201 lines
5.9 KiB
Go
201 lines
5.9 KiB
Go
// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// These benchmarks emulate memfs benchmarks. Ext4 images must be created
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// before this benchmark is run using the `make_deep_ext4.sh` script at
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// /tmp/image-{depth}.ext4 for all the depths tested below.
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package benchmark_test
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import (
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"fmt"
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"os"
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"runtime"
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"strings"
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"testing"
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"gvisor.dev/gvisor/pkg/fspath"
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"gvisor.dev/gvisor/pkg/sentry/context"
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"gvisor.dev/gvisor/pkg/sentry/context/contexttest"
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"gvisor.dev/gvisor/pkg/sentry/fsimpl/ext"
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"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
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"gvisor.dev/gvisor/pkg/sentry/vfs"
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)
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var depths = []int{1, 2, 3, 8, 64, 100}
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const filename = "file.txt"
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// setUp opens imagePath as an ext Filesystem and returns all necessary
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// elements required to run tests. If error is nil, it also returns a tear
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// down function which must be called after the test is run for clean up.
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func setUp(b *testing.B, imagePath string) (context.Context, *vfs.VirtualFilesystem, *vfs.VirtualDentry, func(), error) {
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f, err := os.Open(imagePath)
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if err != nil {
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return nil, nil, nil, nil, err
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}
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ctx := contexttest.Context(b)
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creds := auth.CredentialsFromContext(ctx)
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// Create VFS.
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vfsObj := vfs.New()
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vfsObj.MustRegisterFilesystemType("extfs", ext.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
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AllowUserMount: true,
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})
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mntns, err := vfsObj.NewMountNamespace(ctx, creds, imagePath, "extfs", &vfs.GetFilesystemOptions{InternalData: int(f.Fd())})
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if err != nil {
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f.Close()
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return nil, nil, nil, nil, err
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}
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root := mntns.Root()
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tearDown := func() {
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root.DecRef()
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if err := f.Close(); err != nil {
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b.Fatalf("tearDown failed: %v", err)
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}
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}
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return ctx, vfsObj, &root, tearDown, nil
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}
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// mount mounts extfs at the path operation passed. Returns a tear down
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// function which must be called after the test is run for clean up.
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func mount(b *testing.B, imagePath string, vfsfs *vfs.VirtualFilesystem, pop *vfs.PathOperation) func() {
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b.Helper()
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f, err := os.Open(imagePath)
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if err != nil {
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b.Fatalf("could not open image at %s: %v", imagePath, err)
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}
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ctx := contexttest.Context(b)
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creds := auth.CredentialsFromContext(ctx)
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if err := vfsfs.MountAt(ctx, creds, imagePath, pop, "extfs", &vfs.MountOptions{
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GetFilesystemOptions: vfs.GetFilesystemOptions{
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InternalData: int(f.Fd()),
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},
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}); err != nil {
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b.Fatalf("failed to mount tmpfs submount: %v", err)
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}
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return func() {
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if err := f.Close(); err != nil {
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b.Fatalf("tearDown failed: %v", err)
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}
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}
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}
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// BenchmarkVFS2Ext4fsStat emulates BenchmarkVFS2MemfsStat.
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func BenchmarkVFS2Ext4fsStat(b *testing.B) {
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for _, depth := range depths {
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b.Run(fmt.Sprintf("%d", depth), func(b *testing.B) {
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ctx, vfsfs, root, tearDown, err := setUp(b, fmt.Sprintf("/tmp/image-%d.ext4", depth))
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if err != nil {
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b.Fatalf("setUp failed: %v", err)
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}
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defer tearDown()
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creds := auth.CredentialsFromContext(ctx)
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var filePathBuilder strings.Builder
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filePathBuilder.WriteByte('/')
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for i := 1; i <= depth; i++ {
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filePathBuilder.WriteString(fmt.Sprintf("%d", i))
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filePathBuilder.WriteByte('/')
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}
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filePathBuilder.WriteString(filename)
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filePath := filePathBuilder.String()
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runtime.GC()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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stat, err := vfsfs.StatAt(ctx, creds, &vfs.PathOperation{
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Root: *root,
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Start: *root,
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Path: fspath.Parse(filePath),
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FollowFinalSymlink: true,
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}, &vfs.StatOptions{})
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if err != nil {
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b.Fatalf("stat(%q) failed: %v", filePath, err)
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}
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// Sanity check.
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if stat.Size > 0 {
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b.Fatalf("got wrong file size (%d)", stat.Size)
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}
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}
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})
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}
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}
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// BenchmarkVFS2ExtfsMountStat emulates BenchmarkVFS2MemfsMountStat.
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func BenchmarkVFS2ExtfsMountStat(b *testing.B) {
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for _, depth := range depths {
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b.Run(fmt.Sprintf("%d", depth), func(b *testing.B) {
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// Create root extfs with depth 1 so we can mount extfs again at /1/.
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ctx, vfsfs, root, tearDown, err := setUp(b, fmt.Sprintf("/tmp/image-%d.ext4", 1))
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if err != nil {
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b.Fatalf("setUp failed: %v", err)
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}
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defer tearDown()
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creds := auth.CredentialsFromContext(ctx)
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mountPointName := "/1/"
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pop := vfs.PathOperation{
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Root: *root,
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Start: *root,
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Path: fspath.Parse(mountPointName),
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}
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// Save the mount point for later use.
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mountPoint, err := vfsfs.GetDentryAt(ctx, creds, &pop, &vfs.GetDentryOptions{})
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if err != nil {
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b.Fatalf("failed to walk to mount point: %v", err)
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}
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defer mountPoint.DecRef()
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// Create extfs submount.
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mountTearDown := mount(b, fmt.Sprintf("/tmp/image-%d.ext4", depth), vfsfs, &pop)
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defer mountTearDown()
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var filePathBuilder strings.Builder
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filePathBuilder.WriteString(mountPointName)
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for i := 1; i <= depth; i++ {
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filePathBuilder.WriteString(fmt.Sprintf("%d", i))
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filePathBuilder.WriteByte('/')
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}
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filePathBuilder.WriteString(filename)
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filePath := filePathBuilder.String()
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runtime.GC()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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stat, err := vfsfs.StatAt(ctx, creds, &vfs.PathOperation{
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Root: *root,
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Start: *root,
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Path: fspath.Parse(filePath),
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FollowFinalSymlink: true,
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}, &vfs.StatOptions{})
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if err != nil {
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b.Fatalf("stat(%q) failed: %v", filePath, err)
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}
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// Sanity check. touch(1) always creates files of size 0 (empty).
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if stat.Size > 0 {
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b.Fatalf("got wrong file size (%d)", stat.Size)
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}
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}
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})
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}
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}
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