1 files changed, 60 insertions, 0 deletions
diff --git a/test/benchmarks/tools/meminfo.go b/test/benchmarks/tools/meminfo.go
new file mode 100644
index 000000000..2414a96a7
--- /dev/null
+++ b/test/benchmarks/tools/meminfo.go
@@ -0,0 +1,60 @@
+// 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))
+	b.ReportMetric(val, "average_container_size_bytes")
+}
+
+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)
+}