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// Copyright 2021 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 <fcntl.h>
#include <stdlib.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <unistd.h>
#include "gtest/gtest.h"
#include "benchmark/benchmark.h"
#include "test/util/logging.h"
#include "test/util/temp_path.h"
#include "test/util/test_util.h"
#include "test/util/verity_util.h"
namespace gvisor {
namespace testing {
namespace {
// Create a 1GB file that will be read from at random positions. This should
// invalid any performance gains from caching.
const uint64_t kFileSize = Megabytes(1024);
// How many bytes to write at once to initialize the file used to read from.
const uint32_t kWriteSize = 65536;
// Largest benchmarked read unit.
const uint32_t kMaxRead = Megabytes(64);
// Global test state, initialized once per process lifetime.
struct GlobalState {
explicit GlobalState() {
// Mount a tmpfs file system to be wrapped by a verity fs.
tmp_dir_ = TempPath::CreateDir().ValueOrDie();
TEST_CHECK(mount("", tmp_dir_.path().c_str(), "tmpfs", 0, "") == 0);
file_ = TempPath::CreateFileIn(tmp_dir_.path()).ValueOrDie();
filename_ = std::string(Basename(file_.path()));
FileDescriptor fd = Open(file_.path(), O_WRONLY).ValueOrDie();
// Try to minimize syscalls by using maximum size writev() requests.
std::vector<char> buffer(kWriteSize);
RandomizeBuffer(buffer.data(), buffer.size());
const std::vector<std::vector<struct iovec>> iovecs_list =
GenerateIovecs(kFileSize + kMaxRead, buffer.data(), buffer.size());
for (const auto& iovecs : iovecs_list) {
TEST_CHECK(writev(fd.get(), iovecs.data(), iovecs.size()) >= 0);
}
verity_dir_ =
MountVerity(tmp_dir_.path(), {EnableTarget(filename_, O_RDONLY)})
.ValueOrDie();
}
TempPath tmp_dir_;
TempPath file_;
std::string verity_dir_;
std::string filename_;
};
GlobalState& GetGlobalState() {
// This gets created only once throughout the lifetime of the process.
// Use a dynamically allocated object (that is never deleted) to avoid order
// of destruction of static storage variables issues.
static GlobalState* const state =
// The actual file size is the maximum random seek range (kFileSize) + the
// maximum read size so we can read that number of bytes at the end of the
// file.
new GlobalState();
return *state;
}
void BM_VerityRandRead(benchmark::State& state) {
const int size = state.range(0);
GlobalState& global_state = GetGlobalState();
FileDescriptor verity_fd = ASSERT_NO_ERRNO_AND_VALUE(Open(
JoinPath(global_state.verity_dir_, global_state.filename_), O_RDONLY));
std::vector<char> buf(size);
unsigned int seed = 1;
for (auto _ : state) {
TEST_CHECK(PreadFd(verity_fd.get(), buf.data(), buf.size(),
rand_r(&seed) % kFileSize) == size);
}
state.SetBytesProcessed(static_cast<int64_t>(size) *
static_cast<int64_t>(state.iterations()));
}
BENCHMARK(BM_VerityRandRead)->Range(1, kMaxRead)->UseRealTime();
} // namespace
} // namespace testing
} // namespace gvisor
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