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