| /* |
| * 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. |
| */ |
| |
| // This measures the time required to compute two different native heap size metrics that |
| // we might use to guide GC triggering. |
| |
| #include <atomic> |
| #include <err.h> |
| #include <fcntl.h> |
| #include <malloc.h> |
| #include <pthread.h> |
| #include <sched.h> |
| #include <unistd.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| |
| #include <benchmark/benchmark.h> |
| #include "util.h" |
| |
| static constexpr int NTHREADS = 5; |
| |
| static std::atomic<int> thread_count; |
| |
| static void* thread_func(void* arg) { |
| *reinterpret_cast<void**>(arg) = malloc(17); |
| thread_count++; |
| return nullptr; |
| } |
| |
| static void BM_mallinfo(benchmark::State& state) { |
| pthread_t t[NTHREADS]; |
| void* object[NTHREADS]; |
| // Create threads to populate thread-local arenas, if any. |
| thread_count = 0; |
| for (int i = 0; i < 5; i++) { |
| int res = pthread_create(t + i, NULL, thread_func, object + i); |
| if (res != 0) { |
| errx(1, "ERROR: pthread_create failed"); |
| } |
| } |
| while (thread_count != NTHREADS) { |
| sched_yield(); |
| } |
| for (auto _ : state) { |
| benchmark::DoNotOptimize(mallinfo().uordblks); |
| } |
| for (int i = 0; i < 5; i++) { |
| int res = pthread_join(t[i], NULL); |
| if (res != 0) { |
| errx(1, "ERROR: pthread_join failed"); |
| } |
| free(object[i]); |
| } |
| } |
| |
| BIONIC_BENCHMARK(BM_mallinfo); |
| |
| static constexpr int BUF_SIZE = 100; |
| |
| static void BM_read_statm(benchmark::State& state) { |
| char buf[BUF_SIZE]; |
| int statm_fd = open("/proc/self/statm", O_RDONLY); |
| if (statm_fd == -1) { |
| errx(1, "ERROR: Open failed"); |
| } |
| for (auto _ : state) { |
| off_t result = lseek(statm_fd, 0 /* offset */, SEEK_SET); |
| if (result == (off_t) -1) { |
| errx(1, "ERROR: lseek to beginning failed"); |
| } |
| ssize_t nread = read(statm_fd, buf, BUF_SIZE); |
| if (nread < 13 || nread > 50) { |
| errx(1, "ERROR: Implausible read result; result = %zd", nread); |
| } |
| // We should really add the parsing overhead for the result; but that should be < 100 nsecs |
| // if we tweak it enough. |
| } |
| if (close(statm_fd) == -1) { |
| errx(1, "ERROR: Close failed"); |
| } |
| } |
| |
| BIONIC_BENCHMARK(BM_read_statm); |