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package fs
import (
"errors"
"os"
"strconv"
"github.com/opencontainers/cgroups"
"github.com/opencontainers/cgroups/fscommon"
)
type HugetlbGroup struct{}
func (s *HugetlbGroup) Name() string {
return "hugetlb"
}
func (s *HugetlbGroup) Apply(path string, _ *cgroups.Resources, pid int) error {
return apply(path, pid)
}
func (s *HugetlbGroup) Set(path string, r *cgroups.Resources) error {
const suffix = ".limit_in_bytes"
skipRsvd := false
for _, hugetlb := range r.HugetlbLimit {
prefix := "hugetlb." + hugetlb.Pagesize
val := strconv.FormatUint(hugetlb.Limit, 10)
if err := cgroups.WriteFile(path, prefix+suffix, val); err != nil {
return err
}
if skipRsvd {
continue
}
if err := cgroups.WriteFile(path, prefix+".rsvd"+suffix, val); err != nil {
if errors.Is(err, os.ErrNotExist) {
skipRsvd = true
continue
}
return err
}
}
return nil
}
func (s *HugetlbGroup) GetStats(path string, stats *cgroups.Stats) error {
if !cgroups.PathExists(path) {
return nil
}
rsvd := ".rsvd"
hugetlbStats := cgroups.HugetlbStats{}
for _, pageSize := range cgroups.HugePageSizes() {
again:
prefix := "hugetlb." + pageSize + rsvd
value, err := fscommon.GetCgroupParamUint(path, prefix+".usage_in_bytes")
if err != nil {
if rsvd != "" && errors.Is(err, os.ErrNotExist) {
rsvd = ""
goto again
}
return err
}
hugetlbStats.Usage = value
value, err = fscommon.GetCgroupParamUint(path, prefix+".max_usage_in_bytes")
if err != nil {
return err
}
hugetlbStats.MaxUsage = value
value, err = fscommon.GetCgroupParamUint(path, prefix+".failcnt")
if err != nil {
return err
}
hugetlbStats.Failcnt = value
stats.HugetlbStats[pageSize] = hugetlbStats
}
return nil
}
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