35efc4d5f1
Signed-off-by: Stephen J Day <stephen.day@docker.com> Upstream-commit: 554d657c1f7a0f4dce51f0d26407fb05a0580fa1 Component: engine
86 lines
2.0 KiB
Go
86 lines
2.0 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 cgroups
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import (
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"io/ioutil"
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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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specs "github.com/opencontainers/runtime-spec/specs-go"
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)
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func NewPids(root string) *pidsController {
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return &pidsController{
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root: filepath.Join(root, string(Pids)),
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}
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}
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type pidsController struct {
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root string
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}
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func (p *pidsController) Name() Name {
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return Pids
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}
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func (p *pidsController) Path(path string) string {
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return filepath.Join(p.root, path)
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}
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func (p *pidsController) Create(path string, resources *specs.LinuxResources) error {
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if err := os.MkdirAll(p.Path(path), defaultDirPerm); err != nil {
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return err
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}
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if resources.Pids != nil && resources.Pids.Limit > 0 {
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return ioutil.WriteFile(
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filepath.Join(p.Path(path), "pids.max"),
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[]byte(strconv.FormatInt(resources.Pids.Limit, 10)),
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defaultFilePerm,
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)
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}
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return nil
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}
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func (p *pidsController) Update(path string, resources *specs.LinuxResources) error {
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return p.Create(path, resources)
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}
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func (p *pidsController) Stat(path string, stats *Metrics) error {
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current, err := readUint(filepath.Join(p.Path(path), "pids.current"))
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if err != nil {
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return err
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}
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var max uint64
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maxData, err := ioutil.ReadFile(filepath.Join(p.Path(path), "pids.max"))
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if err != nil {
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return err
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}
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if maxS := strings.TrimSpace(string(maxData)); maxS != "max" {
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if max, err = parseUint(maxS, 10, 64); err != nil {
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return err
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}
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}
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stats.Pids = &PidsStat{
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Current: current,
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Limit: max,
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}
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return nil
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}
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