1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 // This measures the time required to compute two different native heap size metrics that 18 // we might use to guide GC triggering. 19 20 #include <atomic> 21 #include <err.h> 22 #include <fcntl.h> 23 #include <malloc.h> 24 #include <pthread.h> 25 #include <sched.h> 26 #include <unistd.h> 27 #include <sys/stat.h> 28 #include <sys/types.h> 29 30 #include <benchmark/benchmark.h> 31 #include "util.h" 32 33 static volatile size_t sink; 34 35 static constexpr int NTHREADS = 5; 36 37 static std::atomic<int> thread_count; 38 39 static void* thread_func(void* arg) { 40 *reinterpret_cast<void**>(arg) = malloc(17); 41 thread_count++; 42 return nullptr; 43 } 44 45 static void BM_mallinfo(benchmark::State& state) { 46 pthread_t t[NTHREADS]; 47 void* object[NTHREADS]; 48 // Create threads to populate thread-local arenas, if any. 49 thread_count = 0; 50 for (int i = 0; i < 5; i++) { 51 int res = pthread_create(t + i, NULL, thread_func, object + i); 52 if (res != 0) { 53 errx(1, "ERROR: pthread_create failed"); 54 } 55 } 56 while (thread_count != NTHREADS) { 57 sched_yield(); 58 } 59 for (auto _ : state) { 60 sink = mallinfo().uordblks; 61 } 62 for (int i = 0; i < 5; i++) { 63 int res = pthread_join(t[i], NULL); 64 if (res != 0) { 65 errx(1, "ERROR: pthread_join failed"); 66 } 67 free(object[i]); 68 } 69 } 70 71 BIONIC_BENCHMARK(BM_mallinfo); 72 73 static constexpr int BUF_SIZE = 100; 74 75 static void BM_read_statm(benchmark::State& state) { 76 char buf[BUF_SIZE]; 77 int statm_fd = open("/proc/self/statm", O_RDONLY); 78 if (statm_fd == -1) { 79 errx(1, "ERROR: Open failed"); 80 } 81 for (auto _ : state) { 82 off_t result = lseek(statm_fd, 0 /* offset */, SEEK_SET); 83 if (result == (off_t) -1) { 84 errx(1, "ERROR: lseek to beginning failed"); 85 } 86 ssize_t nread = read(statm_fd, buf, BUF_SIZE); 87 if (nread < 13 || nread > 50) { 88 errx(1, "ERROR: Implausible read result; result = %zd", nread); 89 } 90 // We should really add the parsing overhead for the result; but that should be < 100 nsecs 91 // if we tweak it enough. 92 } 93 if (close(statm_fd) == -1) { 94 errx(1, "ERROR: Close failed"); 95 } 96 } 97 98 BIONIC_BENCHMARK(BM_read_statm); 99
