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author | OpenShift Merge Robot <openshift-merge-robot@users.noreply.github.com> | 2021-03-26 19:38:49 +0000 |
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committer | GitHub <noreply@github.com> | 2021-03-26 19:38:49 +0000 |
commit | f3024b906ce717f7858c138a9c1daf72bdb8d132 (patch) | |
tree | 2c1adfa8ca6f622a88f03402dc7ff49524bf388d /vendor/github.com/prometheus/procfs/slab.go | |
parent | c81e273835303664d62c4e958a7f34877c05ed49 (diff) | |
parent | fc197fb4f5c0e0d90da39fe672bce7d145272415 (diff) | |
download | podman-f3024b906ce717f7858c138a9c1daf72bdb8d132.tar.gz podman-f3024b906ce717f7858c138a9c1daf72bdb8d132.tar.bz2 podman-f3024b906ce717f7858c138a9c1daf72bdb8d132.zip |
Merge pull request #9821 from rhatdan/VENDOR
[NO TESTS NEEDED] Vendor in containers/buildah v1.20.0
Diffstat (limited to 'vendor/github.com/prometheus/procfs/slab.go')
-rw-r--r-- | vendor/github.com/prometheus/procfs/slab.go | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/vendor/github.com/prometheus/procfs/slab.go b/vendor/github.com/prometheus/procfs/slab.go new file mode 100644 index 000000000..7896fd724 --- /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)) +} |