[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/github.com/prometheus/procfs/slab.go b/vendor/github.com/prometheus/procfs/slab.go
new file mode 100644
index 0000000..7896fd7
--- /dev/null
+++ b/vendor/github.com/prometheus/procfs/slab.go
@@ -0,0 +1,151 @@
+// Copyright 2020 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package procfs
+
+import (
+ "bufio"
+ "bytes"
+ "fmt"
+ "regexp"
+ "strconv"
+ "strings"
+
+ "github.com/prometheus/procfs/internal/util"
+)
+
+var (
+ slabSpace = regexp.MustCompile(`\s+`)
+ slabVer = regexp.MustCompile(`slabinfo -`)
+ slabHeader = regexp.MustCompile(`# name`)
+)
+
+// Slab represents a slab pool in the kernel.
+type Slab struct {
+ Name string
+ ObjActive int64
+ ObjNum int64
+ ObjSize int64
+ ObjPerSlab int64
+ PagesPerSlab int64
+ // tunables
+ Limit int64
+ Batch int64
+ SharedFactor int64
+ SlabActive int64
+ SlabNum int64
+ SharedAvail int64
+}
+
+// SlabInfo represents info for all slabs.
+type SlabInfo struct {
+ Slabs []*Slab
+}
+
+func shouldParseSlab(line string) bool {
+ if slabVer.MatchString(line) {
+ return false
+ }
+ if slabHeader.MatchString(line) {
+ return false
+ }
+ return true
+}
+
+// parseV21SlabEntry is used to parse a line from /proc/slabinfo version 2.1.
+func parseV21SlabEntry(line string) (*Slab, error) {
+ // First cleanup whitespace.
+ l := slabSpace.ReplaceAllString(line, " ")
+ s := strings.Split(l, " ")
+ if len(s) != 16 {
+ return nil, fmt.Errorf("unable to parse: %q", line)
+ }
+ var err error
+ i := &Slab{Name: s[0]}
+ i.ObjActive, err = strconv.ParseInt(s[1], 10, 64)
+ if err != nil {
+ return nil, err
+ }
+ i.ObjNum, err = strconv.ParseInt(s[2], 10, 64)
+ if err != nil {
+ return nil, err
+ }
+ i.ObjSize, err = strconv.ParseInt(s[3], 10, 64)
+ if err != nil {
+ return nil, err
+ }
+ i.ObjPerSlab, err = strconv.ParseInt(s[4], 10, 64)
+ if err != nil {
+ return nil, err
+ }
+ i.PagesPerSlab, err = strconv.ParseInt(s[5], 10, 64)
+ if err != nil {
+ return nil, err
+ }
+ i.Limit, err = strconv.ParseInt(s[8], 10, 64)
+ if err != nil {
+ return nil, err
+ }
+ i.Batch, err = strconv.ParseInt(s[9], 10, 64)
+ if err != nil {
+ return nil, err
+ }
+ i.SharedFactor, err = strconv.ParseInt(s[10], 10, 64)
+ if err != nil {
+ return nil, err
+ }
+ i.SlabActive, err = strconv.ParseInt(s[13], 10, 64)
+ if err != nil {
+ return nil, err
+ }
+ i.SlabNum, err = strconv.ParseInt(s[14], 10, 64)
+ if err != nil {
+ return nil, err
+ }
+ i.SharedAvail, err = strconv.ParseInt(s[15], 10, 64)
+ if err != nil {
+ return nil, err
+ }
+ return i, nil
+}
+
+// parseSlabInfo21 is used to parse a slabinfo 2.1 file.
+func parseSlabInfo21(r *bytes.Reader) (SlabInfo, error) {
+ scanner := bufio.NewScanner(r)
+ s := SlabInfo{Slabs: []*Slab{}}
+ for scanner.Scan() {
+ line := scanner.Text()
+ if !shouldParseSlab(line) {
+ continue
+ }
+ slab, err := parseV21SlabEntry(line)
+ if err != nil {
+ return s, err
+ }
+ s.Slabs = append(s.Slabs, slab)
+ }
+ return s, nil
+}
+
+// SlabInfo reads data from /proc/slabinfo
+func (fs FS) SlabInfo() (SlabInfo, error) {
+ // TODO: Consider passing options to allow for parsing different
+ // slabinfo versions. However, slabinfo 2.1 has been stable since
+ // kernel 2.6.10 and later.
+ data, err := util.ReadFileNoStat(fs.proc.Path("slabinfo"))
+ if err != nil {
+ return SlabInfo{}, err
+ }
+
+ return parseSlabInfo21(bytes.NewReader(data))
+}