mm/page_owner: keep track of page owners

[firefly-linux-kernel-4.4.55.git] / tools / vm / page_owner_sort.c

diff --git a/tools/vm/page_owner_sort.c b/tools/vm/page_owner_sort.c
new file mode 100644 (file)
index 0000000..77147b4
--- /dev/null
+++ b/tools/vm/page_owner_sort.c
@@ -0,0 +1,144 @@
+/*
+ * User-space helper to sort the output of /sys/kernel/debug/page_owner
+ *
+ * Example use:
+ * cat /sys/kernel/debug/page_owner > page_owner_full.txt
+ * grep -v ^PFN page_owner_full.txt > page_owner.txt
+ * ./sort page_owner.txt sorted_page_owner.txt
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+
+struct block_list {
+       char *txt;
+       int len;
+       int num;
+};
+
+
+static struct block_list *list;
+static int list_size;
+static int max_size;
+
+struct block_list *block_head;
+
+int read_block(char *buf, int buf_size, FILE *fin)
+{
+       char *curr = buf, *const buf_end = buf + buf_size;
+
+       while (buf_end - curr > 1 && fgets(curr, buf_end - curr, fin)) {
+               if (*curr == '\n') /* empty line */
+                       return curr - buf;
+               curr += strlen(curr);
+       }
+
+       return -1; /* EOF or no space left in buf. */
+}
+
+static int compare_txt(const void *p1, const void *p2)
+{
+       const struct block_list *l1 = p1, *l2 = p2;
+
+       return strcmp(l1->txt, l2->txt);
+}
+
+static int compare_num(const void *p1, const void *p2)
+{
+       const struct block_list *l1 = p1, *l2 = p2;
+
+       return l2->num - l1->num;
+}
+
+static void add_list(char *buf, int len)
+{
+       if (list_size != 0 &&
+           len == list[list_size-1].len &&
+           memcmp(buf, list[list_size-1].txt, len) == 0) {
+               list[list_size-1].num++;
+               return;
+       }
+       if (list_size == max_size) {
+               printf("max_size too small??\n");
+               exit(1);
+       }
+       list[list_size].txt = malloc(len+1);
+       list[list_size].len = len;
+       list[list_size].num = 1;
+       memcpy(list[list_size].txt, buf, len);
+       list[list_size].txt[len] = 0;
+       list_size++;
+       if (list_size % 1000 == 0) {
+               printf("loaded %d\r", list_size);
+               fflush(stdout);
+       }
+}
+
+#define BUF_SIZE       1024
+
+int main(int argc, char **argv)
+{
+       FILE *fin, *fout;
+       char buf[BUF_SIZE];
+       int ret, i, count;
+       struct block_list *list2;
+       struct stat st;
+
+       if (argc < 3) {
+               printf("Usage: ./program <input> <output>\n");
+               perror("open: ");
+               exit(1);
+       }
+
+       fin = fopen(argv[1], "r");
+       fout = fopen(argv[2], "w");
+       if (!fin || !fout) {
+               printf("Usage: ./program <input> <output>\n");
+               perror("open: ");
+               exit(1);
+       }
+
+       fstat(fileno(fin), &st);
+       max_size = st.st_size / 100; /* hack ... */
+
+       list = malloc(max_size * sizeof(*list));
+
+       for ( ; ; ) {
+               ret = read_block(buf, BUF_SIZE, fin);
+               if (ret < 0)
+                       break;
+
+               add_list(buf, ret);
+       }
+
+       printf("loaded %d\n", list_size);
+
+       printf("sorting ....\n");
+
+       qsort(list, list_size, sizeof(list[0]), compare_txt);
+
+       list2 = malloc(sizeof(*list) * list_size);
+
+       printf("culling\n");
+
+       for (i = count = 0; i < list_size; i++) {
+               if (count == 0 ||
+                   strcmp(list2[count-1].txt, list[i].txt) != 0) {
+                       list2[count++] = list[i];
+               } else {
+                       list2[count-1].num += list[i].num;
+               }
+       }
+
+       qsort(list2, count, sizeof(list[0]), compare_num);
+
+       for (i = 0; i < count; i++)
+               fprintf(fout, "%d times:\n%s\n", list2[i].num, list2[i].txt);
+
+       return 0;
+}