rename to syscall

CMakeLists.txt

@@ -57,4 +57,4 @@ add_subdirectory(src/mutex)
 add_subdirectory(src/random)
 add_subdirectory(src/timer)
 add_subdirectory(src/ub)
-add_subdirectory(src/vsdo)
+add_subdirectory(src/syscall)

src/vsdo/CMakeLists.txt → src/syscall/CMakeLists.txt

@@ -1,3 +1,4 @@
 add_executable(vdso vdso.cpp)
+add_executable(epoll epoll.cpp)
 #target_link_options(vdso PRIVATE -static -Wl,-Bdynamic)
 #target_compile_options(vdso PRIVATE -static)

src/syscall/epoll.cpp

@@ -0,0 +1,45 @@
+// Copyright 2023 The Division 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
+//
+//      https://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.
+// Author dietoad@gmail.com && firedtoad@gmail.com
+
+#include <benchmark/benchmark.h>
+#include <fcntl.h>
+#include <sys/epoll.h>
+#include <unistd.h>
+
+template <size_t wait> static void BenchEpollWait(benchmark::State &state)
+{
+    int efd = epoll_create1(EPOLL_CLOEXEC);
+    epoll_event events[1024];
+    int fd = open("/proc/stat", 0);
+    epoll_event evt;
+    evt.events = EPOLLIN;
+    epoll_ctl(efd, EPOLL_CTL_ADD, fd, &evt);
+    for (auto _ : state)
+    {
+        int r = epoll_wait(efd, events, 1024, wait);
+        benchmark::DoNotOptimize(r);
+    }
+    close(fd);
+    close(efd);
+}
+BENCHMARK_TEMPLATE(BenchEpollWait, 1);
+BENCHMARK_TEMPLATE(BenchEpollWait, 0);
+
+int main(int argc, char **argv)
+{
+    benchmark::Initialize(&argc, argv);
+    benchmark::RunSpecifiedBenchmarks();
+    return 0;
+}