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// Copyright 2020 The gVisor 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 tools
import (
"fmt"
"regexp"
"strconv"
"testing"
)
// Meminfo wraps measurements of MemAvailable using /proc/meminfo.
type Meminfo struct {
}
// MakeCmd returns a command for checking meminfo.
func (*Meminfo) MakeCmd() (string, []string) {
return "cat", []string{"/proc/meminfo"}
}
// Report takes two reads of meminfo, parses them, and reports the difference
// divided by b.N.
func (*Meminfo) Report(b *testing.B, before, after string) {
b.Helper()
beforeVal, err := parseMemAvailable(before)
if err != nil {
b.Fatalf("could not parse before value %s: %v", before, err)
}
afterVal, err := parseMemAvailable(after)
if err != nil {
b.Fatalf("could not parse before value %s: %v", before, err)
}
val := 1024 * ((beforeVal - afterVal) / float64(b.N))
ReportCustomMetric(b, val, "average_container_size" /*metric name*/, "bytes" /*units*/)
}
var memInfoRE = regexp.MustCompile(`MemAvailable:\s*(\d+)\skB\n`)
// parseMemAvailable grabs the MemAvailable number from /proc/meminfo.
func parseMemAvailable(data string) (float64, error) {
match := memInfoRE.FindStringSubmatch(data)
if len(match) < 2 {
return 0, fmt.Errorf("couldn't find MemAvailable in %s", data)
}
return strconv.ParseFloat(match[1], 64)
}
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