upload android base code part3

android/bionic/benchmarks/stdio_benchmark.cpp

@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * 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 <stdio.h>
+#include <stdio_ext.h>
+#include <stdlib.h>
+
+#include <benchmark/benchmark.h>
+
+constexpr auto KB = 1024;
+
+#define AT_COMMON_SIZES \
+    Arg(1)->Arg(2)->Arg(3)->Arg(4)->Arg(8)->Arg(16)->Arg(32)->Arg(64)->Arg(512)-> \
+    Arg(1*KB)->Arg(4*KB)->Arg(8*KB)->Arg(16*KB)->Arg(64*KB)
+
+template <typename Fn>
+void ReadWriteTest(benchmark::State& state, Fn f, bool buffered) {
+  size_t chunk_size = state.range(0);
+
+  FILE* fp = fopen("/dev/zero", "rw");
+  __fsetlocking(fp, FSETLOCKING_BYCALLER);
+  char* buf = new char[chunk_size];
+
+  if (!buffered) {
+    setvbuf(fp, 0, _IONBF, 0);
+  }
+
+  while (state.KeepRunning()) {
+    f(buf, chunk_size, 1, fp);
+  }
+
+  state.SetBytesProcessed(int64_t(state.iterations()) * int64_t(chunk_size));
+  delete[] buf;
+  fclose(fp);
+}
+
+void BM_stdio_fread(benchmark::State& state) {
+  ReadWriteTest(state, fread, true);
+}
+BENCHMARK(BM_stdio_fread)->AT_COMMON_SIZES;
+
+void BM_stdio_fwrite(benchmark::State& state) {
+  ReadWriteTest(state, fwrite, true);
+}
+BENCHMARK(BM_stdio_fwrite)->AT_COMMON_SIZES;
+
+void BM_stdio_fread_unbuffered(benchmark::State& state) {
+  ReadWriteTest(state, fread, false);
+}
+BENCHMARK(BM_stdio_fread_unbuffered)->AT_COMMON_SIZES;
+
+void BM_stdio_fwrite_unbuffered(benchmark::State& state) {
+  ReadWriteTest(state, fwrite, false);
+}
+BENCHMARK(BM_stdio_fwrite_unbuffered)->AT_COMMON_SIZES;
+
+static void FopenFgetsFclose(benchmark::State& state, bool no_locking) {
+  char buf[1024];
+  while (state.KeepRunning()) {
+    FILE* fp = fopen("/proc/version", "re");
+    if (no_locking) __fsetlocking(fp, FSETLOCKING_BYCALLER);
+    if (fgets(buf, sizeof(buf), fp) == nullptr) abort();
+    fclose(fp);
+  }
+}
+
+static void BM_stdio_fopen_fgets_fclose_locking(benchmark::State& state) {
+  FopenFgetsFclose(state, false);
+}
+BENCHMARK(BM_stdio_fopen_fgets_fclose_locking);
+
+void BM_stdio_fopen_fgets_fclose_no_locking(benchmark::State& state) {
+  FopenFgetsFclose(state, true);
+}
+BENCHMARK(BM_stdio_fopen_fgets_fclose_no_locking);