Add __cxa_atexit benchmark
The benchmark calls __cxa_atexit 100000 times, then either exits early
without calling the destructors (_Exit) or exits normally, calling them
(exit).
Test: mmma bionic/benchmarks/spawn
Change-Id: I41fe702d6ef11acb7a1dec95bf546b5dc693bd4a
diff --git a/benchmarks/spawn/Android.bp b/benchmarks/spawn/Android.bp
index 2276d2e..689e7c9 100644
--- a/benchmarks/spawn/Android.bp
+++ b/benchmarks/spawn/Android.bp
@@ -68,6 +68,7 @@
// Install these binaries in the same directory as the main benchmark binary.
data: [
+ ":bench_cxa_atexit",
":bench_noop",
":bench_noop_nostl",
":bench_noop_static",
@@ -75,7 +76,7 @@
}
cc_defaults {
- name: "noop_binary_defaults",
+ name: "bionic_spawn_benchmark_binary",
defaults: ["bionic_spawn_benchmark_targets"],
compile_multilib: "both",
@@ -87,16 +88,11 @@
suffix: "64",
},
},
-}
-
-cc_binary {
- defaults: ["noop_binary_defaults"],
- name: "bench_noop",
- srcs: ["noop.cpp"],
// When this binary is installed to host/linux-x86/bin, its runpath is ${ORIGIN}/../lib64, which
// is fine for finding host/linux-x86/lib64/libc++.so. When it's installed to
- // host/linux-x86/benchmarktest64/bionic-spawn-benchmarks, the runpath needs an extra "..".
+ // host/linux-x86/benchmarktest64/bionic-spawn-benchmarks, the runpath needs an extra "..". This
+ // argument has no effect when a static executable is produced.
target: {
linux_glibc_x86_64: {
ldflags: [
@@ -107,14 +103,26 @@
}
cc_binary {
- defaults: ["noop_binary_defaults"],
+ defaults: ["bionic_spawn_benchmark_binary"],
+ name: "bench_cxa_atexit",
+ srcs: ["bench_cxa_atexit.cpp"],
+}
+
+cc_binary {
+ defaults: ["bionic_spawn_benchmark_binary"],
+ name: "bench_noop",
+ srcs: ["noop.cpp"],
+}
+
+cc_binary {
+ defaults: ["bionic_spawn_benchmark_binary"],
name: "bench_noop_nostl",
srcs: ["noop.cpp"],
stl: "none",
}
cc_binary {
- defaults: ["noop_binary_defaults"],
+ defaults: ["bionic_spawn_benchmark_binary"],
name: "bench_noop_static",
srcs: ["noop.cpp"],
static_executable: true,
diff --git a/benchmarks/spawn/bench_cxa_atexit.cpp b/benchmarks/spawn/bench_cxa_atexit.cpp
new file mode 100644
index 0000000..95849f4
--- /dev/null
+++ b/benchmarks/spawn/bench_cxa_atexit.cpp
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <string>
+
+extern "C" int __cxa_atexit(void (*func)(void*), void* arg, void* dso);
+
+extern void* __dso_handle;
+
+static void dtor_func(void*) {}
+
+// Prevent the compiler from optimizing out the __cxa_atexit call.
+void (*volatile g_pdtor_func)(void*) = dtor_func;
+
+int main(int argc, char* argv[]) {
+ auto usage = [&argv]() {
+ fprintf(stderr, "usage: %s COUNT MODE\n", argv[0]);
+ fprintf(stderr, "MODE is one of '_Exit' or 'exit'.\n");
+ exit(1);
+ };
+
+ if (argc != 3) usage();
+
+ int count = atoi(argv[1]);
+
+ // Two modes: "_Exit" ==> exit early w/o calling dtors, "exit" ==> call dtors on exit.
+ std::string mode = argv[2];
+ if (mode != "_Exit" && mode != "exit") usage();
+
+ for (int i = 0; i < count; ++i) {
+ __cxa_atexit(g_pdtor_func, nullptr, &__dso_handle);
+ }
+
+ if (mode == "_Exit") {
+ _Exit(0);
+ } else {
+ exit(0);
+ }
+}
diff --git a/benchmarks/spawn/spawn_benchmarks.cpp b/benchmarks/spawn/spawn_benchmarks.cpp
index 931a8be..18dacf9 100644
--- a/benchmarks/spawn/spawn_benchmarks.cpp
+++ b/benchmarks/spawn/spawn_benchmarks.cpp
@@ -31,6 +31,8 @@
SPAWN_BENCHMARK(noop, test_program("bench_noop").c_str());
SPAWN_BENCHMARK(noop_nostl, test_program("bench_noop_nostl").c_str());
SPAWN_BENCHMARK(noop_static, test_program("bench_noop_static").c_str());
+SPAWN_BENCHMARK(bench_cxa_atexit, test_program("bench_cxa_atexit").c_str(), "100000", "_Exit");
+SPAWN_BENCHMARK(bench_cxa_atexit_full, test_program("bench_cxa_atexit").c_str(), "100000", "exit");
// Android has a /bin -> /system/bin symlink, but use /system/bin explicitly so we can more easily
// compare Bionic-vs-glibc on a Linux desktop machine.