libprocinfo: add functions reading process map file.
Add test and benchmark.
Also switch libbacktrace, libunwindstack, libmemunreachable
to use libprocinfo for map file reading.
The benchmark shows using libprocinfo speeds up map file reading
in libbacktrace and libunwindstack 18% - 36% on walleye.
Bug: http://b/79118393
Test: run procinfo_test.
Test: run libunwindstack_test.
Test: run libbacktrace_test.
Test: run memunreachable_test.
Change-Id: Icf281c352f4103fc8d4ba6732c5c07b943330ca1
diff --git a/process_map_benchmark.cpp b/process_map_benchmark.cpp
new file mode 100644
index 0000000..d9e8a4d
--- /dev/null
+++ b/process_map_benchmark.cpp
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2018 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 <procinfo/process_map.h>
+
+#include <string.h>
+
+#include <string>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <backtrace/BacktraceMap.h>
+#include <unwindstack/Maps.h>
+
+#include <benchmark/benchmark.h>
+
+struct MapInfo {
+ uint64_t start;
+ uint64_t end;
+ uint16_t flags;
+ uint64_t pgoff;
+ const std::string name;
+
+ MapInfo(uint64_t start, uint64_t end, uint16_t flags, uint64_t pgoff, const char* name)
+ : start(start), end(end), flags(flags), pgoff(pgoff), name(name) {}
+};
+
+static void BM_ReadMapFile(benchmark::State& state) {
+ std::string map_file = android::base::GetExecutableDirectory() + "/testdata/maps";
+ for (auto _ : state) {
+ std::vector<MapInfo> maps;
+ android::procinfo::ReadMapFile(
+ map_file, [&](uint64_t start, uint64_t end, uint16_t flags, uint64_t pgoff,
+ const char* name) { maps.emplace_back(start, end, flags, pgoff, name); });
+ CHECK_EQ(maps.size(), 2043u);
+ }
+}
+BENCHMARK(BM_ReadMapFile);
+
+static void BM_unwindstack_FileMaps(benchmark::State& state) {
+ std::string map_file = android::base::GetExecutableDirectory() + "/testdata/maps";
+ for (auto _ : state) {
+ unwindstack::FileMaps maps(map_file);
+ maps.Parse();
+ CHECK_EQ(maps.Total(), 2043u);
+ }
+}
+BENCHMARK(BM_unwindstack_FileMaps);
+
+static void BM_unwindstack_BufferMaps(benchmark::State& state) {
+ std::string map_file = android::base::GetExecutableDirectory() + "/testdata/maps";
+ std::string content;
+ CHECK(android::base::ReadFileToString(map_file, &content));
+ for (auto _ : state) {
+ unwindstack::BufferMaps maps(content.c_str());
+ maps.Parse();
+ CHECK_EQ(maps.Total(), 2043u);
+ }
+}
+BENCHMARK(BM_unwindstack_BufferMaps);
+
+static void BM_backtrace_BacktraceMap(benchmark::State& state) {
+ pid_t pid = getpid();
+ for (auto _ : state) {
+ BacktraceMap* map = BacktraceMap::Create(pid, true);
+ CHECK(map != nullptr);
+ delete map;
+ }
+}
+BENCHMARK(BM_backtrace_BacktraceMap);
+
+BENCHMARK_MAIN();