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// SPDX-License-Identifier: GPL-2.0
/*
* 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
* ./page_owner_sort page_owner_full.txt sorted_page_owner.txt
* Or sort by total memory:
* ./page_owner_sort -m page_owner_full.txt sorted_page_owner.txt
*
* See Documentation/vm/page_owner.rst
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <regex.h>
#include <errno.h>
struct block_list {
char *txt;
char *stacktrace;
int len;
int num;
int page_num;
};
static regex_t order_pattern;
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;
if (!strncmp(curr, "PFN", 3))
continue;
curr += strlen(curr);
}
return -1; /* EOF or no space left in buf. */
}
static int compare_stacktrace(const void *p1, const void *p2)
{
const struct block_list *l1 = p1, *l2 = p2;
return strcmp(l1->stacktrace, l2->stacktrace);
}
static int compare_num(const void *p1, const void *p2)
{
const struct block_list *l1 = p1, *l2 = p2;
return l2->num - l1->num;
}
static int compare_page_num(const void *p1, const void *p2)
{
const struct block_list *l1 = p1, *l2 = p2;
return l2->page_num - l1->page_num;
}
static int get_page_num(char *buf)
{
int err, val_len, order_val;
char order_str[4] = {0};
char *endptr;
regmatch_t pmatch[2];
err = regexec(&order_pattern, buf, 2, pmatch, REG_NOTBOL);
if (err != 0 || pmatch[1].rm_so == -1) {
printf("no order pattern in %s\n", buf);
return 0;
}
val_len = pmatch[1].rm_eo - pmatch[1].rm_so;
if (val_len > 2) /* max_order should not exceed 2 digits */
goto wrong_order;
memcpy(order_str, buf + pmatch[1].rm_so, val_len);
errno = 0;
order_val = strtol(order_str, &endptr, 10);
if (errno != 0 || endptr == order_str || *endptr != '\0')
goto wrong_order;
return 1 << order_val;
wrong_order:
printf("wrong order in follow buf:\n%s\n", buf);
return 0;
}
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++;
list[list_size-1].page_num += get_page_num(buf);
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;
list[list_size].page_num = get_page_num(buf);
memcpy(list[list_size].txt, buf, len);
list[list_size].txt[len] = 0;
list[list_size].stacktrace = strchr(list[list_size].txt, '\n') ?: "";
list_size++;
if (list_size % 1000 == 0) {
printf("loaded %d\r", list_size);
fflush(stdout);
}
}
#define BUF_SIZE (128 * 1024)
static void usage(void)
{
printf("Usage: ./page_owner_sort [OPTIONS] <input> <output>\n"
"-m Sort by total memory.\n"
"-s Sort by the stack trace.\n"
"-t Sort by times (default).\n"
);
}
int main(int argc, char **argv)
{
int (*cmp)(const void *, const void *) = compare_num;
FILE *fin, *fout;
char *buf;
int ret, i, count;
struct block_list *list2;
struct stat st;
int err;
int opt;
while ((opt = getopt(argc, argv, "mst")) != -1)
switch (opt) {
case 'm':
cmp = compare_page_num;
break;
case 's':
cmp = compare_stacktrace;
break;
case 't':
cmp = compare_num;
break;
default:
usage();
exit(1);
}
if (optind >= (argc - 1)) {
usage();
exit(1);
}
fin = fopen(argv[optind], "r");
fout = fopen(argv[optind + 1], "w");
if (!fin || !fout) {
usage();
perror("open: ");
exit(1);
}
err = regcomp(&order_pattern, "order\\s*([0-9]*),", REG_EXTENDED|REG_NEWLINE);
if (err != 0 || order_pattern.re_nsub != 1) {
printf("%s: Invalid pattern 'order\\s*([0-9]*),' code %d\n",
argv[0], err);
exit(1);
}
fstat(fileno(fin), &st);
max_size = st.st_size / 100; /* hack ... */
list = malloc(max_size * sizeof(*list));
buf = malloc(BUF_SIZE);
if (!list || !buf) {
printf("Out of memory\n");
exit(1);
}
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_stacktrace);
list2 = malloc(sizeof(*list) * list_size);
if (!list2) {
printf("Out of memory\n");
exit(1);
}
printf("culling\n");
for (i = count = 0; i < list_size; i++) {
if (count == 0 ||
strcmp(list2[count-1].stacktrace, list[i].stacktrace) != 0) {
list2[count++] = list[i];
} else {
list2[count-1].num += list[i].num;
list2[count-1].page_num += list[i].page_num;
}
}
qsort(list2, count, sizeof(list[0]), cmp);
for (i = 0; i < count; i++)
fprintf(fout, "%d times, %d pages:\n%s\n",
list2[i].num, list2[i].page_num, list2[i].txt);
regfree(&order_pattern);
return 0;
}
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