1 // SPDX-License-Identifier: GPL-2.0
3 * User-space helper to sort the output of /sys/kernel/debug/page_owner
6 * cat /sys/kernel/debug/page_owner > page_owner_full.txt
7 * grep -v ^PFN page_owner_full.txt > page_owner.txt
8 * ./page_owner_sort page_owner.txt sorted_page_owner.txt
10 * See Documentation/vm/page_owner.rst
15 #include <sys/types.h>
28 static struct block_list *list;
32 struct block_list *block_head;
34 int read_block(char *buf, int buf_size, FILE *fin)
36 char *curr = buf, *const buf_end = buf + buf_size;
38 while (buf_end - curr > 1 && fgets(curr, buf_end - curr, fin)) {
39 if (*curr == '\n') /* empty line */
44 return -1; /* EOF or no space left in buf. */
47 static int compare_txt(const void *p1, const void *p2)
49 const struct block_list *l1 = p1, *l2 = p2;
51 return strcmp(l1->txt, l2->txt);
54 static int compare_num(const void *p1, const void *p2)
56 const struct block_list *l1 = p1, *l2 = p2;
58 return l2->num - l1->num;
61 static void add_list(char *buf, int len)
64 len == list[list_size-1].len &&
65 memcmp(buf, list[list_size-1].txt, len) == 0) {
66 list[list_size-1].num++;
69 if (list_size == max_size) {
70 printf("max_size too small??\n");
73 list[list_size].txt = malloc(len+1);
74 list[list_size].len = len;
75 list[list_size].num = 1;
76 memcpy(list[list_size].txt, buf, len);
77 list[list_size].txt[len] = 0;
79 if (list_size % 1000 == 0) {
80 printf("loaded %d\r", list_size);
85 #define BUF_SIZE (128 * 1024)
87 int main(int argc, char **argv)
92 struct block_list *list2;
96 printf("Usage: ./program <input> <output>\n");
101 fin = fopen(argv[1], "r");
102 fout = fopen(argv[2], "w");
104 printf("Usage: ./program <input> <output>\n");
109 fstat(fileno(fin), &st);
110 max_size = st.st_size / 100; /* hack ... */
112 list = malloc(max_size * sizeof(*list));
113 buf = malloc(BUF_SIZE);
115 printf("Out of memory\n");
120 ret = read_block(buf, BUF_SIZE, fin);
127 printf("loaded %d\n", list_size);
129 printf("sorting ....\n");
131 qsort(list, list_size, sizeof(list[0]), compare_txt);
133 list2 = malloc(sizeof(*list) * list_size);
137 for (i = count = 0; i < list_size; i++) {
139 strcmp(list2[count-1].txt, list[i].txt) != 0) {
140 list2[count++] = list[i];
142 list2[count-1].num += list[i].num;
146 qsort(list2, count, sizeof(list[0]), compare_num);
148 for (i = 0; i < count; i++)
149 fprintf(fout, "%d times:\n%s\n", list2[i].num, list2[i].txt);