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package cgroups
import (
"fmt"
"os"
"path/filepath"
spec "github.com/opencontainers/runtime-spec/specs-go"
)
type memHandler struct {
}
func getMemoryHandler() *memHandler {
return &memHandler{}
}
// Apply set the specified constraints
func (c *memHandler) Apply(ctr *CgroupControl, res *spec.LinuxResources) error {
if res.Memory == nil {
return nil
}
return fmt.Errorf("memory apply not implemented yet")
}
// Create the cgroup
func (c *memHandler) Create(ctr *CgroupControl) (bool, error) {
if ctr.cgroup2 {
return false, nil
}
return ctr.createCgroupDirectory(Memory)
}
// Destroy the cgroup
func (c *memHandler) Destroy(ctr *CgroupControl) error {
return os.Remove(ctr.getCgroupv1Path(Memory))
}
// Stat fills a metrics structure with usage stats for the controller
func (c *memHandler) Stat(ctr *CgroupControl, m *Metrics) error {
var err error
usage := MemoryUsage{}
var memoryRoot string
filenames := map[string]string{}
if ctr.cgroup2 {
memoryRoot = filepath.Join(cgroupRoot, ctr.path)
filenames["usage"] = "memory.current"
filenames["limit"] = "memory.max"
} else {
memoryRoot = ctr.getCgroupv1Path(Memory)
filenames["usage"] = "memory.usage_in_bytes"
filenames["limit"] = "memory.limit_in_bytes"
}
usage.Usage, err = readFileAsUint64(filepath.Join(memoryRoot, filenames["usage"]))
if err != nil {
return err
}
usage.Limit, err = readFileAsUint64(filepath.Join(memoryRoot, filenames["limit"]))
if err != nil {
return err
}
m.Memory = MemoryMetrics{Usage: usage}
return nil
}
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