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