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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| // Copyright (c) 2022 Gitpod GmbH. All rights reserved. | ||
| // Licensed under the GNU Affero General Public License (AGPL). | ||
| // See License-AGPL.txt in the project root for license information. | ||
|
|
||
| package cpulimit | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "math" | ||
| "os" | ||
| "path/filepath" | ||
| "strconv" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "golang.org/x/xerrors" | ||
| ) | ||
|
|
||
| type CgroupV2CFSController string | ||
|
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||
| func (basePath CgroupV2CFSController) Usage() (CPUTime, error) { | ||
| usage, err := basePath.getFlatKeyedValue("usage_usec") | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
|
|
||
| return CPUTime(time.Duration(usage) * time.Microsecond), nil | ||
| } | ||
|
|
||
| func (basePath CgroupV2CFSController) SetLimit(limit Bandwidth) (changed bool, err error) { | ||
| quota, period, err := basePath.readCpuMax() | ||
| if err != nil { | ||
| return false, xerrors.Errorf("failed to read cpu max from %s: %w", basePath, err) | ||
| } | ||
|
|
||
| target := limit.Quota(period) | ||
| if quota == target { | ||
| return false, nil | ||
| } | ||
|
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| err = basePath.writeQuota(target) | ||
| if err != nil { | ||
| return false, xerrors.Errorf("cannot set CFS quota of %d (period is %d, parent quota is %d): %w", | ||
| target.Microseconds(), period.Microseconds(), basePath.readParentQuota().Microseconds(), err) | ||
| } | ||
|
|
||
| return true, nil | ||
| } | ||
|
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| func (basePath CgroupV2CFSController) NrThrottled() (uint64, error) { | ||
| throttled, err := basePath.getFlatKeyedValue("nr_throttled") | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
|
|
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| return uint64(throttled), nil | ||
| } | ||
|
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| func (basePath CgroupV2CFSController) readCpuMax() (time.Duration, time.Duration, error) { | ||
| cpuMaxPath := filepath.Join(string(basePath), "cpu.max") | ||
| cpuMax, err := os.ReadFile(cpuMaxPath) | ||
| if err != nil { | ||
| return 0, 0, xerrors.Errorf("unable to read cpu.max: %w", err) | ||
| } | ||
|
|
||
| parts := strings.Fields(string(cpuMax)) | ||
| if len(parts) < 2 { | ||
| return 0, 0, xerrors.Errorf("cpu.max did not have expected number of fields: %s", parts) | ||
| } | ||
|
|
||
| var quota int64 | ||
| if parts[0] == "max" { | ||
| quota = math.MaxInt64 | ||
| } else { | ||
| quota, err = strconv.ParseInt(parts[0], 10, 64) | ||
| if err != nil { | ||
| return 0, 0, xerrors.Errorf("could not parse quota of %s: %w", parts[0], err) | ||
| } | ||
| } | ||
|
|
||
| period, err := strconv.ParseInt(parts[1], 10, 64) | ||
| if err != nil { | ||
| return 0, 0, xerrors.Errorf("could not parse period of %s: %w", parts[1], err) | ||
| } | ||
|
|
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| return time.Duration(quota) * time.Microsecond, time.Duration(period) * time.Microsecond, nil | ||
| } | ||
|
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| func (basePath CgroupV2CFSController) writeQuota(quota time.Duration) error { | ||
| cpuMaxPath := filepath.Join(string(basePath), "cpu.max") | ||
| return os.WriteFile(cpuMaxPath, []byte(strconv.FormatInt(quota.Microseconds(), 10)), 0644) | ||
| } | ||
|
|
||
| func (basePath CgroupV2CFSController) readParentQuota() time.Duration { | ||
| parent := CgroupV2CFSController(filepath.Dir(string(basePath))) | ||
| quota, _, err := parent.readCpuMax() | ||
| if err != nil { | ||
| return time.Duration(0) | ||
| } | ||
|
|
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| return time.Duration(quota) | ||
| } | ||
|
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| func (basePath CgroupV2CFSController) getFlatKeyedValue(key string) (int64, error) { | ||
| stats, err := os.Open(filepath.Join(string(basePath), "cpu.stat")) | ||
| if err != nil { | ||
| return 0, xerrors.Errorf("cannot read cpu.stat: %w", err) | ||
| } | ||
| defer stats.Close() | ||
|
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||
| scanner := bufio.NewScanner(stats) | ||
| for scanner.Scan() { | ||
| entry := scanner.Text() | ||
| if !strings.HasPrefix(entry, key) { | ||
| continue | ||
| } | ||
|
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| r, err := strconv.ParseInt(strings.TrimSpace(strings.TrimPrefix(entry, key)), 10, 64) | ||
| if err != nil { | ||
| return 0, xerrors.Errorf("cannot parse cpu.stat: %s: %w", entry, err) | ||
| } | ||
| return int64(r), nil | ||
| } | ||
| return 0, xerrors.Errorf("cpu.stat did not contain nr_throttled") | ||
| } |
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