1 /*
2  * Copyright (C) 2012 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 #include <errno.h>
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <unistd.h>
21 
22 #include <string>
23 #include <vector>
24 
25 #include <android-base/file.h>
26 
27 using namespace std::literals;
28 
29 #if defined(__BIONIC__)
30 
31 #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
32 #include <sys/_system_properties.h>
33 
34 #include <benchmark/benchmark.h>
35 #include <system_properties/system_properties.h>
36 #include "util.h"
37 
38 struct LocalPropertyTestState {
LocalPropertyTestStateLocalPropertyTestState39   explicit LocalPropertyTestState(int nprops)
40       : nprops(nprops), valid(false), system_properties_(false) {
41     static const char prop_name_chars[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_.";
42 
43     valid = system_properties_.AreaInit(dir_.path, nullptr, true);
44     if (!valid) {
45       printf("Failed to initialize properties, terminating...\n");
46       exit(1);
47     }
48 
49     names = new char* [nprops];
50     name_lens = new int[nprops];
51     values = new char* [nprops];
52     value_lens = new int[nprops];
53 
54     srandom(nprops);
55 
56     for (int i = 0; i < nprops; i++) {
57       // Make sure the name has at least 10 characters to make
58       // it very unlikely to generate the same random name.
59       name_lens[i] = (random() % (PROP_NAME_MAX - 10)) + 10;
60       names[i] = new char[PROP_NAME_MAX + 1];
61       size_t prop_name_len = sizeof(prop_name_chars) - 1;
62       for (int j = 0; j < name_lens[i]; j++) {
63         if (j == 0 || names[i][j-1] == '.' || j == name_lens[i] - 1) {
64           // Certain values are not allowed:
65           // - Don't start name with '.'
66           // - Don't allow '.' to appear twice in a row
67           // - Don't allow the name to end with '.'
68           // This assumes that '.' is the last character in the
69           // array so that decrementing the length by one removes
70           // the value from the possible values.
71           prop_name_len--;
72         }
73         names[i][j] = prop_name_chars[random() % prop_name_len];
74       }
75       names[i][name_lens[i]] = 0;
76 
77       // Make sure the value contains at least 1 character.
78       value_lens[i] = (random() % (PROP_VALUE_MAX - 1)) + 1;
79       values[i] = new char[PROP_VALUE_MAX];
80       for (int j = 0; j < value_lens[i]; j++) {
81         values[i][j] = prop_name_chars[random() % (sizeof(prop_name_chars) - 1)];
82       }
83 
84       if (system_properties_.Add(names[i], name_lens[i], values[i], value_lens[i]) < 0) {
85         printf("Failed to add a property, terminating...\n");
86         printf("%s = %.*s\n", names[i], value_lens[i], values[i]);
87         exit(1);
88       }
89     }
90 
91     valid = true;
92   }
93 
system_propertiesLocalPropertyTestState94   SystemProperties& system_properties() {
95     return system_properties_;
96   }
97 
~LocalPropertyTestStateLocalPropertyTestState98   ~LocalPropertyTestState() {
99     if (!valid) {
100       return;
101     }
102 
103     system_properties_.contexts_->FreeAndUnmap();
104     if (system_properties_.appcompat_override_contexts_) {
105       system_properties_.appcompat_override_contexts_->FreeAndUnmap();
106     }
107 
108     for (int i = 0; i < nprops; i++) {
109       delete names[i];
110       delete values[i];
111     }
112     delete[] names;
113     delete[] name_lens;
114     delete[] values;
115     delete[] value_lens;
116   }
117 
118  public:
119   const int nprops;
120   char** names;
121   int* name_lens;
122   char** values;
123   int* value_lens;
124   bool valid;
125 
126  private:
127   SystemProperties system_properties_;
128   TemporaryDir dir_;
129 };
130 
BM_property_get(benchmark::State & state)131 static void BM_property_get(benchmark::State& state) {
132   const size_t nprops = state.range(0);
133 
134   LocalPropertyTestState pa(nprops);
135   if (!pa.valid) return;
136 
137   while (state.KeepRunning()) {
138     char value[PROP_VALUE_MAX];
139     pa.system_properties().Get(pa.names[random() % nprops], value);
140   }
141 }
142 BIONIC_BENCHMARK_WITH_ARG(BM_property_get, "NUM_PROPS");
143 
BM_property_find(benchmark::State & state)144 static void BM_property_find(benchmark::State& state) {
145   const size_t nprops = state.range(0);
146 
147   LocalPropertyTestState pa(nprops);
148   if (!pa.valid) return;
149 
150   while (state.KeepRunning()) {
151     pa.system_properties().Find(pa.names[random() % nprops]);
152   }
153 }
154 BIONIC_BENCHMARK_WITH_ARG(BM_property_find, "NUM_PROPS");
155 
BM_property_read(benchmark::State & state)156 static void BM_property_read(benchmark::State& state) {
157   const size_t nprops = state.range(0);
158 
159   LocalPropertyTestState pa(nprops);
160   if (!pa.valid) return;
161 
162   const prop_info** pinfo = new const prop_info*[nprops];
163   char propvalue[PROP_VALUE_MAX];
164 
165   for (size_t i = 0; i < nprops; ++i) {
166     pinfo[i] = pa.system_properties().Find(pa.names[random() % nprops]);
167   }
168 
169   size_t i = 0;
170   while (state.KeepRunning()) {
171     pa.system_properties().Read(pinfo[i], nullptr, propvalue);
172     i = (i + 1) % nprops;
173   }
174 
175   delete[] pinfo;
176 }
177 BIONIC_BENCHMARK_WITH_ARG(BM_property_read, "NUM_PROPS");
178 
BM_property_serial(benchmark::State & state)179 static void BM_property_serial(benchmark::State& state) {
180   const size_t nprops = state.range(0);
181 
182   LocalPropertyTestState pa(nprops);
183   if (!pa.valid) return;
184 
185   const prop_info** pinfo = new const prop_info*[nprops];
186   for (size_t i = 0; i < nprops; ++i) {
187     pinfo[i] = pa.system_properties().Find(pa.names[random() % nprops]);
188   }
189 
190   size_t i = 0;
191   while (state.KeepRunning()) {
192     __system_property_serial(pinfo[i]);
193     i = (i + 1) % nprops;
194   }
195 
196   delete[] pinfo;
197 }
198 BIONIC_BENCHMARK_WITH_ARG(BM_property_serial, "NUM_PROPS");
199 
200 // This benchmarks find the actual properties currently set on the system and accessible by the
201 // user that runs this benchmark (aka this is best run as root).  It is not comparable between
202 // devices, nor even boots, but is useful to understand the the real end-to-end speed, including
203 // costs to find the correct property file within /dev/__properties__.
BM_property_find_real(benchmark::State & state)204 static void BM_property_find_real(benchmark::State& state) {
205   std::vector<std::string> properties;
206   __system_property_foreach(
207       [](const prop_info* pi, void* cookie) {
208         __system_property_read_callback(pi,
209                                         [](void* cookie, const char* name, const char*, unsigned) {
210                                           auto properties =
211                                               reinterpret_cast<std::vector<std::string>*>(cookie);
212                                           properties->emplace_back(name);
213                                         },
214                                         cookie);
215       },
216       &properties);
217 
218   while (state.KeepRunning()) {
219     for (const auto& property : properties) {
220       __system_property_find(property.c_str());
221     }
222   }
223 }
224 BIONIC_BENCHMARK(BM_property_find_real);
225 
226 #endif  // __BIONIC__
227