46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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static unsigned size_classes[] = {
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/* large */ 4 * 1024 * 1024,
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/* 0 */ 0,
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/* 16 */ 16, 32, 48, 64, 80, 96, 112, 128,
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/* 32 */ 160, 192, 224, 256,
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/* 64 */ 320, 384, 448, 512,
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/* 128 */ 640, 768, 896, 1024,
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/* 256 */ 1280, 1536, 1792, 2048,
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/* 512 */ 2560, 3072, 3584, 4096,
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/* 1024 */ 5120, 6144, 7168, 8192,
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/* 2048 */ 10240, 12288, 14336, 16384
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};
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#define N_SIZE_CLASSES (sizeof(size_classes) / sizeof(size_classes[0]))
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static const size_t canary_size = SLAB_CANARY ? sizeof(uint64_t) : 0;
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int main(void) {
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for (unsigned i = 2; i < N_SIZE_CLASSES; i++) {
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size_classes[i] -= canary_size;
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}
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void *p[N_SIZE_CLASSES];
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for (unsigned i = 0; i < N_SIZE_CLASSES; i++) {
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unsigned size = size_classes[i];
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p[i] = malloc(size);
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if (!p) {
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return 1;
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}
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void *q = malloc(size);
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if (!q) {
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return 1;
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}
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if (i != 0) {
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printf("%zu to %zu: %zd\n", size_classes[i - 1], size, p[i] - p[i - 1]);
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}
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printf("%zu to %zu: %zd\n", size, size, q - p[i]);
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}
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return 0;
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}
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