153 lines
3.0 KiB
C
153 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* User-space helper to sort the output of /sys/kernel/debug/page_owner
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*
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* Example use:
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* cat /sys/kernel/debug/page_owner > page_owner_full.txt
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* grep -v ^PFN page_owner_full.txt > page_owner.txt
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* ./page_owner_sort page_owner.txt sorted_page_owner.txt
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*
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* See Documentation/vm/page_owner.rst
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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struct block_list {
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char *txt;
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int len;
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int num;
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};
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static struct block_list *list;
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static int list_size;
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static int max_size;
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struct block_list *block_head;
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int read_block(char *buf, int buf_size, FILE *fin)
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{
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char *curr = buf, *const buf_end = buf + buf_size;
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while (buf_end - curr > 1 && fgets(curr, buf_end - curr, fin)) {
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if (*curr == '\n') /* empty line */
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return curr - buf;
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curr += strlen(curr);
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}
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return -1; /* EOF or no space left in buf. */
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}
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static int compare_txt(const void *p1, const void *p2)
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{
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const struct block_list *l1 = p1, *l2 = p2;
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return strcmp(l1->txt, l2->txt);
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}
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static int compare_num(const void *p1, const void *p2)
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{
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const struct block_list *l1 = p1, *l2 = p2;
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return l2->num - l1->num;
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}
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static void add_list(char *buf, int len)
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{
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if (list_size != 0 &&
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len == list[list_size-1].len &&
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memcmp(buf, list[list_size-1].txt, len) == 0) {
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list[list_size-1].num++;
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return;
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}
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if (list_size == max_size) {
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printf("max_size too small??\n");
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exit(1);
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}
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list[list_size].txt = malloc(len+1);
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list[list_size].len = len;
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list[list_size].num = 1;
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memcpy(list[list_size].txt, buf, len);
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list[list_size].txt[len] = 0;
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list_size++;
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if (list_size % 1000 == 0) {
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printf("loaded %d\r", list_size);
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fflush(stdout);
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}
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}
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#define BUF_SIZE (128 * 1024)
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int main(int argc, char **argv)
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{
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FILE *fin, *fout;
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char *buf;
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int ret, i, count;
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struct block_list *list2;
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struct stat st;
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if (argc < 3) {
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printf("Usage: ./program <input> <output>\n");
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perror("open: ");
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exit(1);
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}
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fin = fopen(argv[1], "r");
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fout = fopen(argv[2], "w");
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if (!fin || !fout) {
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printf("Usage: ./program <input> <output>\n");
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perror("open: ");
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exit(1);
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}
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fstat(fileno(fin), &st);
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max_size = st.st_size / 100; /* hack ... */
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list = malloc(max_size * sizeof(*list));
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buf = malloc(BUF_SIZE);
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if (!list || !buf) {
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printf("Out of memory\n");
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exit(1);
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}
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for ( ; ; ) {
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ret = read_block(buf, BUF_SIZE, fin);
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if (ret < 0)
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break;
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add_list(buf, ret);
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}
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printf("loaded %d\n", list_size);
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printf("sorting ....\n");
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qsort(list, list_size, sizeof(list[0]), compare_txt);
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list2 = malloc(sizeof(*list) * list_size);
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printf("culling\n");
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for (i = count = 0; i < list_size; i++) {
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if (count == 0 ||
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strcmp(list2[count-1].txt, list[i].txt) != 0) {
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list2[count++] = list[i];
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} else {
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list2[count-1].num += list[i].num;
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}
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}
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qsort(list2, count, sizeof(list[0]), compare_num);
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for (i = 0; i < count; i++)
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fprintf(fout, "%d times:\n%s\n", list2[i].num, list2[i].txt);
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return 0;
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}
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