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// Copyright 2018 The gVisor 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 boot
import (
"gvisor.dev/gvisor/pkg/sentry/control"
"gvisor.dev/gvisor/pkg/sentry/usage"
)
// EventOut is the return type of the Event command.
type EventOut struct {
Event Event `json:"event"`
// ContainerUsage maps each container ID to its total CPU usage.
ContainerUsage map[string]uint64 `json:"containerUsage"`
}
// Event struct for encoding the event data to JSON. Corresponds to runc's
// main.event struct.
type Event struct {
Type string `json:"type"`
ID string `json:"id"`
Data Stats `json:"data"`
}
// Stats is the runc specific stats structure for stability when encoding and
// decoding stats.
type Stats struct {
CPU CPU `json:"cpu"`
Memory Memory `json:"memory"`
Pids Pids `json:"pids"`
}
// Pids contains stats on processes.
type Pids struct {
Current uint64 `json:"current,omitempty"`
Limit uint64 `json:"limit,omitempty"`
}
// MemoryEntry contains stats on a kind of memory.
type MemoryEntry struct {
Limit uint64 `json:"limit"`
Usage uint64 `json:"usage,omitempty"`
Max uint64 `json:"max,omitempty"`
Failcnt uint64 `json:"failcnt"`
}
// Memory contains stats on memory.
type Memory struct {
Cache uint64 `json:"cache,omitempty"`
Usage MemoryEntry `json:"usage,omitempty"`
Swap MemoryEntry `json:"swap,omitempty"`
Kernel MemoryEntry `json:"kernel,omitempty"`
KernelTCP MemoryEntry `json:"kernelTCP,omitempty"`
Raw map[string]uint64 `json:"raw,omitempty"`
}
// CPU contains stats on the CPU.
type CPU struct {
Usage CPUUsage `json:"usage"`
}
// CPUUsage contains stats on CPU usage.
type CPUUsage struct {
Kernel uint64 `json:"kernel,omitempty"`
User uint64 `json:"user,omitempty"`
Total uint64 `json:"total,omitempty"`
PerCPU []uint64 `json:"percpu,omitempty"`
}
// Event gets the events from the container.
func (cm *containerManager) Event(_ *struct{}, out *EventOut) error {
*out = EventOut{
Event: Event{
Type: "stats",
},
}
// Memory usage.
// TODO(gvisor.dev/issue/172): Per-container accounting.
mem := cm.l.k.MemoryFile()
mem.UpdateUsage()
_, totalUsage := usage.MemoryAccounting.Copy()
out.Event.Data.Memory.Usage = MemoryEntry{
Usage: totalUsage,
}
// PIDs.
// TODO(gvisor.dev/issue/172): Per-container accounting.
out.Event.Data.Pids.Current = uint64(len(cm.l.k.TaskSet().Root.ThreadGroups()))
// CPU usage by container.
out.ContainerUsage = control.ContainerUsage(cm.l.k)
return nil
}
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