tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * User-space helper to sort the output of /sys/kernel/debug/page_owner
4 *
5 * Example use:
6 * cat /sys/kernel/debug/page_owner > page_owner_full.txt
7 * grep -v ^PFN page_owner_full.txt > page_owner.txt
8 * ./sort page_owner.txt sorted_page_owner.txt
9*/
10
11#include <stdio.h>
12#include <stdlib.h>
13#include <sys/types.h>
14#include <sys/stat.h>
15#include <fcntl.h>
16#include <unistd.h>
17#include <string.h>
18
19struct block_list {
20 char *txt;
21 int len;
22 int num;
23};
24
25
26static struct block_list *list;
27static int list_size;
28static int max_size;
29
30struct block_list *block_head;
31
32int read_block(char *buf, int buf_size, FILE *fin)
33{
34 char *curr = buf, *const buf_end = buf + buf_size;
35
36 while (buf_end - curr > 1 && fgets(curr, buf_end - curr, fin)) {
37 if (*curr == '\n') /* empty line */
38 return curr - buf;
39 curr += strlen(curr);
40 }
41
42 return -1; /* EOF or no space left in buf. */
43}
44
45static int compare_txt(const void *p1, const void *p2)
46{
47 const struct block_list *l1 = p1, *l2 = p2;
48
49 return strcmp(l1->txt, l2->txt);
50}
51
52static int compare_num(const void *p1, const void *p2)
53{
54 const struct block_list *l1 = p1, *l2 = p2;
55
56 return l2->num - l1->num;
57}
58
59static void add_list(char *buf, int len)
60{
61 if (list_size != 0 &&
62 len == list[list_size-1].len &&
63 memcmp(buf, list[list_size-1].txt, len) == 0) {
64 list[list_size-1].num++;
65 return;
66 }
67 if (list_size == max_size) {
68 printf("max_size too small??\n");
69 exit(1);
70 }
71 list[list_size].txt = malloc(len+1);
72 list[list_size].len = len;
73 list[list_size].num = 1;
74 memcpy(list[list_size].txt, buf, len);
75 list[list_size].txt[len] = 0;
76 list_size++;
77 if (list_size % 1000 == 0) {
78 printf("loaded %d\r", list_size);
79 fflush(stdout);
80 }
81}
82
83#define BUF_SIZE (128 * 1024)
84
85int main(int argc, char **argv)
86{
87 FILE *fin, *fout;
88 char *buf;
89 int ret, i, count;
90 struct block_list *list2;
91 struct stat st;
92
93 if (argc < 3) {
94 printf("Usage: ./program <input> <output>\n");
95 perror("open: ");
96 exit(1);
97 }
98
99 fin = fopen(argv[1], "r");
100 fout = fopen(argv[2], "w");
101 if (!fin || !fout) {
102 printf("Usage: ./program <input> <output>\n");
103 perror("open: ");
104 exit(1);
105 }
106
107 fstat(fileno(fin), &st);
108 max_size = st.st_size / 100; /* hack ... */
109
110 list = malloc(max_size * sizeof(*list));
111 buf = malloc(BUF_SIZE);
112 if (!list || !buf) {
113 printf("Out of memory\n");
114 exit(1);
115 }
116
117 for ( ; ; ) {
118 ret = read_block(buf, BUF_SIZE, fin);
119 if (ret < 0)
120 break;
121
122 add_list(buf, ret);
123 }
124
125 printf("loaded %d\n", list_size);
126
127 printf("sorting ....\n");
128
129 qsort(list, list_size, sizeof(list[0]), compare_txt);
130
131 list2 = malloc(sizeof(*list) * list_size);
132
133 printf("culling\n");
134
135 for (i = count = 0; i < list_size; i++) {
136 if (count == 0 ||
137 strcmp(list2[count-1].txt, list[i].txt) != 0) {
138 list2[count++] = list[i];
139 } else {
140 list2[count-1].num += list[i].num;
141 }
142 }
143
144 qsort(list2, count, sizeof(list[0]), compare_num);
145
146 for (i = 0; i < count; i++)
147 fprintf(fout, "%d times:\n%s\n", list2[i].num, list2[i].txt);
148
149 return 0;
150}