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75 lines
2.4 KiB
75 lines
2.4 KiB
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "MediaUtils"
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#define LOG_NDEBUG 0
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#include <utils/Log.h>
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#include <cutils/properties.h>
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#include <sys/resource.h>
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#include <unistd.h>
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#include <bionic/malloc.h>
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#include <mediautils/LimitProcessMemory.h>
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extern "C" void __scudo_set_rss_limit(size_t, int) __attribute__((weak));
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namespace android {
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void limitProcessMemory(const char *property, size_t numberOfBytes,
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size_t percentageOfTotalMem) {
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long pageSize = sysconf(_SC_PAGESIZE);
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long numPages = sysconf(_SC_PHYS_PAGES);
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size_t maxMem = SIZE_MAX;
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if (pageSize > 0 && numPages > 0) {
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if (size_t(numPages) < SIZE_MAX / size_t(pageSize)) {
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maxMem = size_t(numPages) * size_t(pageSize);
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}
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ALOGV("physMem: %zu", maxMem);
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if (percentageOfTotalMem > 100) {
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ALOGW("requested %zu%% of total memory, using 100%%", percentageOfTotalMem);
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percentageOfTotalMem = 100;
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}
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maxMem = maxMem / 100 * percentageOfTotalMem;
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if (numberOfBytes < maxMem) {
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maxMem = numberOfBytes;
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}
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ALOGV("requested limit: %zu", maxMem);
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} else {
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ALOGW("couldn't determine total RAM");
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}
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int64_t propVal = property_get_int64(property, maxMem);
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if (propVal > 0 && uint64_t(propVal) <= SIZE_MAX) {
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maxMem = propVal;
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}
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// If Scudo is in use, enforce the hard RSS limit (in MB).
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if (maxMem != SIZE_MAX && &__scudo_set_rss_limit != 0) {
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__scudo_set_rss_limit(maxMem >> 20, 1);
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ALOGV("Scudo hard RSS limit set to %zu MB", maxMem >> 20);
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return;
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}
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if (!android_mallopt(M_SET_ALLOCATION_LIMIT_BYTES, &maxMem,
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sizeof(maxMem))) {
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ALOGW("couldn't set allocation limit");
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}
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}
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} // namespace android
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