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cgroups.go
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cgroups.go
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// +build linux
package cgroups
import (
"github.com/containerd/cgroups"
eventsapi "github.com/containerd/containerd/api/services/events/v1"
"github.com/containerd/containerd/events"
"github.com/containerd/containerd/log"
"github.com/containerd/containerd/plugin"
"github.com/containerd/containerd/runtime"
metrics "github.com/docker/go-metrics"
"golang.org/x/net/context"
)
func init() {
plugin.Register(&plugin.Registration{
Type: plugin.TaskMonitorPlugin,
ID: "cgroups",
Init: New,
})
}
func New(ic *plugin.InitContext) (interface{}, error) {
var (
ns = metrics.NewNamespace("container", "", nil)
collector = NewCollector(ns)
)
oom, err := NewOOMCollector(ns)
if err != nil {
return nil, err
}
metrics.Register(ns)
return &cgroupsMonitor{
collector: collector,
oom: oom,
context: ic.Context,
publisher: ic.Events,
}, nil
}
type cgroupsMonitor struct {
collector *Collector
oom *OOMCollector
context context.Context
publisher events.Publisher
}
func (m *cgroupsMonitor) Monitor(c runtime.Task) error {
info := c.Info()
state, err := c.State(m.context)
if err != nil {
return err
}
cg, err := cgroups.Load(cgroups.V1, cgroups.PidPath(int(state.Pid)))
if err != nil {
return err
}
if err := m.collector.Add(info.ID, info.Namespace, cg); err != nil {
return err
}
return m.oom.Add(info.ID, info.Namespace, cg, m.trigger)
}
func (m *cgroupsMonitor) Stop(c runtime.Task) error {
info := c.Info()
m.collector.Remove(info.ID, info.Namespace)
return nil
}
func (m *cgroupsMonitor) trigger(id string, cg cgroups.Cgroup) {
if err := m.publisher.Publish(m.context, runtime.TaskOOMEventTopic, &eventsapi.TaskOOM{
ContainerID: id,
}); err != nil {
log.G(m.context).WithError(err).Error("post OOM event")
}
}