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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/kernel"
"gvisor.dev/gvisor/pkg/sentry/usage"
)
// 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 interface{} `json:"data,omitempty"`
}
// Stats is the runc specific stats structure for stability when encoding and
// decoding stats.
type Stats struct {
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"`
}
// Event gets the events from the container.
func (cm *containerManager) Event(_ *struct{}, out *Event) error {
stats := &Stats{}
stats.populateMemory(cm.l.k)
stats.populatePIDs(cm.l.k)
*out = Event{Type: "stats", Data: stats}
return nil
}
func (s *Stats) populateMemory(k *kernel.Kernel) {
mem := k.MemoryFile()
mem.UpdateUsage()
_, totalUsage := usage.MemoryAccounting.Copy()
s.Memory.Usage = MemoryEntry{
Usage: totalUsage,
}
}
func (s *Stats) populatePIDs(k *kernel.Kernel) {
s.Pids.Current = uint64(len(k.TaskSet().Root.ThreadGroups()))
}
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