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//go:build linux
// +build linux
package memlimit
import (
"github.com/containerd/cgroups/v3"
"github.com/containerd/cgroups/v3/cgroup1"
"github.com/containerd/cgroups/v3/cgroup2"
)
const (
cgroupMountPoint = "/sys/fs/cgroup"
)
// FromCgroup returns the memory limit based on the cgroups version on this system.
func FromCgroup() (uint64, error) {
switch cgroups.Mode() {
case cgroups.Legacy:
return FromCgroupV1()
case cgroups.Hybrid, cgroups.Unified:
return FromCgroupV2()
}
return 0, ErrNoCgroup
}
// FromCgroupV1 returns the memory limit from the cgroup v1.
func FromCgroupV1() (uint64, error) {
cg, err := cgroup1.Load(cgroup1.RootPath, cgroup1.WithHiearchy(
cgroup1.SingleSubsystem(cgroup1.Default, cgroup1.Memory),
))
if err != nil {
return 0, err
}
metrics, err := cg.Stat(cgroup1.IgnoreNotExist)
if err != nil {
return 0, err
} else if metrics.Memory == nil {
return 0, ErrNoLimit
}
return metrics.Memory.HierarchicalMemoryLimit, nil
}
// FromCgroupV2 returns the memory limit from the cgroup v2.
func FromCgroupV2() (uint64, error) {
path, err := cgroup2.NestedGroupPath("")
if err != nil {
return 0, err
}
m, err := cgroup2.Load(path, cgroup2.WithMountpoint(cgroupMountPoint))
if err != nil {
return 0, err
}
stats, err := m.Stat()
if err != nil {
return 0, err
} else if stats.Memory == nil {
return 0, ErrNoLimit
}
return stats.Memory.UsageLimit, nil
}
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