hugetlb.go

Documentation: github.com/containerd/cgroups

     1  /*
     2     Copyright The containerd Authors.
     3  
     4     Licensed under the Apache License, Version 2.0 (the "License");
     5     you may not use this file except in compliance with the License.
     6     You may obtain a copy of the License at
     7  
     8         http://www.apache.org/licenses/LICENSE-2.0
     9  
    10     Unless required by applicable law or agreed to in writing, software
    11     distributed under the License is distributed on an "AS IS" BASIS,
    12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13     See the License for the specific language governing permissions and
    14     limitations under the License.
    15  */
    16  
    17  package cgroups
    18  
    19  import (
    20  	"os"
    21  	"path/filepath"
    22  	"strconv"
    23  	"strings"
    24  
    25  	v1 "github.com/containerd/cgroups/stats/v1"
    26  	specs "github.com/opencontainers/runtime-spec/specs-go"
    27  )
    28  
    29  func NewHugetlb(root string) (*hugetlbController, error) {
    30  	sizes, err := hugePageSizes()
    31  	if err != nil {
    32  		return nil, err
    33  	}
    34  
    35  	return &hugetlbController{
    36  		root:  filepath.Join(root, string(Hugetlb)),
    37  		sizes: sizes,
    38  	}, nil
    39  }
    40  
    41  type hugetlbController struct {
    42  	root  string
    43  	sizes []string
    44  }
    45  
    46  func (h *hugetlbController) Name() Name {
    47  	return Hugetlb
    48  }
    49  
    50  func (h *hugetlbController) Path(path string) string {
    51  	return filepath.Join(h.root, path)
    52  }
    53  
    54  func (h *hugetlbController) Create(path string, resources *specs.LinuxResources) error {
    55  	if err := os.MkdirAll(h.Path(path), defaultDirPerm); err != nil {
    56  		return err
    57  	}
    58  	for _, limit := range resources.HugepageLimits {
    59  		if err := retryingWriteFile(
    60  			filepath.Join(h.Path(path), strings.Join([]string{"hugetlb", limit.Pagesize, "limit_in_bytes"}, ".")),
    61  			[]byte(strconv.FormatUint(limit.Limit, 10)),
    62  			defaultFilePerm,
    63  		); err != nil {
    64  			return err
    65  		}
    66  	}
    67  	return nil
    68  }
    69  
    70  func (h *hugetlbController) Stat(path string, stats *v1.Metrics) error {
    71  	for _, size := range h.sizes {
    72  		s, err := h.readSizeStat(path, size)
    73  		if err != nil {
    74  			return err
    75  		}
    76  		stats.Hugetlb = append(stats.Hugetlb, s)
    77  	}
    78  	return nil
    79  }
    80  
    81  func (h *hugetlbController) readSizeStat(path, size string) (*v1.HugetlbStat, error) {
    82  	s := v1.HugetlbStat{
    83  		Pagesize: size,
    84  	}
    85  	for _, t := range []struct {
    86  		name  string
    87  		value *uint64
    88  	}{
    89  		{
    90  			name:  "usage_in_bytes",
    91  			value: &s.Usage,
    92  		},
    93  		{
    94  			name:  "max_usage_in_bytes",
    95  			value: &s.Max,
    96  		},
    97  		{
    98  			name:  "failcnt",
    99  			value: &s.Failcnt,
   100  		},
   101  	} {
   102  		v, err := readUint(filepath.Join(h.Path(path), strings.Join([]string{"hugetlb", size, t.name}, ".")))
   103  		if err != nil {
   104  			return nil, err
   105  		}
   106  		*t.value = v
   107  	}
   108  	return &s, nil
   109  }
   110
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