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// +build linux
package fs
import (
"fmt"
"strconv"
"strings"
"github.com/opencontainers/runc/libcontainer/cgroups"
"github.com/opencontainers/runc/libcontainer/configs"
)
type HugetlbGroup struct {
}
func (s *HugetlbGroup) Name() string {
return "hugetlb"
}
func (s *HugetlbGroup) Apply(d *cgroupData) error {
_, err := d.join("hugetlb")
if err != nil && !cgroups.IsNotFound(err) {
return err
}
return nil
}
func (s *HugetlbGroup) Set(path string, cgroup *configs.Cgroup) error {
for _, hugetlb := range cgroup.Resources.HugetlbLimit {
if err := writeFile(path, strings.Join([]string{"hugetlb", hugetlb.Pagesize, "limit_in_bytes"}, "."), strconv.FormatUint(hugetlb.Limit, 10)); err != nil {
return err
}
}
return nil
}
func (s *HugetlbGroup) Remove(d *cgroupData) error {
return removePath(d.path("hugetlb"))
}
func (s *HugetlbGroup) GetStats(path string, stats *cgroups.Stats) error {
hugetlbStats := cgroups.HugetlbStats{}
for _, pageSize := range HugePageSizes {
usage := strings.Join([]string{"hugetlb", pageSize, "usage_in_bytes"}, ".")
value, err := getCgroupParamUint(path, usage)
if err != nil {
return fmt.Errorf("failed to parse %s - %v", usage, err)
}
hugetlbStats.Usage = value
maxUsage := strings.Join([]string{"hugetlb", pageSize, "max_usage_in_bytes"}, ".")
value, err = getCgroupParamUint(path, maxUsage)
if err != nil {
return fmt.Errorf("failed to parse %s - %v", maxUsage, err)
}
hugetlbStats.MaxUsage = value
failcnt := strings.Join([]string{"hugetlb", pageSize, "failcnt"}, ".")
value, err = getCgroupParamUint(path, failcnt)
if err != nil {
return fmt.Errorf("failed to parse %s - %v", failcnt, err)
}
hugetlbStats.Failcnt = value
stats.HugetlbStats[pageSize] = hugetlbStats
}
return nil
}
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