2020-05-06 01:06:46 +00:00
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// Copyright 2018 The containerd Authors.
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// Copyright 2018 The gVisor Authors.
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//
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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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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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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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2020-04-27 22:03:12 +00:00
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2021-07-20 23:24:59 +00:00
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//go:build linux
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2020-05-06 01:06:46 +00:00
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// +build linux
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2020-04-27 22:03:12 +00:00
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2021-01-13 01:50:33 +00:00
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package shim
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2020-04-27 22:03:12 +00:00
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import (
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"context"
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2020-05-06 05:00:14 +00:00
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"fmt"
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2020-04-27 22:03:12 +00:00
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"sync"
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"github.com/containerd/cgroups"
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"github.com/containerd/containerd/events"
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"github.com/containerd/containerd/runtime"
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"golang.org/x/sys/unix"
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)
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func newOOMEpoller(publisher events.Publisher) (*epoller, error) {
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fd, err := unix.EpollCreate1(unix.EPOLL_CLOEXEC)
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if err != nil {
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return nil, err
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}
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return &epoller{
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fd: fd,
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publisher: publisher,
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set: make(map[uintptr]*item),
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}, nil
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}
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type epoller struct {
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mu sync.Mutex
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fd int
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publisher events.Publisher
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set map[uintptr]*item
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}
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type item struct {
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id string
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cg cgroups.Cgroup
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}
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func (e *epoller) Close() error {
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return unix.Close(e.fd)
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}
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func (e *epoller) run(ctx context.Context) {
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var events [128]unix.EpollEvent
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for {
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select {
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case <-ctx.Done():
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e.Close()
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return
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default:
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n, err := unix.EpollWait(e.fd, events[:], -1)
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if err != nil {
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2020-07-13 23:10:58 +00:00
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if err == unix.EINTR || err == unix.EAGAIN {
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2020-04-27 22:03:12 +00:00
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continue
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}
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2020-07-13 23:10:58 +00:00
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// Should not happen.
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panic(fmt.Errorf("cgroups: epoll wait: %w", err))
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2020-04-27 22:03:12 +00:00
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}
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for i := 0; i < n; i++ {
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e.process(ctx, uintptr(events[i].Fd))
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}
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}
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}
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}
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2021-11-02 15:20:58 +00:00
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func (e *epoller) add(id string, cgx interface{}) error {
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2020-04-27 22:03:12 +00:00
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e.mu.Lock()
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defer e.mu.Unlock()
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2021-11-02 15:20:58 +00:00
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cg, ok := cgx.(cgroups.Cgroup)
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if !ok {
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return fmt.Errorf("expected cgroups.Cgroup, got: %T", cgx)
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}
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2020-04-27 22:03:12 +00:00
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fd, err := cg.OOMEventFD()
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if err != nil {
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return err
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}
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e.set[fd] = &item{
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id: id,
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cg: cg,
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}
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event := unix.EpollEvent{
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Fd: int32(fd),
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Events: unix.EPOLLHUP | unix.EPOLLIN | unix.EPOLLERR,
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}
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return unix.EpollCtl(e.fd, unix.EPOLL_CTL_ADD, int(fd), &event)
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}
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func (e *epoller) process(ctx context.Context, fd uintptr) {
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flush(fd)
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e.mu.Lock()
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i, ok := e.set[fd]
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if !ok {
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e.mu.Unlock()
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return
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}
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e.mu.Unlock()
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if i.cg.State() == cgroups.Deleted {
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e.mu.Lock()
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delete(e.set, fd)
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e.mu.Unlock()
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unix.Close(int(fd))
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return
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}
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2020-07-13 23:10:58 +00:00
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if err := e.publisher.Publish(ctx, runtime.TaskOOMEventTopic, &TaskOOM{
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2020-04-27 22:03:12 +00:00
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ContainerID: i.id,
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}); err != nil {
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2020-07-13 23:10:58 +00:00
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// Should not happen.
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panic(fmt.Errorf("publish OOM event: %w", err))
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2020-04-27 22:03:12 +00:00
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}
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}
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func flush(fd uintptr) error {
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var buf [8]byte
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_, err := unix.Read(int(fd), buf[:])
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return err
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}
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