cgroup2: implement containerd.events.TaskOOM event

How to test (from https://github.com/opencontainers/runc/pull/2352#issuecomment-620834524):
  (host)$ sudo swapoff -a
  (host)$ sudo ctr run -t --rm --memory-limit $((1024*1024*32)) docker.io/library/alpine:latest foo
  (container)$ sh -c 'VAR=$(seq 1 100000000)'

An event `/tasks/oom {"container_id":"foo"}` will be displayed in `ctr events`.

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

metrics/cgroups/v2/cgroups.go

@@ -21,10 +21,8 @@ package v2
 import (
 	"context"
 
-	"github.com/containerd/containerd/errdefs"
 	"github.com/containerd/containerd/events"
 	"github.com/containerd/containerd/runtime"
-	"github.com/containerd/containerd/runtime/v1/linux"
 	metrics "github.com/docker/go-metrics"
 )
 
@@ -48,19 +46,6 @@ func (m *cgroupsMonitor) Monitor(c runtime.Task) error {
 	if err := m.collector.Add(c); err != nil {
 		return err
 	}
-	t, ok := c.(*linux.Task)
-	if !ok {
-		return nil
-	}
-	cg, err := t.Cgroup()
-	if err != nil {
-		if errdefs.IsNotFound(err) {
-			return nil
-		}
-		return err
-	}
-	// OOM handler is not implemented yet
-	_ = cg
 	return nil
 }
 

metrics/cgroups/v2/memory.go

@@ -586,4 +586,20 @@ var memoryMetrics = []*metric{
 			}
 		},
 	},
+	{
+		name: "memory_oom",
+		help: "The number of times a container has received an oom event",
+		unit: metrics.Total,
+		vt:   prometheus.GaugeValue,
+		getValues: func(stats *v2.Metrics) []value {
+			if stats.MemoryEvents == nil {
+				return nil
+			}
+			return []value{
+				{
+					v: float64(stats.MemoryEvents.Oom),
+				},
+			}
+		},
+	},
 }

pkg/oom/oom.go

@@ -0,0 +1,30 @@
+// +build linux
+
+/*
+   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 oom
+
+import (
+	"context"
+)
+
+// Watcher watches OOM events
+type Watcher interface {
+	Close() error
+	Run(ctx context.Context)
+	Add(id string, cg interface{}) error
+}

pkg/oom/v1/v1.go

@@ -16,7 +16,7 @@
    limitations under the License.
 */
 
-package oom
+package v1
 
 import (
 	"context"
@@ -24,28 +24,30 @@ import (
 
 	"github.com/containerd/cgroups"
 	eventstypes "github.com/containerd/containerd/api/events"
+	"github.com/containerd/containerd/pkg/oom"
 	"github.com/containerd/containerd/runtime"
 	"github.com/containerd/containerd/runtime/v2/shim"
+	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	"golang.org/x/sys/unix"
 )
 
 // New returns an epoll implementation that listens to OOM events
 // from a container's cgroups.
-func New(publisher shim.Publisher) (*Epoller, error) {
+func New(publisher shim.Publisher) (oom.Watcher, error) {
 	fd, err := unix.EpollCreate1(unix.EPOLL_CLOEXEC)
 	if err != nil {
 		return nil, err
 	}
-	return &Epoller{
+	return &epoller{
 		fd:        fd,
 		publisher: publisher,
 		set:       make(map[uintptr]*item),
 	}, nil
 }
 
-// Epoller implementation for handling OOM events from a container's cgroup
+// epoller implementation for handling OOM events from a container's cgroup
-type Epoller struct {
+type epoller struct {
 	mu sync.Mutex
 
 	fd        int
@@ -59,12 +61,12 @@ type item struct {
 }
 
 // Close the epoll fd
-func (e *Epoller) Close() error {
+func (e *epoller) Close() error {
 	return unix.Close(e.fd)
 }
 
 // Run the epoll loop
-func (e *Epoller) Run(ctx context.Context) {
+func (e *epoller) Run(ctx context.Context) {
 	var events [128]unix.EpollEvent
 	for {
 		select {
@@ -86,8 +88,12 @@ func (e *Epoller) Run(ctx context.Context) {
 	}
 }
 
-// Add the cgroup to the epoll monitor
+// Add cgroups.Cgroup to the epoll monitor
-func (e *Epoller) Add(id string, cg cgroups.Cgroup) error {
+func (e *epoller) Add(id string, cgx interface{}) error {
+	cg, ok := cgx.(cgroups.Cgroup)
+	if !ok {
+		return errors.Errorf("expected cgroups.Cgroup, got: %T", cgx)
+	}
 	e.mu.Lock()
 	defer e.mu.Unlock()
 	fd, err := cg.OOMEventFD()
@@ -105,7 +111,7 @@ func (e *Epoller) Add(id string, cg cgroups.Cgroup) error {
 	return unix.EpollCtl(e.fd, unix.EPOLL_CTL_ADD, int(fd), &event)
 }
 
-func (e *Epoller) process(ctx context.Context, fd uintptr) {
+func (e *epoller) process(ctx context.Context, fd uintptr) {
 	flush(fd)
 	e.mu.Lock()
 	i, ok := e.set[fd]

pkg/oom/v2/v2.go

@@ -0,0 +1,113 @@
+// +build linux
+
+/*
+   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 v2
+
+import (
+	"context"
+
+	cgroupsv2 "github.com/containerd/cgroups/v2"
+	eventstypes "github.com/containerd/containerd/api/events"
+	"github.com/containerd/containerd/pkg/oom"
+	"github.com/containerd/containerd/runtime"
+	"github.com/containerd/containerd/runtime/v2/shim"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+)
+
+// New returns an implementation that listens to OOM events
+// from a container's cgroups.
+func New(publisher shim.Publisher) (oom.Watcher, error) {
+	return &watcher{
+		itemCh:    make(chan item),
+		publisher: publisher,
+	}, nil
+}
+
+// watcher implementation for handling OOM events from a container's cgroup
+type watcher struct {
+	itemCh    chan item
+	publisher shim.Publisher
+}
+
+type item struct {
+	id  string
+	ev  cgroupsv2.Event
+	err error
+}
+
+// Close closes the watcher
+func (w *watcher) Close() error {
+	return nil
+}
+
+// Run the loop
+func (w *watcher) Run(ctx context.Context) {
+	lastOOMMap := make(map[string]uint64) // key: id, value: ev.OOM
+	for {
+		select {
+		case <-ctx.Done():
+			w.Close()
+			return
+		case i := <-w.itemCh:
+			if i.err != nil {
+				delete(lastOOMMap, i.id)
+				continue
+			}
+			lastOOM := lastOOMMap[i.id]
+			if i.ev.OOM > lastOOM {
+				if err := w.publisher.Publish(ctx, runtime.TaskOOMEventTopic, &eventstypes.TaskOOM{
+					ContainerID: i.id,
+				}); err != nil {
+					logrus.WithError(err).Error("publish OOM event")
+				}
+			}
+			if i.ev.OOM > 0 {
+				lastOOMMap[i.id] = i.ev.OOM
+			}
+		}
+	}
+}
+
+// Add cgroups.Cgroup to the epoll monitor
+func (w *watcher) Add(id string, cgx interface{}) error {
+	cg, ok := cgx.(*cgroupsv2.Manager)
+	if !ok {
+		return errors.Errorf("expected *cgroupsv2.Manager, got: %T", cgx)
+	}
+	// FIXME: cgroupsv2.Manager does not support closing eventCh routine currently.
+	// The routine shuts down when an error happens, mostly when the cgroup is deleted.
+	eventCh, errCh := cg.EventChan()
+	go func() {
+		for {
+			i := item{id: id}
+			select {
+			case ev := <-eventCh:
+				i.ev = ev
+				w.itemCh <- i
+			case err := <-errCh:
+				i.err = err
+				w.itemCh <- i
+				// we no longer get any event/err when we got an err
+				logrus.WithError(err).Warn("error from *cgroupsv2.Manager.EventChan")
+				return
+			}
+		}
+	}()
+	return nil
+}

runtime/v2/runc/v1/service.go

@@ -35,6 +35,7 @@ import (
 	"github.com/containerd/containerd/mount"
 	"github.com/containerd/containerd/namespaces"
 	"github.com/containerd/containerd/pkg/oom"
+	oomv1 "github.com/containerd/containerd/pkg/oom/v1"
 	"github.com/containerd/containerd/pkg/process"
 	"github.com/containerd/containerd/pkg/stdio"
 	"github.com/containerd/containerd/runtime/v2/runc"
@@ -58,7 +59,7 @@ var (
 
 // New returns a new shim service that can be used via GRPC
 func New(ctx context.Context, id string, publisher shim.Publisher, shutdown func()) (shim.Shim, error) {
-	ep, err := oom.New(publisher)
+	ep, err := oomv1.New(publisher)
 	if err != nil {
 		return nil, err
 	}
@@ -90,7 +91,7 @@ type service struct {
 	events   chan interface{}
 	platform stdio.Platform
 	ec       chan runcC.Exit
-	ep       *oom.Epoller
+	ep       oom.Watcher
 
 	id        string
 	container *runc.Container

runtime/v2/runc/v2/service.go

@@ -38,6 +38,8 @@ import (
 	"github.com/containerd/containerd/mount"
 	"github.com/containerd/containerd/namespaces"
 	"github.com/containerd/containerd/pkg/oom"
+	oomv1 "github.com/containerd/containerd/pkg/oom/v1"
+	oomv2 "github.com/containerd/containerd/pkg/oom/v2"
 	"github.com/containerd/containerd/pkg/process"
 	"github.com/containerd/containerd/pkg/stdio"
 	"github.com/containerd/containerd/runtime/v2/runc"
@@ -73,7 +75,15 @@ type spec struct {
 
 // New returns a new shim service that can be used via GRPC
 func New(ctx context.Context, id string, publisher shim.Publisher, shutdown func()) (shim.Shim, error) {
-	ep, err := oom.New(publisher)
+	var (
+		ep  oom.Watcher
+		err error
+	)
+	if cgroups.Mode() == cgroups.Unified {
+		ep, err = oomv2.New(publisher)
+	} else {
+		ep, err = oomv1.New(publisher)
+	}
 	if err != nil {
 		return nil, err
 	}
@@ -106,7 +116,7 @@ type service struct {
 	events   chan interface{}
 	platform stdio.Platform
 	ec       chan runcC.Exit
-	ep       *oom.Epoller
+	ep       oom.Watcher
 
 	// id only used in cleanup case
 	id string
@@ -344,9 +354,9 @@ func (s *service) Start(ctx context.Context, r *taskAPI.StartRequest) (*taskAPI.
 					logrus.WithError(err).Errorf("failed to enable controllers (%v)", allControllers)
 				}
 			}
-
+			if err := s.ep.Add(container.ID, cg); err != nil {
-			// OOM monitor is not implemented yet
+				logrus.WithError(err).Error("add cg to OOM monitor")
-			logrus.WithError(errdefs.ErrNotImplemented).Warn("add cg to OOM monitor")
+			}
 		}
 
 		s.send(&eventstypes.TaskStart{

vendor.conf

@@ -2,7 +2,7 @@ github.com/beorn7/perks                             v1.0.1
 github.com/BurntSushi/toml                          v0.3.1
 github.com/cespare/xxhash/v2                        v2.1.1
 github.com/containerd/btrfs                         153935315f4ab9be5bf03650a1341454b05efa5d
-github.com/containerd/cgroups                       b4448137398923af7f4918b8b2ad8249172ca7a6
+github.com/containerd/cgroups                       0dbf7f05ba59274095946e2c0c89540726e8a8aa
 github.com/containerd/console                       v1.0.0
 github.com/containerd/continuity                    d3ef23f19fbb106bb73ffde425d07a9187e30745
 github.com/containerd/fifo                          f15a3290365b9d2627d189e619ab4008e0069caf

vendor/github.com/containerd/cgroups/README.md

@@ -112,6 +112,27 @@ err := control.MoveTo(destination)
 subCgroup, err := control.New("child", resources)
 ```
 
+### Registering for memory events
+
+This allows you to get notified by an eventfd for v1 memory cgroups events.
+
+```go
+event := cgroups.MemoryThresholdEvent(50 * 1024 * 1024, false)
+efd, err := control.RegisterMemoryEvent(event)
+```
+
+```go
+event := cgroups.MemoryPressureEvent(cgroups.MediumPressure, cgroups.DefaultMode)
+efd, err := control.RegisterMemoryEvent(event)
+```
+
+```go
+efd, err := control.OOMEventFD()
+// or by using RegisterMemoryEvent
+event := cgroups.OOMEvent()
+efd, err := control.RegisterMemoryEvent(event)
+```
+
 ### Attention
 
 All static path should not include `/sys/fs/cgroup/` prefix, it should start with your own cgroups name

vendor/github.com/containerd/cgroups/cgroup.go

@@ -458,7 +458,26 @@ func (c *cgroup) OOMEventFD() (uintptr, error) {
 	if err != nil {
 		return 0, err
 	}
-	return s.(*memoryController).OOMEventFD(sp)
+	return s.(*memoryController).memoryEvent(sp, OOMEvent())
+}
+
+// RegisterMemoryEvent allows the ability to register for all v1 memory cgroups
+// notifications.
+func (c *cgroup) RegisterMemoryEvent(event MemoryEvent) (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).memoryEvent(sp, event)
 }
 
 // State returns the state of the cgroup and its processes

vendor/github.com/containerd/cgroups/control.go

@@ -82,6 +82,9 @@ type Cgroup interface {
 	Thaw() error
 	// OOMEventFD returns the memory subsystem's event fd for OOM events
 	OOMEventFD() (uintptr, error)
+	// RegisterMemoryEvent returns the memory subsystems event fd for whatever memory event was
+	// registered for. Can alternatively register for the oom event with this method.
+	RegisterMemoryEvent(MemoryEvent) (uintptr, error)
 	// State returns the cgroups current state
 	State() State
 	// Subsystems returns all the subsystems in the cgroup

vendor/github.com/containerd/cgroups/go.mod

@@ -10,7 +10,7 @@ require (
 	github.com/godbus/dbus/v5 v5.0.3
 	github.com/gogo/protobuf v1.3.1
 	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
-	github.com/opencontainers/runtime-spec v0.1.2-0.20190507144316-5b71a03e2700
+	github.com/opencontainers/runtime-spec v1.0.2
 	github.com/pkg/errors v0.9.1
 	github.com/sirupsen/logrus v1.4.2
 	github.com/stretchr/testify v1.2.2

vendor/github.com/containerd/cgroups/hierarchy.go

@@ -16,5 +16,5 @@
 
 package cgroups
 
-// Hierarchy enableds both unified and split hierarchy for cgroups
+// Hierarchy enables both unified and split hierarchy for cgroups
 type Hierarchy func() ([]Subsystem, error)

vendor/github.com/containerd/cgroups/memory.go

@@ -32,6 +32,128 @@ import (
 	"golang.org/x/sys/unix"
 )
 
+// MemoryEvent is an interface that V1 memory Cgroup notifications implement. Arg returns the
+// file name whose fd should be written to "cgroups.event_control". EventFile returns the name of
+// the file that supports the notification api e.g. "memory.usage_in_bytes".
+type MemoryEvent interface {
+	Arg() string
+	EventFile() string
+}
+
+type memoryThresholdEvent struct {
+	threshold uint64
+	swap      bool
+}
+
+// MemoryThresholdEvent returns a new memory threshold event to be used with RegisterMemoryEvent.
+// If swap is true, the event will be registered using memory.memsw.usage_in_bytes
+func MemoryThresholdEvent(threshold uint64, swap bool) MemoryEvent {
+	return &memoryThresholdEvent{
+		threshold,
+		swap,
+	}
+}
+
+func (m *memoryThresholdEvent) Arg() string {
+	return strconv.FormatUint(m.threshold, 10)
+}
+
+func (m *memoryThresholdEvent) EventFile() string {
+	if m.swap {
+		return "memory.memsw.usage_in_bytes"
+	}
+	return "memory.usage_in_bytes"
+}
+
+type oomEvent struct{}
+
+// OOMEvent returns a new oom event to be used with RegisterMemoryEvent.
+func OOMEvent() MemoryEvent {
+	return &oomEvent{}
+}
+
+func (oom *oomEvent) Arg() string {
+	return ""
+}
+
+func (oom *oomEvent) EventFile() string {
+	return "memory.oom_control"
+}
+
+type memoryPressureEvent struct {
+	pressureLevel MemoryPressureLevel
+	hierarchy     EventNotificationMode
+}
+
+// MemoryPressureEvent returns a new memory pressure event to be used with RegisterMemoryEvent.
+func MemoryPressureEvent(pressureLevel MemoryPressureLevel, hierarchy EventNotificationMode) MemoryEvent {
+	return &memoryPressureEvent{
+		pressureLevel,
+		hierarchy,
+	}
+}
+
+func (m *memoryPressureEvent) Arg() string {
+	return string(m.pressureLevel) + "," + string(m.hierarchy)
+}
+
+func (m *memoryPressureEvent) EventFile() string {
+	return "memory.pressure_level"
+}
+
+// MemoryPressureLevel corresponds to the memory pressure levels defined
+// for memory cgroups.
+type MemoryPressureLevel string
+
+// The three memory pressure levels are as follows.
+//  - The "low" level means that the system is reclaiming memory for new
+//    allocations. Monitoring this reclaiming activity might be useful for
+//    maintaining cache level. Upon notification, the program (typically
+//    "Activity Manager") might analyze vmstat and act in advance (i.e.
+//    prematurely shutdown unimportant services).
+//  - The "medium" level means that the system is experiencing medium memory
+//    pressure, the system might be making swap, paging out active file caches,
+//    etc. Upon this event applications may decide to further analyze
+//    vmstat/zoneinfo/memcg or internal memory usage statistics and free any
+//    resources that can be easily reconstructed or re-read from a disk.
+//  - The "critical" level means that the system is actively thrashing, it is
+//    about to out of memory (OOM) or even the in-kernel OOM killer is on its
+//    way to trigger. Applications should do whatever they can to help the
+//    system. It might be too late to consult with vmstat or any other
+//    statistics, so it is advisable to take an immediate action.
+//    "https://www.kernel.org/doc/Documentation/cgroup-v1/memory.txt" Section 11
+const (
+	LowPressure      MemoryPressureLevel = "low"
+	MediumPressure   MemoryPressureLevel = "medium"
+	CriticalPressure MemoryPressureLevel = "critical"
+)
+
+// EventNotificationMode corresponds to the notification modes
+// for the memory cgroups pressure level notifications.
+type EventNotificationMode string
+
+// There are three optional modes that specify different propagation behavior:
+//  - "default": this is the default behavior specified above. This mode is the
+//    same as omitting the optional mode parameter, preserved by backwards
+//    compatibility.
+//  - "hierarchy": events always propagate up to the root, similar to the default
+//    behavior, except that propagation continues regardless of whether there are
+//    event listeners at each level, with the "hierarchy" mode. In the above
+//    example, groups A, B, and C will receive notification of memory pressure.
+//  - "local": events are pass-through, i.e. they only receive notifications when
+//    memory pressure is experienced in the memcg for which the notification is
+//    registered. In the above example, group C will receive notification if
+//    registered for "local" notification and the group experiences memory
+//    pressure. However, group B will never receive notification, regardless if
+//    there is an event listener for group C or not, if group B is registered for
+//    local notification.
+//    "https://www.kernel.org/doc/Documentation/cgroup-v1/memory.txt" Section 11
+const (
+	DefaultMode   EventNotificationMode = "default"
+	LocalMode     EventNotificationMode = "local"
+	HierarchyMode EventNotificationMode = "hierarchy"
+)
+
 // NewMemory returns a Memory controller given the root folder of cgroups.
 // It may optionally accept other configuration options, such as IgnoreModules(...)
 func NewMemory(root string, options ...func(*memoryController)) *memoryController {
@@ -201,34 +323,6 @@ func (m *memoryController) Stat(path string, stats *v1.Metrics) error {
 	return nil
 }
 
-func (m *memoryController) OOMEventFD(path string) (uintptr, error) {
-	root := m.Path(path)
-	f, err := os.Open(filepath.Join(root, "memory.oom_control"))
-	if err != nil {
-		return 0, err
-	}
-	defer f.Close()
-	fd, _, serr := unix.RawSyscall(unix.SYS_EVENTFD2, 0, unix.EFD_CLOEXEC, 0)
-	if serr != 0 {
-		return 0, serr
-	}
-	if err := writeEventFD(root, f.Fd(), fd); err != nil {
-		unix.Close(int(fd))
-		return 0, err
-	}
-	return fd, nil
-}
-
-func writeEventFD(root string, cfd, efd uintptr) error {
-	f, err := os.OpenFile(filepath.Join(root, "cgroup.event_control"), os.O_WRONLY, 0)
-	if err != nil {
-		return err
-	}
-	_, err = f.WriteString(fmt.Sprintf("%d %d", efd, cfd))
-	f.Close()
-	return err
-}
-
 func (m *memoryController) parseStats(r io.Reader, stat *v1.MemoryStat) error {
 	var (
 		raw  = make(map[string]uint64)
@@ -359,3 +453,24 @@ func getOomControlValue(mem *specs.LinuxMemory) *int64 {
 	}
 	return nil
 }
+
+func (m *memoryController) memoryEvent(path string, event MemoryEvent) (uintptr, error) {
+	root := m.Path(path)
+	efd, err := unix.Eventfd(0, unix.EFD_CLOEXEC)
+	if err != nil {
+		return 0, err
+	}
+	evtFile, err := os.Open(filepath.Join(root, event.EventFile()))
+	if err != nil {
+		unix.Close(efd)
+		return 0, err
+	}
+	defer evtFile.Close()
+	data := fmt.Sprintf("%d %d %s", efd, evtFile.Fd(), event.Arg())
+	evctlPath := filepath.Join(root, "cgroup.event_control")
+	if err := ioutil.WriteFile(evctlPath, []byte(data), 0700); err != nil {
+		unix.Close(efd)
+		return 0, err
+	}
+	return uintptr(efd), nil
+}

vendor/github.com/containerd/cgroups/v2/manager.go

@@ -166,6 +166,9 @@ func writeValues(path string, values []Value) error {
 }
 
 func NewManager(mountpoint string, group string, resources *Resources) (*Manager, error) {
+	if resources == nil {
+		return nil, errors.New("resources reference is nil")
+	}
 	if err := VerifyGroupPath(group); err != nil {
 		return nil, err
 	}
@@ -376,6 +379,12 @@ func (c *Manager) Stat() (*stats.Metrics, error) {
 			return nil, err
 		}
 	}
+	memoryEvents := make(map[string]interface{})
+	if err := readKVStatsFile(c.path, "memory.events", memoryEvents); err != nil {
+		if !os.IsNotExist(err) {
+			return nil, err
+		}
+	}
 	var metrics stats.Metrics
 
 	metrics.Pids = &stats.PidsStat{
@@ -427,7 +436,15 @@ func (c *Manager) Stat() (*stats.Metrics, error) {
 		SwapUsage:             getStatFileContentUint64(filepath.Join(c.path, "memory.swap.current")),
 		SwapLimit:             getStatFileContentUint64(filepath.Join(c.path, "memory.swap.max")),
 	}
-
+	if len(memoryEvents) > 0 {
+		metrics.MemoryEvents = &stats.MemoryEvents{
+			Low:     getUint64Value("low", memoryEvents),
+			High:    getUint64Value("high", memoryEvents),
+			Max:     getUint64Value("max", memoryEvents),
+			Oom:     getUint64Value("oom", memoryEvents),
+			OomKill: getUint64Value("oom_kill", memoryEvents),
+		}
+	}
 	metrics.Io = &stats.IOStat{Usage: readIoStats(c.path)}
 	metrics.Rdma = &stats.RdmaStat{
 		Current: rdmaStats(filepath.Join(c.path, "rdma.current")),
@@ -572,15 +589,44 @@ func (c *Manager) waitForEvents(ec chan<- Event, errCh chan<- error) {
 			errCh <- err
 			return
 		}
-		var out map[string]interface{}
 		if bytesRead >= syscall.SizeofInotifyEvent {
-			if err := readKVStatsFile(c.path, "memory.events", out); err != nil {
+			out := make(map[string]interface{})
-				e := Event{
+			if err := readKVStatsFile(c.path, "memory.events", out); err == nil {
-					High:    out["high"].(uint64),
+				e := Event{}
-					Low:     out["low"].(uint64),
+				if v, ok := out["high"]; ok {
-					Max:     out["max"].(uint64),
+					e.High, ok = v.(uint64)
-					OOM:     out["oom"].(uint64),
+					if !ok {
-					OOMKill: out["oom_kill"].(uint64),
+						errCh <- errors.Errorf("cannot convert high to uint64: %+v", v)
+						return
+					}
+				}
+				if v, ok := out["low"]; ok {
+					e.Low, ok = v.(uint64)
+					if !ok {
+						errCh <- errors.Errorf("cannot convert low to uint64: %+v", v)
+						return
+					}
+				}
+				if v, ok := out["max"]; ok {
+					e.Max, ok = v.(uint64)
+					if !ok {
+						errCh <- errors.Errorf("cannot convert max to uint64: %+v", v)
+						return
+					}
+				}
+				if v, ok := out["oom"]; ok {
+					e.OOM, ok = v.(uint64)
+					if !ok {
+						errCh <- errors.Errorf("cannot convert oom to uint64: %+v", v)
+						return
+					}
+				}
+				if v, ok := out["oom_kill"]; ok {
+					e.OOMKill, ok = v.(uint64)
+					if !ok {
+						errCh <- errors.Errorf("cannot convert oom_kill to uint64: %+v", v)
+						return
+					}
 				}
 				ec <- e
 			} else {

vendor/github.com/containerd/cgroups/v2/stats/metrics.pb.go

@@ -31,6 +31,7 @@ type Metrics struct {
 	Rdma                 *RdmaStat      `protobuf:"bytes,5,opt,name=rdma,proto3" json:"rdma,omitempty"`
 	Io                   *IOStat        `protobuf:"bytes,6,opt,name=io,proto3" json:"io,omitempty"`
 	Hugetlb              []*HugeTlbStat `protobuf:"bytes,7,rep,name=hugetlb,proto3" json:"hugetlb,omitempty"`
+	MemoryEvents         *MemoryEvents  `protobuf:"bytes,8,opt,name=memory_events,json=memoryEvents,proto3" json:"memory_events,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}       `json:"-"`
 	XXX_unrecognized     []byte         `json:"-"`
 	XXX_sizecache        int32          `json:"-"`
@@ -225,6 +226,49 @@ func (m *MemoryStat) XXX_DiscardUnknown() {
 
 var xxx_messageInfo_MemoryStat proto.InternalMessageInfo
 
+type MemoryEvents struct {
+	Low                  uint64   `protobuf:"varint,1,opt,name=low,proto3" json:"low,omitempty"`
+	High                 uint64   `protobuf:"varint,2,opt,name=high,proto3" json:"high,omitempty"`
+	Max                  uint64   `protobuf:"varint,3,opt,name=max,proto3" json:"max,omitempty"`
+	Oom                  uint64   `protobuf:"varint,4,opt,name=oom,proto3" json:"oom,omitempty"`
+	OomKill              uint64   `protobuf:"varint,5,opt,name=oom_kill,json=oomKill,proto3" json:"oom_kill,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *MemoryEvents) Reset()      { *m = MemoryEvents{} }
+func (*MemoryEvents) ProtoMessage() {}
+func (*MemoryEvents) Descriptor() ([]byte, []int) {
+	return fileDescriptor_2fc6005842049e6b, []int{4}
+}
+func (m *MemoryEvents) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *MemoryEvents) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_MemoryEvents.Marshal(b, m, deterministic)
+	} else {
+		b = b[:cap(b)]
+		n, err := m.MarshalTo(b)
+		if err != nil {
+			return nil, err
+		}
+		return b[:n], nil
+	}
+}
+func (m *MemoryEvents) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_MemoryEvents.Merge(m, src)
+}
+func (m *MemoryEvents) XXX_Size() int {
+	return m.Size()
+}
+func (m *MemoryEvents) XXX_DiscardUnknown() {
+	xxx_messageInfo_MemoryEvents.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_MemoryEvents proto.InternalMessageInfo
+
 type RdmaStat struct {
 	Current              []*RdmaEntry `protobuf:"bytes,1,rep,name=current,proto3" json:"current,omitempty"`
 	Limit                []*RdmaEntry `protobuf:"bytes,2,rep,name=limit,proto3" json:"limit,omitempty"`
@@ -236,7 +280,7 @@ type RdmaStat struct {
 func (m *RdmaStat) Reset()      { *m = RdmaStat{} }
 func (*RdmaStat) ProtoMessage() {}
 func (*RdmaStat) Descriptor() ([]byte, []int) {
-	return fileDescriptor_2fc6005842049e6b, []int{4}
+	return fileDescriptor_2fc6005842049e6b, []int{5}
 }
 func (m *RdmaStat) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -277,7 +321,7 @@ type RdmaEntry struct {
 func (m *RdmaEntry) Reset()      { *m = RdmaEntry{} }
 func (*RdmaEntry) ProtoMessage() {}
 func (*RdmaEntry) Descriptor() ([]byte, []int) {
-	return fileDescriptor_2fc6005842049e6b, []int{5}
+	return fileDescriptor_2fc6005842049e6b, []int{6}
 }
 func (m *RdmaEntry) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -316,7 +360,7 @@ type IOStat struct {
 func (m *IOStat) Reset()      { *m = IOStat{} }
 func (*IOStat) ProtoMessage() {}
 func (*IOStat) Descriptor() ([]byte, []int) {
-	return fileDescriptor_2fc6005842049e6b, []int{6}
+	return fileDescriptor_2fc6005842049e6b, []int{7}
 }
 func (m *IOStat) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -360,7 +404,7 @@ type IOEntry struct {
 func (m *IOEntry) Reset()      { *m = IOEntry{} }
 func (*IOEntry) ProtoMessage() {}
 func (*IOEntry) Descriptor() ([]byte, []int) {
-	return fileDescriptor_2fc6005842049e6b, []int{7}
+	return fileDescriptor_2fc6005842049e6b, []int{8}
 }
 func (m *IOEntry) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -401,7 +445,7 @@ type HugeTlbStat struct {
 func (m *HugeTlbStat) Reset()      { *m = HugeTlbStat{} }
 func (*HugeTlbStat) ProtoMessage() {}
 func (*HugeTlbStat) Descriptor() ([]byte, []int) {
-	return fileDescriptor_2fc6005842049e6b, []int{8}
+	return fileDescriptor_2fc6005842049e6b, []int{9}
 }
 func (m *HugeTlbStat) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -435,6 +479,7 @@ func init() {
 	proto.RegisterType((*PidsStat)(nil), "io.containerd.cgroups.v2.PidsStat")
 	proto.RegisterType((*CPUStat)(nil), "io.containerd.cgroups.v2.CPUStat")
 	proto.RegisterType((*MemoryStat)(nil), "io.containerd.cgroups.v2.MemoryStat")
+	proto.RegisterType((*MemoryEvents)(nil), "io.containerd.cgroups.v2.MemoryEvents")
 	proto.RegisterType((*RdmaStat)(nil), "io.containerd.cgroups.v2.RdmaStat")
 	proto.RegisterType((*RdmaEntry)(nil), "io.containerd.cgroups.v2.RdmaEntry")
 	proto.RegisterType((*IOStat)(nil), "io.containerd.cgroups.v2.IOStat")
@@ -447,77 +492,82 @@ func init() {
 }
 
 var fileDescriptor_2fc6005842049e6b = []byte{
-	// 1118 bytes of a gzipped FileDescriptorProto
+	// 1198 bytes of a gzipped FileDescriptorProto
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-	0x9f, 0x00, 0x00, 0x00, 0xff, 0xff, 0x79, 0xd2, 0xcd, 0xe2, 0xab, 0x09, 0x00, 0x00,
+	0x91, 0xc3, 0x5d, 0xc3, 0xbc, 0x84, 0xbd, 0xd6, 0x52, 0x99, 0x66, 0x63, 0xe0, 0x19, 0xb1, 0x23,
+	0xc4, 0xdc, 0xc2, 0xa0, 0xf3, 0x64, 0x0f, 0x46, 0x9d, 0x5f, 0x87, 0xb7, 0x2c, 0x76, 0x7f, 0x51,
+	0x16, 0xda, 0x8b, 0x82, 0xf3, 0x80, 0xa7, 0xc2, 0xc8, 0x57, 0x82, 0x82, 0x1a, 0x86, 0xa7, 0xf2,
+	0xfd, 0xe0, 0xf5, 0x9b, 0xf1, 0xb9, 0x3f, 0xdf, 0x8c, 0xcf, 0xfd, 0x74, 0x32, 0xee, 0xbd, 0x3e,
+	0x19, 0xf7, 0xfe, 0x38, 0x19, 0xf7, 0xfe, 0x3e, 0x19, 0xf7, 0xe6, 0x4b, 0xf4, 0x17, 0xf8, 0xf1,
+	0x3f, 0x01, 0x00, 0x00, 0xff, 0xff, 0x4f, 0x2b, 0x30, 0xd6, 0x6d, 0x0a, 0x00, 0x00,
 }
 
 func (m *Metrics) Marshal() (dAtA []byte, err error) {
@@ -597,6 +647,16 @@ func (m *Metrics) MarshalTo(dAtA []byte) (int, error) {
 			i += n
 		}
 	}
+	if m.MemoryEvents != nil {
+		dAtA[i] = 0x42
+		i++
+		i = encodeVarintMetrics(dAtA, i, uint64(m.MemoryEvents.Size()))
+		n6, err := m.MemoryEvents.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n6
+	}
 	if m.XXX_unrecognized != nil {
 		i += copy(dAtA[i:], m.XXX_unrecognized)
 	}
@@ -921,6 +981,52 @@ func (m *MemoryStat) MarshalTo(dAtA []byte) (int, error) {
 	return i, nil
 }
 
+func (m *MemoryEvents) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalTo(dAtA)
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *MemoryEvents) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	if m.Low != 0 {
+		dAtA[i] = 0x8
+		i++
+		i = encodeVarintMetrics(dAtA, i, uint64(m.Low))
+	}
+	if m.High != 0 {
+		dAtA[i] = 0x10
+		i++
+		i = encodeVarintMetrics(dAtA, i, uint64(m.High))
+	}
+	if m.Max != 0 {
+		dAtA[i] = 0x18
+		i++
+		i = encodeVarintMetrics(dAtA, i, uint64(m.Max))
+	}
+	if m.Oom != 0 {
+		dAtA[i] = 0x20
+		i++
+		i = encodeVarintMetrics(dAtA, i, uint64(m.Oom))
+	}
+	if m.OomKill != 0 {
+		dAtA[i] = 0x28
+		i++
+		i = encodeVarintMetrics(dAtA, i, uint64(m.OomKill))
+	}
+	if m.XXX_unrecognized != nil {
+		i += copy(dAtA[i:], m.XXX_unrecognized)
+	}
+	return i, nil
+}
+
 func (m *RdmaStat) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -1165,6 +1271,10 @@ func (m *Metrics) Size() (n int) {
 			n += 1 + l + sovMetrics(uint64(l))
 		}
 	}
+	if m.MemoryEvents != nil {
+		l = m.MemoryEvents.Size()
+		n += 1 + l + sovMetrics(uint64(l))
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -1336,6 +1446,33 @@ func (m *MemoryStat) Size() (n int) {
 	return n
 }
 
+func (m *MemoryEvents) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	if m.Low != 0 {
+		n += 1 + sovMetrics(uint64(m.Low))
+	}
+	if m.High != 0 {
+		n += 1 + sovMetrics(uint64(m.High))
+	}
+	if m.Max != 0 {
+		n += 1 + sovMetrics(uint64(m.Max))
+	}
+	if m.Oom != 0 {
+		n += 1 + sovMetrics(uint64(m.Oom))
+	}
+	if m.OomKill != 0 {
+		n += 1 + sovMetrics(uint64(m.OomKill))
+	}
+	if m.XXX_unrecognized != nil {
+		n += len(m.XXX_unrecognized)
+	}
+	return n
+}
+
 func (m *RdmaStat) Size() (n int) {
 	if m == nil {
 		return 0
@@ -1476,6 +1613,7 @@ func (this *Metrics) String() string {
 		`Rdma:` + strings.Replace(fmt.Sprintf("%v", this.Rdma), "RdmaStat", "RdmaStat", 1) + `,`,
 		`Io:` + strings.Replace(fmt.Sprintf("%v", this.Io), "IOStat", "IOStat", 1) + `,`,
 		`Hugetlb:` + strings.Replace(fmt.Sprintf("%v", this.Hugetlb), "HugeTlbStat", "HugeTlbStat", 1) + `,`,
+		`MemoryEvents:` + strings.Replace(fmt.Sprintf("%v", this.MemoryEvents), "MemoryEvents", "MemoryEvents", 1) + `,`,
 		`XXX_unrecognized:` + fmt.Sprintf("%v", this.XXX_unrecognized) + `,`,
 		`}`,
 	}, "")
@@ -1554,6 +1692,21 @@ func (this *MemoryStat) String() string {
 	}, "")
 	return s
 }
+func (this *MemoryEvents) String() string {
+	if this == nil {
+		return "nil"
+	}
+	s := strings.Join([]string{`&MemoryEvents{`,
+		`Low:` + fmt.Sprintf("%v", this.Low) + `,`,
+		`High:` + fmt.Sprintf("%v", this.High) + `,`,
+		`Max:` + fmt.Sprintf("%v", this.Max) + `,`,
+		`Oom:` + fmt.Sprintf("%v", this.Oom) + `,`,
+		`OomKill:` + fmt.Sprintf("%v", this.OomKill) + `,`,
+		`XXX_unrecognized:` + fmt.Sprintf("%v", this.XXX_unrecognized) + `,`,
+		`}`,
+	}, "")
+	return s
+}
 func (this *RdmaStat) String() string {
 	if this == nil {
 		return "nil"
@@ -1870,6 +2023,42 @@ func (m *Metrics) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 8:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field MemoryEvents", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowMetrics
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthMetrics
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthMetrics
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.MemoryEvents == nil {
+				m.MemoryEvents = &MemoryEvents{}
+			}
+			if err := m.MemoryEvents.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipMetrics(dAtA[iNdEx:])
@@ -2874,6 +3063,155 @@ func (m *MemoryStat) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *MemoryEvents) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowMetrics
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: MemoryEvents: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: MemoryEvents: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Low", wireType)
+			}
+			m.Low = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowMetrics
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Low |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 2:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field High", wireType)
+			}
+			m.High = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowMetrics
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.High |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Max", wireType)
+			}
+			m.Max = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowMetrics
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Max |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 4:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Oom", wireType)
+			}
+			m.Oom = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowMetrics
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Oom |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 5:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field OomKill", wireType)
+			}
+			m.OomKill = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowMetrics
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.OomKill |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		default:
+			iNdEx = preIndex
+			skippy, err := skipMetrics(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthMetrics
+			}
+			if (iNdEx + skippy) < 0 {
+				return ErrInvalidLengthMetrics
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.XXX_unrecognized = append(m.XXX_unrecognized, dAtA[iNdEx:iNdEx+skippy]...)
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func (m *RdmaStat) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0

vendor/github.com/containerd/cgroups/v2/stats/metrics.proto

@@ -11,6 +11,7 @@ message Metrics {
 	RdmaStat rdma = 5;
 	IOStat io = 6;
 	repeated HugeTlbStat hugetlb = 7;
+	MemoryEvents memory_events = 8;
 }
 
 message PidsStat {
@@ -65,6 +66,14 @@ message MemoryStat {
 	uint64 swap_limit = 35;
 }
 
+message MemoryEvents {
+	uint64 low = 1;
+	uint64 high = 2;
+	uint64 max = 3;
+	uint64 oom = 4;
+	uint64 oom_kill = 5;
+}
+
 message RdmaStat {
 	repeated RdmaEntry current = 1;
 	repeated RdmaEntry limit = 2;