summaryrefslogtreecommitdiff
path: root/tools/vm/page_owner_sort.c
blob: 0e75f22c94750b8e375f81c13e3b2851d1f7e88a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
// 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
 *
 * 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>

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;
		if (!strncmp(curr, "PFN", 3))
			continue;
		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	(128 * 1024)

int main(int argc, char **argv)
{
	FILE *fin, *fout;
	char *buf;
	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));
	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_txt);

	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].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;
}