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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
// 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;
int len;
int num;
int page_num;
};
static int sort_by_memory;
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_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 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_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 [-m] <input> <output>\n"
"-m Sort by total memory. If this option is unset, sort by times\n"
);
}
int main(int argc, char **argv)
{
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, "m")) != -1)
switch (opt) {
case 'm':
sort_by_memory = 1;
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_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;
list2[count-1].page_num += list[i].page_num;
}
}
if (sort_by_memory)
qsort(list2, count, sizeof(list[0]), compare_page_num);
else
qsort(list2, count, sizeof(list[0]), compare_num);
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;
}
|
