From a031b83a09a8628435317a03f199cdc18b78262f Mon Sep 17 00:00:00 2001
From: Matthew Heon <matthew.heon@gmail.com>
Date: Wed, 1 Nov 2017 11:24:59 -0400
Subject: Initial checkin from CRI-O repo

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
---
 vendor/github.com/containerd/cgroups/hugetlb.go | 92 +++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 vendor/github.com/containerd/cgroups/hugetlb.go

(limited to 'vendor/github.com/containerd/cgroups/hugetlb.go')

diff --git a/vendor/github.com/containerd/cgroups/hugetlb.go b/vendor/github.com/containerd/cgroups/hugetlb.go
new file mode 100644
index 000000000..650bb069f
--- /dev/null
+++ b/vendor/github.com/containerd/cgroups/hugetlb.go
@@ -0,0 +1,92 @@
+package cgroups
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	specs "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+func NewHugetlb(root string) (*hugetlbController, error) {
+	sizes, err := hugePageSizes()
+	if err != nil {
+		return nil, err
+	}
+
+	return &hugetlbController{
+		root:  filepath.Join(root, string(Hugetlb)),
+		sizes: sizes,
+	}, nil
+}
+
+type hugetlbController struct {
+	root  string
+	sizes []string
+}
+
+func (h *hugetlbController) Name() Name {
+	return Hugetlb
+}
+
+func (h *hugetlbController) Path(path string) string {
+	return filepath.Join(h.root, path)
+}
+
+func (h *hugetlbController) Create(path string, resources *specs.LinuxResources) error {
+	if err := os.MkdirAll(h.Path(path), defaultDirPerm); err != nil {
+		return err
+	}
+	for _, limit := range resources.HugepageLimits {
+		if err := ioutil.WriteFile(
+			filepath.Join(h.Path(path), strings.Join([]string{"hugetlb", limit.Pagesize, "limit_in_bytes"}, ".")),
+			[]byte(strconv.FormatUint(limit.Limit, 10)),
+			defaultFilePerm,
+		); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (h *hugetlbController) Stat(path string, stats *Stats) error {
+	stats.Hugetlb = make(map[string]HugetlbStat)
+	for _, size := range h.sizes {
+		s, err := h.readSizeStat(path, size)
+		if err != nil {
+			return err
+		}
+		stats.Hugetlb[size] = s
+	}
+	return nil
+}
+
+func (h *hugetlbController) readSizeStat(path, size string) (HugetlbStat, error) {
+	var s HugetlbStat
+	for _, t := range []struct {
+		name  string
+		value *uint64
+	}{
+		{
+			name:  "usage_in_bytes",
+			value: &s.Usage,
+		},
+		{
+			name:  "max_usage_in_bytes",
+			value: &s.Max,
+		},
+		{
+			name:  "failcnt",
+			value: &s.Failcnt,
+		},
+	} {
+		v, err := readUint(filepath.Join(h.Path(path), strings.Join([]string{"hugetlb", size, t.name}, ".")))
+		if err != nil {
+			return s, err
+		}
+		*t.value = v
+	}
+	return s, nil
+}
-- 
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