72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
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// pf_test.c - Page Fault Investigation
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#include "hakmem.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define SIZE (2 * 1024 * 1024)
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static void get_pf(unsigned long *soft, unsigned long *hard) {
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FILE* f = fopen("/proc/self/stat", "r");
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if (!f) { *soft = 0; *hard = 0; return; }
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unsigned long minflt = 0, majflt = 0;
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(void)fscanf(f, "%*d %*s %*c %*d %*d %*d %*d %*d %*u %lu %*u %lu",
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&minflt, &majflt);
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fclose(f);
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*soft = minflt;
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*hard = majflt;
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}
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void test_hakmem() {
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unsigned long pf_before, pf_after, hard_before, hard_after;
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printf("\n=== hakmem Test ===\n");
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hak_init();
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get_pf(&pf_before, &hard_before);
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for (int i = 0; i < 10; i++) {
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void* buf = hak_alloc_cs(SIZE);
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memset(buf, 0xEF, SIZE);
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hak_free_cs(buf, SIZE);
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}
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get_pf(&pf_after, &hard_after);
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printf("Page Faults: %lu (soft), %lu (hard)\n",
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pf_after - pf_before, hard_after - hard_before);
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hak_shutdown();
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}
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void test_system() {
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unsigned long pf_before, pf_after, hard_before, hard_after;
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printf("\n=== system malloc Test ===\n");
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get_pf(&pf_before, &hard_before);
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for (int i = 0; i < 10; i++) {
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void* buf = malloc(SIZE);
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memset(buf, 0xEF, SIZE);
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free(buf);
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}
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get_pf(&pf_after, &hard_after);
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printf("Page Faults: %lu (soft), %lu (hard)\n",
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pf_after - pf_before, hard_after - hard_before);
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}
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int main() {
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printf("=== Page Fault Comparison ===\n");
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printf("Size: 2MB × 10 iterations\n");
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test_system();
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test_hakmem();
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return 0;
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}
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