61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
/**
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* \file
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* \brief process that allocates some memory to test page faulting and page mapping
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*/
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/*
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* Copyright (c) 2016, ETH Zurich.
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* All rights reserved.
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*
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* This file is distributed under the terms in the attached LICENSE file.
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* If you do not find this file, copies can be found by writing to:
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* ETH Zurich D-INFK, Universitaetsstrasse 6, CH-8092 Zurich. Attn: Systems Group.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <aos/aos.h>
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#include <aos/paging.h>
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#define NUM_SMALL_BUFFERS 128
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static void test_large_buffer(void) {
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//allocate a 256 MiB buffer
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debug_printf("allocating 256MiB buffer\n");
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char * big_buf = malloc(1<<28);
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big_buf[0] = 'a';
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//only write to a small part of the large buffer
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for (int i = 0; i < (1 << 16); i += (1 << 12)) {
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big_buf[i] = 'b';
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}
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debug_printf("freeing 256MiB buffer\n");
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free(big_buf);
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}
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static void test_many_buffers(void) {
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char* buffers[NUM_SMALL_BUFFERS];
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for (int i = 0; i < NUM_SMALL_BUFFERS; ++i) {
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buffers[i] = malloc(4 * BASE_PAGE_SIZE);
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}
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//free the buffers in a different order
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for (int i = NUM_SMALL_BUFFERS - 1; i >= NUM_SMALL_BUFFERS / 2; --i) {
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free(buffers[i]);
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}
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for (int i = 0; i < NUM_SMALL_BUFFERS / 2; ++i) {
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free(buffers[i]);
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}
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}
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int main(int argc, char *argv[])
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{
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test_large_buffer();
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test_many_buffers();
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debug_printf("i am done!\n");
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} |