50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
/*
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* Copyright (C) 2010 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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*/
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#include <android/log.h>
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#include <jni.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <sstream>
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#define LOG(...) __android_log_write(ANDROID_LOG_INFO, "ALLOC-STRESS", __VA_ARGS__)
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size_t s = 4 * (1 << 20); // 4 MB
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volatile void *gptr;
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extern "C" JNIEXPORT void JNICALL
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Java_com_android_server_cts_device_statsdatom_MemoryHogger_allocate(JNIEnv *, jobject /* this */) {
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volatile void *ptr;
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long long allocCount = 0;
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while (1) {
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ptr = mmap(NULL, s, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
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if (ptr == MAP_FAILED) {
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// Likely exhausted address space
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break;
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}
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memset((void *)ptr, (int)allocCount >> 10, s);
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allocCount += s;
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std::stringstream ss;
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ss << "total alloc: " << allocCount / (1 << 20);
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LOG(ss.str().c_str());
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gptr = ptr;
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// If we are too aggressive allocating, we will end up triggering the
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// OOM reaper instead of LMKd.
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usleep(5000);
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}
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}
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