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//go:build linux
package cgroups
import (
"fmt"
"path/filepath"
"strconv"
"github.com/opencontainers/runc/libcontainer/cgroups"
"github.com/opencontainers/runc/libcontainer/cgroups/fs"
"github.com/opencontainers/runc/libcontainer/cgroups/fs2"
"github.com/opencontainers/runc/libcontainer/configs"
)
type linuxMemHandler struct {
Mem fs.MemoryGroup
}
func getMemoryHandler() *linuxMemHandler {
return &linuxMemHandler{}
}
// Apply set the specified constraints
func (c *linuxMemHandler) Apply(ctr *CgroupControl, res *configs.Resources) error {
if ctr.cgroup2 {
man, err := fs2.NewManager(ctr.config, filepath.Join(cgroupRoot, ctr.config.Path))
if err != nil {
return err
}
return man.Set(res)
}
path := filepath.Join(cgroupRoot, Memory, ctr.config.Path)
return c.Mem.Set(path, res)
}
// Create the cgroup
func (c *linuxMemHandler) Create(ctr *CgroupControl) (bool, error) {
if ctr.cgroup2 {
return false, nil
}
return ctr.createCgroupDirectory(Memory)
}
// Destroy the cgroup
func (c *linuxMemHandler) Destroy(ctr *CgroupControl) error {
return rmDirRecursively(ctr.getCgroupv1Path(Memory))
}
// Stat fills a metrics structure with usage stats for the controller
func (c *linuxMemHandler) Stat(ctr *CgroupControl, m *cgroups.Stats) error {
var err error
memUsage := cgroups.MemoryStats{}
var memoryRoot string
var limitFilename string
if ctr.cgroup2 {
memoryRoot = filepath.Join(cgroupRoot, ctr.config.Path)
limitFilename = "memory.max"
if memUsage.Usage.Usage, err = readFileByKeyAsUint64(filepath.Join(memoryRoot, "memory.stat"), "anon"); err != nil {
return err
}
} else {
memoryRoot = ctr.getCgroupv1Path(Memory)
limitFilename = "memory.limit_in_bytes"
path := filepath.Join(memoryRoot, "memory.stat")
values, err := readCgroupMapPath(path)
if err != nil {
return err
}
// cgroup v1 does not have a single "anon" field, but we can calculate it
// from total_active_anon and total_inactive_anon
memUsage.Usage.Usage = 0
for _, key := range []string{"total_active_anon", "total_inactive_anon"} {
if _, found := values[key]; !found {
continue
}
res, err := strconv.ParseUint(values[key][0], 10, 64)
if err != nil {
return fmt.Errorf("parse %s from %s: %w", key, path, err)
}
memUsage.Usage.Usage += res
}
}
memUsage.Usage.Limit, err = readFileAsUint64(filepath.Join(memoryRoot, limitFilename))
if err != nil {
return err
}
m.MemoryStats = memUsage
return nil
}
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