aboutsummaryrefslogtreecommitdiff
path: root/tools/mm/page_owner_sort.c
blob: e1f264444342975f535a3954f05d0a018d97c1e8 (plain) (blame)
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
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
// 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/mm/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>
#include <linux/types.h>
#include <getopt.h>

#define bool int
#define true 1
#define false 0
#define TASK_COMM_LEN 16

struct block_list {
	char *txt;
	char *comm; // task command name
	char *stacktrace;
	__u64 ts_nsec;
	int len;
	int num;
	int page_num;
	pid_t pid;
	pid_t tgid;
	int allocator;
};
enum FILTER_BIT {
	FILTER_PID = 1<<1,
	FILTER_TGID = 1<<2,
	FILTER_COMM = 1<<3
};
enum CULL_BIT {
	CULL_PID = 1<<1,
	CULL_TGID = 1<<2,
	CULL_COMM = 1<<3,
	CULL_STACKTRACE = 1<<4,
	CULL_ALLOCATOR = 1<<5
};
enum ALLOCATOR_BIT {
	ALLOCATOR_CMA = 1<<1,
	ALLOCATOR_SLAB = 1<<2,
	ALLOCATOR_VMALLOC = 1<<3,
	ALLOCATOR_OTHERS = 1<<4
};
enum ARG_TYPE {
	ARG_TXT, ARG_COMM, ARG_STACKTRACE, ARG_ALLOC_TS, ARG_CULL_TIME,
	ARG_PAGE_NUM, ARG_PID, ARG_TGID, ARG_UNKNOWN, ARG_ALLOCATOR
};
enum SORT_ORDER {
	SORT_ASC = 1,
	SORT_DESC = -1,
};
enum COMP_FLAG {
	COMP_NO_FLAG = 0,
	COMP_ALLOC = 1<<0,
	COMP_PAGE_NUM = 1<<1,
	COMP_PID = 1<<2,
	COMP_STACK = 1<<3,
	COMP_NUM = 1<<4,
	COMP_TGID = 1<<5,
	COMP_COMM = 1<<6
};
struct filter_condition {
	pid_t *pids;
	pid_t *tgids;
	char **comms;
	int pids_size;
	int tgids_size;
	int comms_size;
};
struct sort_condition {
	int (**cmps)(const void *, const void *);
	int *signs;
	int size;
};
static struct filter_condition fc;
static struct sort_condition sc;
static regex_t order_pattern;
static regex_t pid_pattern;
static regex_t tgid_pattern;
static regex_t comm_pattern;
static regex_t ts_nsec_pattern;
static struct block_list *list;
static int list_size;
static int max_size;
static int cull;
static int filter;
static bool debug_on;

static void set_single_cmp(int (*cmp)(const void *, const void *), int sign);

int read_block(char *buf, char *ext_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)) {
			strcpy(ext_buf, curr);
			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_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 l1->num - l2->num;
}

static int compare_page_num(const void *p1, const void *p2)
{
	const struct block_list *l1 = p1, *l2 = p2;

	return l1->page_num - l2->page_num;
}

static int compare_pid(const void *p1, const void *p2)
{
	const struct block_list *l1 = p1, *l2 = p2;

	return l1->pid - l2->pid;
}

static int compare_tgid(const void *p1, const void *p2)
{
	const struct block_list *l1 = p1, *l2 = p2;

	return l1->tgid - l2->tgid;
}

static int compare_allocator(const void *p1, const void *p2)
{
	const struct block_list *l1 = p1, *l2 = p2;

	return l1->allocator - l2->allocator;
}

static int compare_comm(const void *p1, const void *p2)
{
	const struct block_list *l1 = p1, *l2 = p2;

	return strcmp(l1->comm, l2->comm);
}

static int compare_ts(const void *p1, const void *p2)
{
	const struct block_list *l1 = p1, *l2 = p2;

	return l1->ts_nsec < l2->ts_nsec ? -1 : 1;
}

static int compare_cull_condition(const void *p1, const void *p2)
{
	if (cull == 0)
		return compare_txt(p1, p2);
	if ((cull & CULL_STACKTRACE) && compare_stacktrace(p1, p2))
		return compare_stacktrace(p1, p2);
	if ((cull & CULL_PID) && compare_pid(p1, p2))
		return compare_pid(p1, p2);
	if ((cull & CULL_TGID) && compare_tgid(p1, p2))
		return compare_tgid(p1, p2);
	if ((cull & CULL_COMM) && compare_comm(p1, p2))
		return compare_comm(p1, p2);
	if ((cull & CULL_ALLOCATOR) && compare_allocator(p1, p2))
		return compare_allocator(p1, p2);
	return 0;
}

static int compare_sort_condition(const void *p1, const void *p2)
{
	int cmp = 0;

	for (int i = 0; i < sc.size; ++i)
		if (cmp == 0)
			cmp = sc.signs[i] * sc.cmps[i](p1, p2);
	return cmp;
}

static int remove_pattern(regex_t *pattern, char *buf, int len)
{
	regmatch_t pmatch[2];
	int err;

	err = regexec(pattern, buf, 2, pmatch, REG_NOTBOL);
	if (err != 0 || pmatch[1].rm_so == -1)
		return len;

	memcpy(buf + pmatch[1].rm_so,
		buf + pmatch[1].rm_eo, len - pmatch[1].rm_eo);

	return len - (pmatch[1].rm_eo - pmatch[1].rm_so);
}

static int search_pattern(regex_t *pattern, char *pattern_str, char *buf)
{
	int err, val_len;
	regmatch_t pmatch[2];

	err = regexec(pattern, buf, 2, pmatch, REG_NOTBOL);
	if (err != 0 || pmatch[1].rm_so == -1) {
		if (debug_on)
			fprintf(stderr, "no matching pattern in %s\n", buf);
		return -1;
	}
	val_len = pmatch[1].rm_eo - pmatch[1].rm_so;

	memcpy(pattern_str, buf + pmatch[1].rm_so, val_len);

	return 0;
}

static bool check_regcomp(regex_t *pattern, const char *regex)
{
	int err;

	err = regcomp(pattern, regex, REG_EXTENDED | REG_NEWLINE);
	if (err != 0 || pattern->re_nsub != 1) {
		fprintf(stderr, "Invalid pattern %s code %d\n", regex, err);
		return false;
	}
	return true;
}

static char **explode(char sep, const char *str, int *size)
{
	int count = 0, len = strlen(str);
	int lastindex = -1, j = 0;

	for (int i = 0; i < len; i++)
		if (str[i] == sep)
			count++;
	char **ret = calloc(++count, sizeof(char *));

	for (int i = 0; i < len; i++) {
		if (str[i] == sep) {
			ret[j] = calloc(i - lastindex, sizeof(char));
			memcpy(ret[j++], str + lastindex + 1, i - lastindex - 1);
			lastindex = i;
		}
	}
	if (lastindex <= len - 1) {
		ret[j] = calloc(len - lastindex, sizeof(char));
		memcpy(ret[j++], str + lastindex + 1, strlen(str) - 1 - lastindex);
	}
	*size = j;
	return ret;
}

static void free_explode(char **arr, int size)
{
	for (int i = 0; i < size; i++)
		free(arr[i]);
	free(arr);
}

# define FIELD_BUFF 25

static int get_page_num(char *buf)
{
	int order_val;
	char order_str[FIELD_BUFF] = {0};
	char *endptr;

	search_pattern(&order_pattern, order_str, buf);
	errno = 0;
	order_val = strtol(order_str, &endptr, 10);
	if (order_val > 64 || errno != 0 || endptr == order_str || *endptr != '\0') {
		if (debug_on)
			fprintf(stderr, "wrong order in follow buf:\n%s\n", buf);
		return 0;
	}

	return 1 << order_val;
}

static pid_t get_pid(char *buf)
{
	pid_t pid;
	char pid_str[FIELD_BUFF] = {0};
	char *endptr;

	search_pattern(&pid_pattern, pid_str, buf);
	errno = 0;
	pid = strtol(pid_str, &endptr, 10);
	if (errno != 0 || endptr == pid_str || *endptr != '\0') {
		if (debug_on)
			fprintf(stderr, "wrong/invalid pid in follow buf:\n%s\n", buf);
		return -1;
	}

	return pid;

}

static pid_t get_tgid(char *buf)
{
	pid_t tgid;
	char tgid_str[FIELD_BUFF] = {0};
	char *endptr;

	search_pattern(&tgid_pattern, tgid_str, buf);
	errno = 0;
	tgid = strtol(tgid_str, &endptr, 10);
	if (errno != 0 || endptr == tgid_str || *endptr != '\0') {
		if (debug_on)
			fprintf(stderr, "wrong/invalid tgid in follow buf:\n%s\n", buf);
		return -1;
	}

	return tgid;

}

static __u64 get_ts_nsec(char *buf)
{
	__u64 ts_nsec;
	char ts_nsec_str[FIELD_BUFF] = {0};
	char *endptr;

	search_pattern(&ts_nsec_pattern, ts_nsec_str, buf);
	errno = 0;
	ts_nsec = strtoull(ts_nsec_str, &endptr, 10);
	if (errno != 0 || endptr == ts_nsec_str || *endptr != '\0') {
		if (debug_on)
			fprintf(stderr, "wrong ts_nsec in follow buf:\n%s\n", buf);
		return -1;
	}

	return ts_nsec;
}

static char *get_comm(char *buf)
{
	char *comm_str = malloc(TASK_COMM_LEN);

	memset(comm_str, 0, TASK_COMM_LEN);

	search_pattern(&comm_pattern, comm_str, buf);
	errno = 0;
	if (errno != 0) {
		if (debug_on)
			fprintf(stderr, "wrong comm in follow buf:\n%s\n", buf);
		return NULL;
	}

	return comm_str;
}

static int get_arg_type(const char *arg)
{
	if (!strcmp(arg, "pid") || !strcmp(arg, "p"))
		return ARG_PID;
	else if (!strcmp(arg, "tgid") || !strcmp(arg, "tg"))
		return ARG_TGID;
	else if (!strcmp(arg, "name") || !strcmp(arg, "n"))
		return  ARG_COMM;
	else if (!strcmp(arg, "stacktrace") || !strcmp(arg, "st"))
		return ARG_STACKTRACE;
	else if (!strcmp(arg, "txt") || !strcmp(arg, "T"))
		return ARG_TXT;
	else if (!strcmp(arg, "alloc_ts") || !strcmp(arg, "at"))
		return ARG_ALLOC_TS;
	else if (!strcmp(arg, "allocator") || !strcmp(arg, "ator"))
		return ARG_ALLOCATOR;
	else {
		return ARG_UNKNOWN;
	}
}

static int get_allocator(const char *buf, const char *migrate_info)
{
	char *tmp, *first_line, *second_line;
	int allocator = 0;

	if (strstr(migrate_info, "CMA"))
		allocator |= ALLOCATOR_CMA;
	if (strstr(migrate_info, "slab"))
		allocator |= ALLOCATOR_SLAB;
	tmp = strstr(buf, "__vmalloc_node_range");
	if (tmp) {
		second_line = tmp;
		while (*tmp != '\n')
			tmp--;
		tmp--;
		while (*tmp != '\n')
			tmp--;
		first_line = ++tmp;
		tmp = strstr(tmp, "alloc_pages");
		if (tmp && first_line <= tmp && tmp < second_line)
			allocator |= ALLOCATOR_VMALLOC;
	}
	if (allocator == 0)
		allocator = ALLOCATOR_OTHERS;
	return allocator;
}

static bool match_num_list(int num, int *list, int list_size)
{
	for (int i = 0; i < list_size; ++i)
		if (list[i] == num)
			return true;
	return false;
}

static bool match_str_list(const char *str, char **list, int list_size)
{
	for (int i = 0; i < list_size; ++i)
		if (!strcmp(list[i], str))
			return true;
	return false;
}

static bool is_need(char *buf)
{
	if ((filter & FILTER_PID) && !match_num_list(get_pid(buf), fc.pids, fc.pids_size))
		return false;
	if ((filter & FILTER_TGID) &&
		!match_num_list(get_tgid(buf), fc.tgids, fc.tgids_size))
		return false;

	char *comm = get_comm(buf);

	if ((filter & FILTER_COMM) &&
	!match_str_list(comm, fc.comms, fc.comms_size)) {
		free(comm);
		return false;
	}
	free(comm);
	return true;
}

static bool add_list(char *buf, int len, char *ext_buf)
{
	if (list_size == max_size) {
		fprintf(stderr, "max_size too small??\n");
		return false;
	}
	if (!is_need(buf))
		return true;
	list[list_size].pid = get_pid(buf);
	list[list_size].tgid = get_tgid(buf);
	list[list_size].comm = get_comm(buf);
	list[list_size].txt = malloc(len+1);
	if (!list[list_size].txt) {
		fprintf(stderr, "Out of memory\n");
		return false;
	}
	memcpy(list[list_size].txt, buf, len);
	if (sc.cmps[0] != compare_ts) {
		len = remove_pattern(&ts_nsec_pattern, list[list_size].txt, len);
	}
	list[list_size].txt[len] = 0;
	list[list_size].len = len;
	list[list_size].num = 1;
	list[list_size].page_num = get_page_num(buf);

	list[list_size].stacktrace = strchr(list[list_size].txt, '\n') ?: "";
	if (*list[list_size].stacktrace == '\n')
		list[list_size].stacktrace++;
	list[list_size].ts_nsec = get_ts_nsec(buf);
	list[list_size].allocator = get_allocator(buf, ext_buf);
	list_size++;
	if (list_size % 1000 == 0) {
		printf("loaded %d\r", list_size);
		fflush(stdout);
	}
	return true;
}

static bool parse_cull_args(const char *arg_str)
{
	int size = 0;
	char **args = explode(',', arg_str, &size);

	for (int i = 0; i < size; ++i) {
		int arg_type = get_arg_type(args[i]);

		if (arg_type == ARG_PID)
			cull |= CULL_PID;
		else if (arg_type == ARG_TGID)
			cull |= CULL_TGID;
		else if (arg_type == ARG_COMM)
			cull |= CULL_COMM;
		else if (arg_type == ARG_STACKTRACE)
			cull |= CULL_STACKTRACE;
		else if (arg_type == ARG_ALLOCATOR)
			cull |= CULL_ALLOCATOR;
		else {
			free_explode(args, size);
			return false;
		}
	}
	free_explode(args, size);
	if (sc.size == 0)
		set_single_cmp(compare_num, SORT_DESC);
	return true;
}

static void set_single_cmp(int (*cmp)(const void *, const void *), int sign)
{
	if (sc.signs == NULL || sc.size < 1)
		sc.signs = calloc(1, sizeof(int));
	sc.signs[0] = sign;
	if (sc.cmps == NULL || sc.size < 1)
		sc.cmps = calloc(1, sizeof(int *));
	sc.cmps[0] = cmp;
	sc.size = 1;
}

static bool parse_sort_args(const char *arg_str)
{
	int size = 0;

	if (sc.size != 0) { /* reset sort_condition */
		free(sc.signs);
		free(sc.cmps);
		size = 0;
	}

	char **args = explode(',', arg_str, &size);

	sc.signs = calloc(size, sizeof(int));
	sc.cmps = calloc(size, sizeof(int *));
	for (int i = 0; i < size; ++i) {
		int offset = 0;

		sc.signs[i] = SORT_ASC;
		if (args[i][0] == '-' || args[i][0] == '+') {
			if (args[i][0] == '-')
				sc.signs[i] = SORT_DESC;
			offset = 1;
		}

		int arg_type = get_arg_type(args[i]+offset);

		if (arg_type == ARG_PID)
			sc.cmps[i] = compare_pid;
		else if (arg_type == ARG_TGID)
			sc.cmps[i] = compare_tgid;
		else if (arg_type == ARG_COMM)
			sc.cmps[i] = compare_comm;
		else if (arg_type == ARG_STACKTRACE)
			sc.cmps[i] = compare_stacktrace;
		else if (arg_type == ARG_ALLOC_TS)
			sc.cmps[i] = compare_ts;
		else if (arg_type == ARG_TXT)
			sc.cmps[i] = compare_txt;
		else if (arg_type == ARG_ALLOCATOR)
			sc.cmps[i] = compare_allocator;
		else {
			free_explode(args, size);
			sc.size = 0;
			return false;
		}
	}
	sc.size = size;
	free_explode(args, size);
	return true;
}

static int *parse_nums_list(char *arg_str, int *list_size)
{
	int size = 0;
	char **args = explode(',', arg_str, &size);
	int *list = calloc(size, sizeof(int));

	errno = 0;
	for (int i = 0; i < size; ++i) {
		char *endptr = NULL;

		list[i] = strtol(args[i], &endptr, 10);
		if (errno != 0 || endptr == args[i] || *endptr != '\0') {
			free(list);
			return NULL;
		}
	}
	*list_size = size;
	free_explode(args, size);
	return list;
}

static void print_allocator(FILE *out, int allocator)
{
	fprintf(out, "allocated by ");
	if (allocator & ALLOCATOR_CMA)
		fprintf(out, "CMA ");
	if (allocator & ALLOCATOR_SLAB)
		fprintf(out, "SLAB ");
	if (allocator & ALLOCATOR_VMALLOC)
		fprintf(out, "VMALLOC ");
	if (allocator & ALLOCATOR_OTHERS)
		fprintf(out, "OTHERS ");
}

#define BUF_SIZE	(128 * 1024)

static void usage(void)
{
	printf("Usage: ./page_owner_sort [OPTIONS] <input> <output>\n"
		"-a\t\t\tSort by memory allocation time.\n"
		"-m\t\t\tSort by total memory.\n"
		"-n\t\t\tSort by task command name.\n"
		"-p\t\t\tSort by pid.\n"
		"-P\t\t\tSort by tgid.\n"
		"-s\t\t\tSort by the stacktrace.\n"
		"-t\t\t\tSort by number of times record is seen (default).\n\n"
		"--pid <pidlist>\t\tSelect by pid. This selects the information"
		" of\n\t\t\tblocks whose process ID numbers appear in <pidlist>.\n"
		"--tgid <tgidlist>\tSelect by tgid. This selects the information"
		" of\n\t\t\tblocks whose Thread Group ID numbers appear in "
		"<tgidlist>.\n"
		"--name <cmdlist>\tSelect by command name. This selects the"
		" information\n\t\t\tof blocks whose command name appears in"
		" <cmdlist>.\n"
		"--cull <rules>\t\tCull by user-defined rules. <rules> is a "
		"single\n\t\t\targument in the form of a comma-separated list "
		"with some\n\t\t\tcommon fields predefined (pid, tgid, comm, "
		"stacktrace, allocator)\n"
		"--sort <order>\t\tSpecify sort order as: [+|-]key[,[+|-]key[,...]]\n"
	);
}

int main(int argc, char **argv)
{
	FILE *fin, *fout;
	char *buf, *ext_buf;
	int i, count, compare_flag;
	struct stat st;
	int opt;
	struct option longopts[] = {
		{ "pid", required_argument, NULL, 1 },
		{ "tgid", required_argument, NULL, 2 },
		{ "name", required_argument, NULL, 3 },
		{ "cull",  required_argument, NULL, 4 },
		{ "sort",  required_argument, NULL, 5 },
		{ 0, 0, 0, 0},
	};

	compare_flag = COMP_NO_FLAG;

	while ((opt = getopt_long(argc, argv, "admnpstP", longopts, NULL)) != -1)
		switch (opt) {
		case 'a':
			compare_flag |= COMP_ALLOC;
			break;
		case 'd':
			debug_on = true;
			break;
		case 'm':
			compare_flag |= COMP_PAGE_NUM;
			break;
		case 'p':
			compare_flag |= COMP_PID;
			break;
		case 's':
			compare_flag |= COMP_STACK;
			break;
		case 't':
			compare_flag |= COMP_NUM;
			break;
		case 'P':
			compare_flag |= COMP_TGID;
			break;
		case 'n':
			compare_flag |= COMP_COMM;
			break;
		case 1:
			filter = filter | FILTER_PID;
			fc.pids = parse_nums_list(optarg, &fc.pids_size);
			if (fc.pids == NULL) {
				fprintf(stderr, "wrong/invalid pid in from the command line:%s\n",
						optarg);
				exit(1);
			}
			break;
		case 2:
			filter = filter | FILTER_TGID;
			fc.tgids = parse_nums_list(optarg, &fc.tgids_size);
			if (fc.tgids == NULL) {
				fprintf(stderr, "wrong/invalid tgid in from the command line:%s\n",
						optarg);
				exit(1);
			}
			break;
		case 3:
			filter = filter | FILTER_COMM;
			fc.comms = explode(',', optarg, &fc.comms_size);
			break;
		case 4:
			if (!parse_cull_args(optarg)) {
				fprintf(stderr, "wrong argument after --cull option:%s\n",
						optarg);
				exit(1);
			}
			break;
		case 5:
			if (!parse_sort_args(optarg)) {
				fprintf(stderr, "wrong argument after --sort option:%s\n",
						optarg);
				exit(1);
			}
			break;
		default:
			usage();
			exit(1);
		}

	if (optind >= (argc - 1)) {
		usage();
		exit(1);
	}

	/* Only one compare option is allowed, yet we also want handle the
	 * default case were no option is provided, but we still want to
	 * match the behavior of the -t option (compare by number of times
	 * a record is seen
	 */
	switch (compare_flag) {
	case COMP_ALLOC:
		set_single_cmp(compare_ts, SORT_ASC);
		break;
	case COMP_PAGE_NUM:
		set_single_cmp(compare_page_num, SORT_DESC);
		break;
	case COMP_PID:
		set_single_cmp(compare_pid, SORT_ASC);
		break;
	case COMP_STACK:
		set_single_cmp(compare_stacktrace, SORT_ASC);
		break;
	case COMP_NO_FLAG:
	case COMP_NUM:
		set_single_cmp(compare_num, SORT_DESC);
		break;
	case COMP_TGID:
		set_single_cmp(compare_tgid, SORT_ASC);
		break;
	case COMP_COMM:
		set_single_cmp(compare_comm, SORT_ASC);
		break;
	default:
		usage();
		exit(1);
	}

	fin = fopen(argv[optind], "r");
	fout = fopen(argv[optind + 1], "w");
	if (!fin || !fout) {
		usage();
		perror("open: ");
		exit(1);
	}

	if (!check_regcomp(&order_pattern, "order\\s*([0-9]*),"))
		goto out_order;
	if (!check_regcomp(&pid_pattern, "pid\\s*([0-9]*),"))
		goto out_pid;
	if (!check_regcomp(&tgid_pattern, "tgid\\s*([0-9]*) "))
		goto out_tgid;
	if (!check_regcomp(&comm_pattern, "tgid\\s*[0-9]*\\s*\\((.*)\\),\\s*ts"))
		goto out_comm;
	if (!check_regcomp(&ts_nsec_pattern, "ts\\s*([0-9]*)\\s*ns"))
		goto out_ts;

	fstat(fileno(fin), &st);
	max_size = st.st_size / 100; /* hack ... */

	list = malloc(max_size * sizeof(*list));
	buf = malloc(BUF_SIZE);
	ext_buf = malloc(BUF_SIZE);
	if (!list || !buf || !ext_buf) {
		fprintf(stderr, "Out of memory\n");
		goto out_free;
	}

	for ( ; ; ) {
		int buf_len = read_block(buf, ext_buf, BUF_SIZE, fin);

		if (buf_len < 0)
			break;
		if (!add_list(buf, buf_len, ext_buf))
			goto out_free;
	}

	printf("loaded %d\n", list_size);

	printf("sorting ....\n");

	qsort(list, list_size, sizeof(list[0]), compare_cull_condition);

	printf("culling\n");

	for (i = count = 0; i < list_size; i++) {
		if (count == 0 ||
		    compare_cull_condition((void *)(&list[count-1]), (void *)(&list[i])) != 0) {
			list[count++] = list[i];
		} else {
			list[count-1].num += list[i].num;
			list[count-1].page_num += list[i].page_num;
		}
	}

	qsort(list, count, sizeof(list[0]), compare_sort_condition);

	for (i = 0; i < count; i++) {
		if (cull == 0) {
			fprintf(fout, "%d times, %d pages, ", list[i].num, list[i].page_num);
			print_allocator(fout, list[i].allocator);
			fprintf(fout, ":\n%s\n", list[i].txt);
		}
		else {
			fprintf(fout, "%d times, %d pages",
					list[i].num, list[i].page_num);
			if (cull & CULL_PID || filter & FILTER_PID)
				fprintf(fout, ", PID %d", list[i].pid);
			if (cull & CULL_TGID || filter & FILTER_TGID)
				fprintf(fout, ", TGID %d", list[i].tgid);
			if (cull & CULL_COMM || filter & FILTER_COMM)
				fprintf(fout, ", task_comm_name: %s", list[i].comm);
			if (cull & CULL_ALLOCATOR) {
				fprintf(fout, ", ");
				print_allocator(fout, list[i].allocator);
			}
			if (cull & CULL_STACKTRACE)
				fprintf(fout, ":\n%s", list[i].stacktrace);
			fprintf(fout, "\n");
		}
	}

out_free:
	if (ext_buf)
		free(ext_buf);
	if (buf)
		free(buf);
	if (list)
		free(list);
out_ts:
	regfree(&ts_nsec_pattern);
out_comm:
	regfree(&comm_pattern);
out_tgid:
	regfree(&tgid_pattern);
out_pid:
	regfree(&pid_pattern);
out_order:
	regfree(&order_pattern);

	return 0;
}