fuse: add benchmarking support for FUSE

This change adds the following:
-  Add support for containerizing syscall tests for FUSE
-  Mount tmpfs in the container so we can run benchmarks against it
-  Run the server in a background process
-  benchmarks for fuse syscall

Co-authored-by: Ridwan Sharif <ridwanmsharif@google.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/test/fuse/benchmark/symlink_benchmark.cc b/test/fuse/benchmark/symlink_benchmark.cc
new file mode 100644
index 000000000..363b9a976
--- /dev/null
+++ b/test/fuse/benchmark/symlink_benchmark.cc
@@ -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.
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "absl/strings/str_cat.h"
+#include "benchmark/benchmark.h"
+#include "gtest/gtest.h"
+#include "test/util/fs_util.h"
+#include "test/util/temp_path.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+void BM_Symlink(benchmark::State& state) {
+  char* fuse_prefix = getenv("TEST_FUSEPRE");
+  ASSERT_NE(fuse_prefix, nullptr);
+  const TempPath top_dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir());
+  std::string dir_path = top_dir.path();
+
+  const int size = state.range(0);
+  std::vector<TempPath> cache;
+  for (int i = 0; i < size; i++) {
+    auto path = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
+    cache.emplace_back(std::move(path));
+  }
+
+  int index = 0;
+  unsigned int seed = 1;
+  for (auto t : state) {
+    const int chosen = rand_r(&seed) % size;
+    const std::string symlink_path = absl::StrCat(fuse_prefix, dir_path, index);
+    ASSERT_THAT(symlink(cache[chosen].path().c_str(), symlink_path.c_str()),
+                SyscallSucceeds());
+    index++;
+  }
+}
+
+BENCHMARK(BM_Symlink)->Range(1, 128)->UseRealTime();
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor