1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <malloc.h>
30 #include <unistd.h>
31
32 #include <vector>
33
34 #include <benchmark/benchmark.h>
35 #include "util.h"
36
37 #if defined(__BIONIC__)
38
BM_mallopt_purge(benchmark::State & state)39 static void BM_mallopt_purge(benchmark::State& state) {
40 static size_t sizes[] = {8, 16, 32, 64, 128, 1024, 4096, 16384, 65536, 131072, 1048576};
41 static int pagesize = getpagesize();
42 mallopt(M_DECAY_TIME, 1);
43 mallopt(M_PURGE, 0);
44 for (auto _ : state) {
45 state.PauseTiming();
46 std::vector<void*> ptrs;
47 for (auto size : sizes) {
48 // Allocate at least two pages worth of the allocations.
49 for (size_t allocated = 0; allocated < 2 * static_cast<size_t>(pagesize); allocated += size) {
50 void* ptr = malloc(size);
51 if (ptr == nullptr) {
52 state.SkipWithError("Failed to allocate memory");
53 }
54 MakeAllocationResident(ptr, size, pagesize);
55 ptrs.push_back(ptr);
56 }
57 }
58 // Free the memory, which should leave many of the pages resident until
59 // the purge call.
60 for (auto ptr : ptrs) {
61 free(ptr);
62 }
63 ptrs.clear();
64 state.ResumeTiming();
65
66 mallopt(M_PURGE, 0);
67 }
68 mallopt(M_DECAY_TIME, 0);
69 }
70 BIONIC_BENCHMARK(BM_mallopt_purge);
71
72 #endif
73