40 	return Cpu
     41 }
     42 
     43 func (c *cpuController) Path(path string) string {
     44 	return filepath.Join(c.root, path)
     45 }
     46 
     47 func (c *cpuController) Create(path string, resources *specs.LinuxResources) error {
     48 	if err := os.MkdirAll(c.Path(path), defaultDirPerm); err != nil {
     49 		return err
     50 	}
     51 	if cpu := resources.CPU; cpu != nil {
     52 		for _, t := range []struct {
     53 			name   string
     54 			ivalue *int64
     55 			uvalue *uint64
     56 		}{
     57 			{
     58 				name:   "rt_period_us",
     59 				uvalue: cpu.RealtimePeriod,
     60 			},
     61 			{
     62 				name:   "rt_runtime_us",
     63 				ivalue: cpu.RealtimeRuntime,
     64 			},
     65 			{
     66 				name:   "shares",
     67 				uvalue: cpu.Shares,
     68 			},
     69 			{
     70 				name:   "cfs_period_us",
     71 				uvalue: cpu.Period,
     72 			},
     73 			{
     74 				name:   "cfs_quota_us",
     75 				ivalue: cpu.Quota,
     76 			},
     77 		} {
     78 			var value []byte
     79 			if t.uvalue != nil {
     80 				value = []byte(strconv.FormatUint(*t.uvalue, 10))
     81 			} else if t.ivalue != nil {
     82 				value = []byte(strconv.FormatInt(*t.ivalue, 10))
     83 			}
     84 			if value != nil {
     85 				if err := os.WriteFile(
     86 					filepath.Join(c.Path(path), "cpu."+t.name),
     87 					value,
     88 					defaultFilePerm,
     89 				); err != nil {
     90 					return err
     91 				}
     92 			}
     93 		}
     94 	}
     95 	return nil
     96 }
     97 
     98 func (c *cpuController) Update(path string, resources *specs.LinuxResources) error {
     99 	return c.Create(path, resources)
    100 }
    101 
    102 func (c *cpuController) Stat(path string, stats *v1.Metrics) error {
    103 	f, err := os.Open(filepath.Join(c.Path(path), "cpu.stat"))
    104 	if err != nil {
    105 		return err
    106 	}
    107 	defer f.Close()
    108 	// get or create the cpu field because cpuacct can also set values on this struct
    109 	sc := bufio.NewScanner(f)
    110 	for sc.Scan() {
    111 		key, v, err := parseKV(sc.Text())
    112 		if err != nil {
    113 			return err
    114 		}
    115 		switch key {
    116 		case "nr_periods":
    117 			stats.CPU.Throttling.Periods = v
    118 		case "nr_throttled":
    119 			stats.CPU.Throttling.ThrottledPeriods = v
    120 		case "throttled_time":
    121 			stats.CPU.Throttling.ThrottledTime = v
    122 		}
    123 	}
    124 	return sc.Err()
    125 }