Update vendoring. (#1257)

* Update vendoring.

Update vendoring to latest upstream.

Signed-off-by: Ben Kochie <superq@gmail.com>

vendor/github.com/prometheus/procfs/fixtures.ttar

@@ -404,6 +404,26 @@ XfrmOutStateInvalid             28765
 XfrmAcquireError                24532
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Directory: fixtures/pressure
+Mode: 755
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/pressure/cpu
+Lines: 1
+some avg10=0.10 avg60=2.00 avg300=3.85 total=15
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/pressure/io
+Lines: 2
+some avg10=0.10 avg60=2.00 avg300=3.85 total=15
+full avg10=0.20 avg60=3.00 avg300=4.95 total=25
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/pressure/memory
+Lines: 2
+some avg10=0.10 avg60=2.00 avg300=3.85 total=15
+full avg10=0.20 avg60=3.00 avg300=4.95 total=25
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: fixtures/self
 SymlinkTo: 26231
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -458,5 +478,5 @@ Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: fixtures/.unpacked
 Lines: 0
-Mode: 664
+Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

vendor/github.com/prometheus/procfs/go.mod

@@ -1 +1,3 @@
 module github.com/prometheus/procfs
+
+require golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4

vendor/github.com/prometheus/procfs/go.sum

@@ -0,0 +1,2 @@
+golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4 h1:YUO/7uOKsKeq9UokNS62b8FYywz3ker1l1vDZRCRefw=
+golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=

vendor/github.com/prometheus/procfs/proc_psi.go

@@ -0,0 +1,110 @@
+// Copyright 2019 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
+
+// The PSI / pressure interface is described at
+//   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/accounting/psi.txt
+// Each resource (cpu, io, memory, ...) is exposed as a single file.
+// Each file may contain up to two lines, one for "some" pressure and one for "full" pressure.
+// Each line contains several averages (over n seconds) and a total in µs.
+//
+// Example io pressure file:
+// > some avg10=0.06 avg60=0.21 avg300=0.99 total=8537362
+// > full avg10=0.00 avg60=0.13 avg300=0.96 total=8183134
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"strings"
+)
+
+const lineFormat = "avg10=%f avg60=%f avg300=%f total=%d"
+
+// PSILine is a single line of values as returned by /proc/pressure/*
+// The Avg entries are averages over n seconds, as a percentage
+// The Total line is in microseconds
+type PSILine struct {
+	Avg10  float64
+	Avg60  float64
+	Avg300 float64
+	Total  uint64
+}
+
+// PSIStats represent pressure stall information from /proc/pressure/*
+// Some indicates the share of time in which at least some tasks are stalled
+// Full indicates the share of time in which all non-idle tasks are stalled simultaneously
+type PSIStats struct {
+	Some *PSILine
+	Full *PSILine
+}
+
+// NewPSIStatsForResource reads pressure stall information for the specified
+// resource. At time of writing this can be either "cpu", "memory" or "io".
+func NewPSIStatsForResource(resource string) (PSIStats, error) {
+	fs, err := NewFS(DefaultMountPoint)
+	if err != nil {
+		return PSIStats{}, err
+	}
+
+	return fs.NewPSIStatsForResource(resource)
+}
+
+// NewPSIStatsForResource reads pressure stall information from /proc/pressure/<resource>
+func (fs FS) NewPSIStatsForResource(resource string) (PSIStats, error) {
+	file, err := os.Open(fs.Path(fmt.Sprintf("%s/%s", "pressure", resource)))
+	if err != nil {
+		return PSIStats{}, fmt.Errorf("psi_stats: unavailable for %s", resource)
+	}
+
+	defer file.Close()
+	return parsePSIStats(resource, file)
+}
+
+// parsePSIStats parses the specified file for pressure stall information
+func parsePSIStats(resource string, file io.Reader) (PSIStats, error) {
+	psiStats := PSIStats{}
+	stats, err := ioutil.ReadAll(file)
+	if err != nil {
+		return psiStats, fmt.Errorf("psi_stats: unable to read data for %s", resource)
+	}
+
+	for _, l := range strings.Split(string(stats), "\n") {
+		prefix := strings.Split(l, " ")[0]
+		switch prefix {
+		case "some":
+			psi := PSILine{}
+			_, err := fmt.Sscanf(l, fmt.Sprintf("some %s", lineFormat), &psi.Avg10, &psi.Avg60, &psi.Avg300, &psi.Total)
+			if err != nil {
+				return PSIStats{}, err
+			}
+			psiStats.Some = &psi
+		case "full":
+			psi := PSILine{}
+			_, err := fmt.Sscanf(l, fmt.Sprintf("full %s", lineFormat), &psi.Avg10, &psi.Avg60, &psi.Avg300, &psi.Total)
+			if err != nil {
+				return PSIStats{}, err
+			}
+			psiStats.Full = &psi
+		default:
+			// If we encounter a line with an unknown prefix, ignore it and move on
+			// Should new measurement types be added in the future we'll simply ignore them instead
+			// of erroring on retrieval
+			continue
+		}
+	}
+
+	return psiStats, nil
+}

vendor/github.com/prometheus/procfs/sysfs/system_cpu.go

@@ -20,6 +20,8 @@ import (
 	"path/filepath"
 	"strings"
 
+	"golang.org/x/sync/errgroup"
+
 	"github.com/prometheus/procfs/internal/util"
 )
 
@@ -35,7 +37,7 @@ type SystemCPUCpufreqStats struct {
 	ScalingMaximumFrequency  *uint64
 	AvailableGovernors       string
 	Driver                   string
-	Govenor                  string
+	Governor                 string
 	RelatedCpus              string
 	SetSpeed                 string
 }
@@ -56,32 +58,41 @@ func NewSystemCpufreq() ([]SystemCPUCpufreqStats, error) {
 
 // NewSystemCpufreq returns CPU frequency metrics for all CPUs.
 func (fs FS) NewSystemCpufreq() ([]SystemCPUCpufreqStats, error) {
-	var cpufreq = &SystemCPUCpufreqStats{}
+	var g errgroup.Group
 
 	cpus, err := filepath.Glob(fs.Path("devices/system/cpu/cpu[0-9]*"))
 	if err != nil {
-		return []SystemCPUCpufreqStats{}, err
+		return nil, err
 	}
 
-	systemCpufreq := []SystemCPUCpufreqStats{}
-	for _, cpu := range cpus {
-		cpuName := filepath.Base(cpu)
-		cpuNum := strings.TrimPrefix(cpuName, "cpu")
+	systemCpufreq := make([]SystemCPUCpufreqStats, len(cpus))
+	for i, cpu := range cpus {
+		cpuName := strings.TrimPrefix(filepath.Base(cpu), "cpu")
 
 		cpuCpufreqPath := filepath.Join(cpu, "cpufreq")
 		if _, err := os.Stat(cpuCpufreqPath); os.IsNotExist(err) {
 			continue
 		}
 		if err != nil {
-			return []SystemCPUCpufreqStats{}, err
+			return nil, err
 		}
 
-		cpufreq, err = parseCpufreqCpuinfo(cpuCpufreqPath)
-		if err != nil {
-			return []SystemCPUCpufreqStats{}, err
-		}
-		cpufreq.Name = cpuNum
-		systemCpufreq = append(systemCpufreq, *cpufreq)
+		// Execute the parsing of each CPU in parallel.
+		// This is done because the kernel intentionally delays access to each CPU by
+		// 50 milliseconds to avoid DDoSing possibly expensive functions.
+		i := i // https://golang.org/doc/faq#closures_and_goroutines
+		g.Go(func() error {
+			cpufreq, err := parseCpufreqCpuinfo(cpuCpufreqPath)
+			if err == nil {
+				cpufreq.Name = cpuName
+				systemCpufreq[i] = *cpufreq
+			}
+			return err
+		})
+	}
+
+	if err = g.Wait(); err != nil {
+		return nil, err
 	}
 
 	return systemCpufreq, nil
@@ -138,7 +149,7 @@ func parseCpufreqCpuinfo(cpuPath string) (*SystemCPUCpufreqStats, error) {
 		ScalingMinimumFrequency:  uintOut[6],
 		AvailableGovernors:       stringOut[0],
 		Driver:                   stringOut[1],
-		Govenor:                  stringOut[2],
+		Governor:                 stringOut[2],
 		RelatedCpus:              stringOut[3],
 		SetSpeed:                 stringOut[4],
 	}, nil