blob: bcdc3bdcfea82bcf6b3e448dce178057981128f1 [file] [log] [blame]
/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "MediaUtils"
#define LOG_NDEBUG 0
#include <utils/Log.h>
#include <cutils/properties.h>
#include <sys/resource.h>
#include <unistd.h>
#include "MediaUtils.h"
extern "C" size_t __cfi_shadow_size();
namespace android {
void limitProcessMemory(
const char *property,
size_t numberOfBytes,
size_t percentageOfTotalMem) {
if (running_with_asan()) {
ALOGW("Running with ASan, skip enforcing memory limitations.");
return;
}
long pageSize = sysconf(_SC_PAGESIZE);
long numPages = sysconf(_SC_PHYS_PAGES);
size_t maxMem = SIZE_MAX;
if (pageSize > 0 && numPages > 0) {
if (size_t(numPages) < SIZE_MAX / size_t(pageSize)) {
maxMem = size_t(numPages) * size_t(pageSize);
}
ALOGV("physMem: %zu", maxMem);
if (percentageOfTotalMem > 100) {
ALOGW("requested %zu%% of total memory, using 100%%", percentageOfTotalMem);
percentageOfTotalMem = 100;
}
maxMem = maxMem / 100 * percentageOfTotalMem;
if (numberOfBytes < maxMem) {
maxMem = numberOfBytes;
}
ALOGV("requested limit: %zu", maxMem);
} else {
ALOGW("couldn't determine total RAM");
}
int64_t propVal = property_get_int64(property, maxMem);
if (propVal > 0 && uint64_t(propVal) <= SIZE_MAX) {
maxMem = propVal;
}
// Increase by the size of the CFI shadow mapping. Most of the shadow is not
// backed with physical pages, and it is possible for the result to be
// higher than total physical memory. This is fine for RLIMIT_AS.
size_t cfi_size = __cfi_shadow_size();
if (cfi_size) {
ALOGV("cfi shadow size: %zu", cfi_size);
if (maxMem <= SIZE_MAX - cfi_size) {
maxMem += cfi_size;
} else {
maxMem = SIZE_MAX;
}
}
ALOGV("actual limit: %zu", maxMem);
struct rlimit limit;
getrlimit(RLIMIT_AS, &limit);
ALOGV("original limits: %lld/%lld", (long long)limit.rlim_cur, (long long)limit.rlim_max);
limit.rlim_cur = maxMem;
setrlimit(RLIMIT_AS, &limit);
limit.rlim_cur = -1;
limit.rlim_max = -1;
getrlimit(RLIMIT_AS, &limit);
ALOGV("new limits: %lld/%lld", (long long)limit.rlim_cur, (long long)limit.rlim_max);
}
} // namespace android