1 /*
2 * Copyright (C) 2016 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 #define LOG_TAG "MediaUtils"
18 #define LOG_NDEBUG 0
19 #include <utils/Log.h>
20
21 #include <cutils/properties.h>
22 #include <sys/resource.h>
23 #include <unistd.h>
24
25 #include "MediaUtils.h"
26
27 namespace android {
28
limitProcessMemory(const char * property,size_t numberOfBytes,size_t percentageOfTotalMem)29 void limitProcessMemory(
30 const char *property,
31 size_t numberOfBytes,
32 size_t percentageOfTotalMem) {
33
34 long pageSize = sysconf(_SC_PAGESIZE);
35 long numPages = sysconf(_SC_PHYS_PAGES);
36 size_t maxMem = SIZE_MAX;
37
38 if (pageSize > 0 && numPages > 0) {
39 if (size_t(numPages) < SIZE_MAX / size_t(pageSize)) {
40 maxMem = size_t(numPages) * size_t(pageSize);
41 }
42 ALOGV("physMem: %zu", maxMem);
43 if (percentageOfTotalMem > 100) {
44 ALOGW("requested %zu%% of total memory, using 100%%", percentageOfTotalMem);
45 percentageOfTotalMem = 100;
46 }
47 maxMem = maxMem / 100 * percentageOfTotalMem;
48 if (numberOfBytes < maxMem) {
49 maxMem = numberOfBytes;
50 }
51 ALOGV("requested limit: %zu", maxMem);
52 } else {
53 ALOGW("couldn't determine total RAM");
54 }
55
56 int64_t propVal = property_get_int64(property, maxMem);
57 if (propVal > 0 && uint64_t(propVal) <= SIZE_MAX) {
58 maxMem = propVal;
59 }
60 ALOGV("actual limit: %zu", maxMem);
61
62 struct rlimit limit;
63 getrlimit(RLIMIT_AS, &limit);
64 ALOGV("original limits: %lld/%lld", (long long)limit.rlim_cur, (long long)limit.rlim_max);
65 limit.rlim_cur = maxMem;
66 setrlimit(RLIMIT_AS, &limit);
67 limit.rlim_cur = -1;
68 limit.rlim_max = -1;
69 getrlimit(RLIMIT_AS, &limit);
70 ALOGV("new limits: %lld/%lld", (long long)limit.rlim_cur, (long long)limit.rlim_max);
71
72 }
73
74 } // namespace android
75