100 lines
2.8 KiB
C++
100 lines
2.8 KiB
C++
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// Copyright 2020 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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#include <sys/epoll.h>
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#include <sys/eventfd.h>
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#include <atomic>
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#include <cerrno>
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#include <cstdint>
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#include <cstdlib>
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#include <ctime>
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#include <memory>
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#include "gtest/gtest.h"
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#include "absl/time/time.h"
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#include "benchmark/benchmark.h"
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#include "test/util/epoll_util.h"
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#include "test/util/file_descriptor.h"
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#include "test/util/test_util.h"
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#include "test/util/thread_util.h"
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namespace gvisor {
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namespace testing {
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namespace {
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// Returns a new eventfd.
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PosixErrorOr<FileDescriptor> NewEventFD() {
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int fd = eventfd(0, /* flags = */ 0);
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MaybeSave();
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if (fd < 0) {
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return PosixError(errno, "eventfd");
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}
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return FileDescriptor(fd);
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}
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// Also stolen from epoll.cc unit tests.
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void BM_EpollTimeout(benchmark::State& state) {
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constexpr int kFDsPerEpoll = 3;
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auto epollfd = ASSERT_NO_ERRNO_AND_VALUE(NewEpollFD());
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std::vector<FileDescriptor> eventfds;
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for (int i = 0; i < kFDsPerEpoll; i++) {
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eventfds.push_back(ASSERT_NO_ERRNO_AND_VALUE(NewEventFD()));
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ASSERT_NO_ERRNO(
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RegisterEpollFD(epollfd.get(), eventfds[i].get(), EPOLLIN, 0));
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}
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struct epoll_event result[kFDsPerEpoll];
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int timeout_ms = state.range(0);
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for (auto _ : state) {
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EXPECT_EQ(0, epoll_wait(epollfd.get(), result, kFDsPerEpoll, timeout_ms));
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}
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}
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BENCHMARK(BM_EpollTimeout)->Range(0, 8);
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// Also stolen from epoll.cc unit tests.
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void BM_EpollAllEvents(benchmark::State& state) {
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auto epollfd = ASSERT_NO_ERRNO_AND_VALUE(NewEpollFD());
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const int fds_per_epoll = state.range(0);
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constexpr uint64_t kEventVal = 5;
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std::vector<FileDescriptor> eventfds;
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for (int i = 0; i < fds_per_epoll; i++) {
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eventfds.push_back(ASSERT_NO_ERRNO_AND_VALUE(NewEventFD()));
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ASSERT_NO_ERRNO(
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RegisterEpollFD(epollfd.get(), eventfds[i].get(), EPOLLIN, 0));
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ASSERT_THAT(WriteFd(eventfds[i].get(), &kEventVal, sizeof(kEventVal)),
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SyscallSucceedsWithValue(sizeof(kEventVal)));
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}
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std::vector<struct epoll_event> result(fds_per_epoll);
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for (auto _ : state) {
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EXPECT_EQ(fds_per_epoll,
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epoll_wait(epollfd.get(), result.data(), fds_per_epoll, 0));
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}
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}
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BENCHMARK(BM_EpollAllEvents)->Range(2, 1024);
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} // namespace
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} // namespace testing
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} // namespace gvisor
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