diff options
Diffstat (limited to 'vendor/github.com/containerd/cgroups/cgroup.go')
| -rw-r--r-- | vendor/github.com/containerd/cgroups/cgroup.go | 532 |
1 files changed, 0 insertions, 532 deletions
diff --git a/vendor/github.com/containerd/cgroups/cgroup.go b/vendor/github.com/containerd/cgroups/cgroup.go deleted file mode 100644 index 53866685b..000000000 --- a/vendor/github.com/containerd/cgroups/cgroup.go +++ /dev/null @@ -1,532 +0,0 @@ -/* - Copyright The containerd Authors. - - Licensed under the Apache License, Version 2.0 (the "License"); - you may not use this file except in compliance with the License. - You may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0 - - Unless required by applicable law or agreed to in writing, software - distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the License for the specific language governing permissions and - limitations under the License. -*/ - -package cgroups - -import ( - "fmt" - "io/ioutil" - "os" - "path/filepath" - "strconv" - "strings" - "sync" - - specs "github.com/opencontainers/runtime-spec/specs-go" - "github.com/pkg/errors" -) - -// New returns a new control via the cgroup cgroups interface -func New(hierarchy Hierarchy, path Path, resources *specs.LinuxResources, opts ...InitOpts) (Cgroup, error) { - config := newInitConfig() - for _, o := range opts { - if err := o(config); err != nil { - return nil, err - } - } - subsystems, err := hierarchy() - if err != nil { - return nil, err - } - var active []Subsystem - for _, s := range subsystems { - // check if subsystem exists - if err := initializeSubsystem(s, path, resources); err != nil { - if err == ErrControllerNotActive { - if config.InitCheck != nil { - if skerr := config.InitCheck(s, path, err); skerr != nil { - if skerr != ErrIgnoreSubsystem { - return nil, skerr - } - } - } - continue - } - return nil, err - } - active = append(active, s) - } - return &cgroup{ - path: path, - subsystems: active, - }, nil -} - -// Load will load an existing cgroup and allow it to be controlled -func Load(hierarchy Hierarchy, path Path, opts ...InitOpts) (Cgroup, error) { - config := newInitConfig() - for _, o := range opts { - if err := o(config); err != nil { - return nil, err - } - } - var activeSubsystems []Subsystem - subsystems, err := hierarchy() - if err != nil { - return nil, err - } - // check that the subsystems still exist, and keep only those that actually exist - for _, s := range pathers(subsystems) { - p, err := path(s.Name()) - if err != nil { - if os.IsNotExist(errors.Cause(err)) { - return nil, ErrCgroupDeleted - } - if err == ErrControllerNotActive { - if config.InitCheck != nil { - if skerr := config.InitCheck(s, path, err); skerr != nil { - if skerr != ErrIgnoreSubsystem { - return nil, skerr - } - } - } - continue - } - return nil, err - } - if _, err := os.Lstat(s.Path(p)); err != nil { - if os.IsNotExist(err) { - continue - } - return nil, err - } - activeSubsystems = append(activeSubsystems, s) - } - // if we do not have any active systems then the cgroup is deleted - if len(activeSubsystems) == 0 { - return nil, ErrCgroupDeleted - } - return &cgroup{ - path: path, - subsystems: activeSubsystems, - }, nil -} - -type cgroup struct { - path Path - - subsystems []Subsystem - mu sync.Mutex - err error -} - -// New returns a new sub cgroup -func (c *cgroup) New(name string, resources *specs.LinuxResources) (Cgroup, error) { - c.mu.Lock() - defer c.mu.Unlock() - if c.err != nil { - return nil, c.err - } - path := subPath(c.path, name) - for _, s := range c.subsystems { - if err := initializeSubsystem(s, path, resources); err != nil { - return nil, err - } - } - return &cgroup{ - path: path, - subsystems: c.subsystems, - }, nil -} - -// Subsystems returns all the subsystems that are currently being -// consumed by the group -func (c *cgroup) Subsystems() []Subsystem { - return c.subsystems -} - -// Add moves the provided process into the new cgroup -func (c *cgroup) Add(process Process) error { - if process.Pid <= 0 { - return ErrInvalidPid - } - c.mu.Lock() - defer c.mu.Unlock() - if c.err != nil { - return c.err - } - return c.add(process) -} - -func (c *cgroup) add(process Process) error { - for _, s := range pathers(c.subsystems) { - p, err := c.path(s.Name()) - if err != nil { - return err - } - if err := ioutil.WriteFile( - filepath.Join(s.Path(p), cgroupProcs), - []byte(strconv.Itoa(process.Pid)), - defaultFilePerm, - ); err != nil { - return err - } - } - return nil -} - -// AddTask moves the provided tasks (threads) into the new cgroup -func (c *cgroup) AddTask(process Process) error { - if process.Pid <= 0 { - return ErrInvalidPid - } - c.mu.Lock() - defer c.mu.Unlock() - if c.err != nil { - return c.err - } - return c.addTask(process) -} - -func (c *cgroup) addTask(process Process) error { - for _, s := range pathers(c.subsystems) { - p, err := c.path(s.Name()) - if err != nil { - return err - } - if err := ioutil.WriteFile( - filepath.Join(s.Path(p), cgroupTasks), - []byte(strconv.Itoa(process.Pid)), - defaultFilePerm, - ); err != nil { - return err - } - } - return nil -} - -// Delete will remove the control group from each of the subsystems registered -func (c *cgroup) Delete() error { - c.mu.Lock() - defer c.mu.Unlock() - if c.err != nil { - return c.err - } - var errors []string - for _, s := range c.subsystems { - if d, ok := s.(deleter); ok { - sp, err := c.path(s.Name()) - if err != nil { - return err - } - if err := d.Delete(sp); err != nil { - errors = append(errors, string(s.Name())) - } - continue - } - if p, ok := s.(pather); ok { - sp, err := c.path(s.Name()) - if err != nil { - return err - } - path := p.Path(sp) - if err := remove(path); err != nil { - errors = append(errors, path) - } - } - } - if len(errors) > 0 { - return fmt.Errorf("cgroups: unable to remove paths %s", strings.Join(errors, ", ")) - } - c.err = ErrCgroupDeleted - return nil -} - -// Stat returns the current metrics for the cgroup -func (c *cgroup) Stat(handlers ...ErrorHandler) (*Metrics, error) { - c.mu.Lock() - defer c.mu.Unlock() - if c.err != nil { - return nil, c.err - } - if len(handlers) == 0 { - handlers = append(handlers, errPassthrough) - } - var ( - stats = &Metrics{ - CPU: &CPUStat{ - Throttling: &Throttle{}, - Usage: &CPUUsage{}, - }, - } - wg = &sync.WaitGroup{} - errs = make(chan error, len(c.subsystems)) - ) - for _, s := range c.subsystems { - if ss, ok := s.(stater); ok { - sp, err := c.path(s.Name()) - if err != nil { - return nil, err - } - wg.Add(1) - go func() { - defer wg.Done() - if err := ss.Stat(sp, stats); err != nil { - for _, eh := range handlers { - if herr := eh(err); herr != nil { - errs <- herr - } - } - } - }() - } - } - wg.Wait() - close(errs) - for err := range errs { - return nil, err - } - return stats, nil -} - -// Update updates the cgroup with the new resource values provided -// -// Be prepared to handle EBUSY when trying to update a cgroup with -// live processes and other operations like Stats being performed at the -// same time -func (c *cgroup) Update(resources *specs.LinuxResources) error { - c.mu.Lock() - defer c.mu.Unlock() - if c.err != nil { - return c.err - } - for _, s := range c.subsystems { - if u, ok := s.(updater); ok { - sp, err := c.path(s.Name()) - if err != nil { - return err - } - if err := u.Update(sp, resources); err != nil { - return err - } - } - } - return nil -} - -// Processes returns the processes running inside the cgroup along -// with the subsystem used, pid, and path -func (c *cgroup) Processes(subsystem Name, recursive bool) ([]Process, error) { - c.mu.Lock() - defer c.mu.Unlock() - if c.err != nil { - return nil, c.err - } - return c.processes(subsystem, recursive) -} - -func (c *cgroup) processes(subsystem Name, recursive bool) ([]Process, error) { - s := c.getSubsystem(subsystem) - sp, err := c.path(subsystem) - if err != nil { - return nil, err - } - path := s.(pather).Path(sp) - var processes []Process - err = filepath.Walk(path, func(p string, info os.FileInfo, err error) error { - if err != nil { - return err - } - if !recursive && info.IsDir() { - if p == path { - return nil - } - return filepath.SkipDir - } - dir, name := filepath.Split(p) - if name != cgroupProcs { - return nil - } - procs, err := readPids(dir, subsystem) - if err != nil { - return err - } - processes = append(processes, procs...) - return nil - }) - return processes, err -} - -// Tasks returns the tasks running inside the cgroup along -// with the subsystem used, pid, and path -func (c *cgroup) Tasks(subsystem Name, recursive bool) ([]Task, error) { - c.mu.Lock() - defer c.mu.Unlock() - if c.err != nil { - return nil, c.err - } - return c.tasks(subsystem, recursive) -} - -func (c *cgroup) tasks(subsystem Name, recursive bool) ([]Task, error) { - s := c.getSubsystem(subsystem) - sp, err := c.path(subsystem) - if err != nil { - return nil, err - } - path := s.(pather).Path(sp) - var tasks []Task - err = filepath.Walk(path, func(p string, info os.FileInfo, err error) error { - if err != nil { - return err - } - if !recursive && info.IsDir() { - if p == path { - return nil - } - return filepath.SkipDir - } - dir, name := filepath.Split(p) - if name != cgroupTasks { - return nil - } - procs, err := readTasksPids(dir, subsystem) - if err != nil { - return err - } - tasks = append(tasks, procs...) - return nil - }) - return tasks, err -} - -// Freeze freezes the entire cgroup and all the processes inside it -func (c *cgroup) Freeze() error { - c.mu.Lock() - defer c.mu.Unlock() - if c.err != nil { - return c.err - } - s := c.getSubsystem(Freezer) - if s == nil { - return ErrFreezerNotSupported - } - sp, err := c.path(Freezer) - if err != nil { - return err - } - return s.(*freezerController).Freeze(sp) -} - -// Thaw thaws out the cgroup and all the processes inside it -func (c *cgroup) Thaw() error { - c.mu.Lock() - defer c.mu.Unlock() - if c.err != nil { - return c.err - } - s := c.getSubsystem(Freezer) - if s == nil { - return ErrFreezerNotSupported - } - sp, err := c.path(Freezer) - if err != nil { - return err - } - return s.(*freezerController).Thaw(sp) -} - -// OOMEventFD returns the memory cgroup's out of memory event fd that triggers -// when processes inside the cgroup receive an oom event. Returns -// ErrMemoryNotSupported if memory cgroups is not supported. -func (c *cgroup) OOMEventFD() (uintptr, error) { - c.mu.Lock() - defer c.mu.Unlock() - if c.err != nil { - return 0, c.err - } - s := c.getSubsystem(Memory) - if s == nil { - return 0, ErrMemoryNotSupported - } - sp, err := c.path(Memory) - if err != nil { - return 0, err - } - return s.(*memoryController).OOMEventFD(sp) -} - -// State returns the state of the cgroup and its processes -func (c *cgroup) State() State { - c.mu.Lock() - defer c.mu.Unlock() - c.checkExists() - if c.err != nil && c.err == ErrCgroupDeleted { - return Deleted - } - s := c.getSubsystem(Freezer) - if s == nil { - return Thawed - } - sp, err := c.path(Freezer) - if err != nil { - return Unknown - } - state, err := s.(*freezerController).state(sp) - if err != nil { - return Unknown - } - return state -} - -// MoveTo does a recursive move subsystem by subsystem of all the processes -// inside the group -func (c *cgroup) MoveTo(destination Cgroup) error { - c.mu.Lock() - defer c.mu.Unlock() - if c.err != nil { - return c.err - } - for _, s := range c.subsystems { - processes, err := c.processes(s.Name(), true) - if err != nil { - return err - } - for _, p := range processes { - if err := destination.Add(p); err != nil { - if strings.Contains(err.Error(), "no such process") { - continue - } - return err - } - } - } - return nil -} - -func (c *cgroup) getSubsystem(n Name) Subsystem { - for _, s := range c.subsystems { - if s.Name() == n { - return s - } - } - return nil -} - -func (c *cgroup) checkExists() { - for _, s := range pathers(c.subsystems) { - p, err := c.path(s.Name()) - if err != nil { - return - } - if _, err := os.Lstat(s.Path(p)); err != nil { - if os.IsNotExist(err) { - c.err = ErrCgroupDeleted - return - } - } - } -} |