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
24 #if defined(__BIONIC__)
25
26 #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
27 #include <sys/_system_properties.h>
28
29 #include <benchmark/Benchmark.h>
30
31 extern void* __system_property_area__;
32
33 // Do not exceed 512, that is about the largest number of properties
34 // that can be created with the current property area size.
35 #define TEST_NUM_PROPS \
36 Arg(1)->Arg(4)->Arg(16)->Arg(64)->Arg(128)->Arg(256)->Arg(512)
37
38 struct LocalPropertyTestState {
LocalPropertyTestStateLocalPropertyTestState39 LocalPropertyTestState(int nprops) : nprops(nprops), valid(false) {
40 static const char prop_name_chars[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_.";
41
42 const char* android_data = getenv("ANDROID_DATA");
43 if (android_data == NULL) {
44 printf("ANDROID_DATA environment variable not set\n");
45 return;
46 }
47 char dir_template[PATH_MAX];
48 snprintf(dir_template, sizeof(dir_template), "%s/local/tmp/prop-XXXXXX", android_data);
49 char* dirname = mkdtemp(dir_template);
50 if (!dirname) {
51 printf("making temp file for test state failed (is %s/local/tmp writable?): %s\n",
52 android_data, strerror(errno));
53 return;
54 }
55
56 old_pa = __system_property_area__;
57 __system_property_area__ = NULL;
58
59 pa_dirname = dirname;
60 pa_filename = pa_dirname + "/__properties__";
61
62 __system_property_set_filename(pa_filename.c_str());
63 __system_property_area_init();
64
65 names = new char* [nprops];
66 name_lens = new int[nprops];
67 values = new char* [nprops];
68 value_lens = new int[nprops];
69
70 srandom(nprops);
71
72 for (int i = 0; i < nprops; i++) {
73 // Make sure the name has at least 10 characters to make
74 // it very unlikely to generate the same random name.
75 name_lens[i] = (random() % (PROP_NAME_MAX - 10)) + 10;
76 names[i] = new char[PROP_NAME_MAX + 1];
77 size_t prop_name_len = sizeof(prop_name_chars) - 1;
78 for (int j = 0; j < name_lens[i]; j++) {
79 if (j == 0 || names[i][j-1] == '.' || j == name_lens[i] - 1) {
80 // Certain values are not allowed:
81 // - Don't start name with '.'
82 // - Don't allow '.' to appear twice in a row
83 // - Don't allow the name to end with '.'
84 // This assumes that '.' is the last character in the
85 // array so that decrementing the length by one removes
86 // the value from the possible values.
87 prop_name_len--;
88 }
89 names[i][j] = prop_name_chars[random() % prop_name_len];
90 }
91 names[i][name_lens[i]] = 0;
92
93 // Make sure the value contains at least 1 character.
94 value_lens[i] = (random() % (PROP_VALUE_MAX - 1)) + 1;
95 values[i] = new char[PROP_VALUE_MAX];
96 for (int j = 0; j < value_lens[i]; j++) {
97 values[i][j] = prop_name_chars[random() % (sizeof(prop_name_chars) - 1)];
98 }
99
100 if (__system_property_add(names[i], name_lens[i], values[i], value_lens[i]) < 0) {
101 printf("Failed to add a property, terminating...\n");
102 printf("%s = %.*s\n", names[i], value_lens[i], values[i]);
103 exit(1);
104 }
105 }
106
107 valid = true;
108 }
109
~LocalPropertyTestStateLocalPropertyTestState110 ~LocalPropertyTestState() {
111 if (!valid)
112 return;
113
114 __system_property_area__ = old_pa;
115
116 __system_property_set_filename(PROP_FILENAME);
117 unlink(pa_filename.c_str());
118 rmdir(pa_dirname.c_str());
119
120 for (int i = 0; i < nprops; i++) {
121 delete names[i];
122 delete values[i];
123 }
124 delete[] names;
125 delete[] name_lens;
126 delete[] values;
127 delete[] value_lens;
128 }
129 public:
130 const int nprops;
131 char** names;
132 int* name_lens;
133 char** values;
134 int* value_lens;
135 bool valid;
136
137 private:
138 std::string pa_dirname;
139 std::string pa_filename;
140 void* old_pa;
141 };
142
143 BENCHMARK_WITH_ARG(BM_property_get, int)->TEST_NUM_PROPS;
Run(int iters,int nprops)144 void BM_property_get::Run(int iters, int nprops) {
145 StopBenchmarkTiming();
146
147 LocalPropertyTestState pa(nprops);
148 char value[PROP_VALUE_MAX];
149
150 if (!pa.valid)
151 return;
152
153 srandom(iters * nprops);
154
155 StartBenchmarkTiming();
156
157 for (int i = 0; i < iters; i++) {
158 __system_property_get(pa.names[random() % nprops], value);
159 }
160 StopBenchmarkTiming();
161 }
162
163 BENCHMARK_WITH_ARG(BM_property_find, int)->TEST_NUM_PROPS;
Run(int iters,int nprops)164 void BM_property_find::Run(int iters, int nprops) {
165 StopBenchmarkTiming();
166
167 LocalPropertyTestState pa(nprops);
168
169 if (!pa.valid)
170 return;
171
172 srandom(iters * nprops);
173
174 StartBenchmarkTiming();
175
176 for (int i = 0; i < iters; i++) {
177 __system_property_find(pa.names[random() % nprops]);
178 }
179 StopBenchmarkTiming();
180 }
181
182 BENCHMARK_WITH_ARG(BM_property_read, int)->TEST_NUM_PROPS;
Run(int iters,int nprops)183 void BM_property_read::Run(int iters, int nprops) {
184 StopBenchmarkTiming();
185
186 LocalPropertyTestState pa(nprops);
187
188 if (!pa.valid)
189 return;
190
191 srandom(iters * nprops);
192 const prop_info** pinfo = new const prop_info*[iters];
193 char propvalue[PROP_VALUE_MAX];
194
195 for (int i = 0; i < iters; i++) {
196 pinfo[i] = __system_property_find(pa.names[random() % nprops]);
197 }
198
199 StartBenchmarkTiming();
200 for (int i = 0; i < iters; i++) {
201 __system_property_read(pinfo[i], 0, propvalue);
202 }
203 StopBenchmarkTiming();
204
205 delete[] pinfo;
206 }
207
208 BENCHMARK_WITH_ARG(BM_property_serial, int)->TEST_NUM_PROPS;
Run(int iters,int nprops)209 void BM_property_serial::Run(int iters, int nprops) {
210 StopBenchmarkTiming();
211
212 LocalPropertyTestState pa(nprops);
213
214 if (!pa.valid)
215 return;
216
217 srandom(iters * nprops);
218 const prop_info** pinfo = new const prop_info*[iters];
219
220 for (int i = 0; i < iters; i++) {
221 pinfo[i] = __system_property_find(pa.names[random() % nprops]);
222 }
223
224 StartBenchmarkTiming();
225 for (int i = 0; i < iters; i++) {
226 __system_property_serial(pinfo[i]);
227 }
228 StopBenchmarkTiming();
229
230 delete[] pinfo;
231 }
232
233 #endif // __BIONIC__
234