tools/vm/page_owner_sort.c

   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
  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
  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
  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
  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
  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 }