mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-04 22:36:34 +00:00
98 lines
2.1 KiB
Go
98 lines
2.1 KiB
Go
//go:build linux
|
|
// +build linux
|
|
|
|
package memlimit
|
|
|
|
import (
|
|
"math"
|
|
"os"
|
|
"path/filepath"
|
|
|
|
"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:
|
|
return FromCgroupHybrid()
|
|
case 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
|
|
}
|
|
|
|
if limit := metrics.GetMemory().GetHierarchicalMemoryLimit(); limit != 0 && limit != getCgroupV1NoLimit() {
|
|
return limit, nil
|
|
}
|
|
|
|
return 0, ErrNoLimit
|
|
}
|
|
|
|
func getCgroupV1NoLimit() uint64 {
|
|
ps := uint64(os.Getpagesize())
|
|
return math.MaxInt64 / ps * ps
|
|
}
|
|
|
|
// FromCgroupHybrid returns the memory limit from the cgroup v1 or v2.
|
|
// It checks the cgroup v2 first, and if it fails, it falls back to cgroup v1.
|
|
func FromCgroupHybrid() (uint64, error) {
|
|
limit, err := fromCgroupV2(filepath.Join(cgroupMountPoint, "unified"))
|
|
if err == nil {
|
|
return limit, nil
|
|
} else if err != ErrNoLimit {
|
|
return 0, err
|
|
}
|
|
|
|
return FromCgroupV1()
|
|
}
|
|
|
|
// FromCgroupV2 returns the memory limit from the cgroup v2.
|
|
func FromCgroupV2() (uint64, error) {
|
|
return fromCgroupV2(cgroupMountPoint)
|
|
}
|
|
|
|
func fromCgroupV2(mountPoint string) (uint64, error) {
|
|
path, err := cgroup2.NestedGroupPath("")
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
m, err := cgroup2.Load(path, cgroup2.WithMountpoint(mountPoint))
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
stats, err := m.Stat()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
if limit := stats.GetMemory().GetUsageLimit(); limit != 0 && limit != math.MaxUint64 {
|
|
return limit, nil
|
|
}
|
|
|
|
return 0, ErrNoLimit
|
|
}
|