[linux-block.git] / tools / perf / builtin-diff.c

/*
 * builtin-diff.c
 *
 * Builtin diff command: Analyze two perf.data input files, look up and read
 * DSOs and symbol information, sort them and produce a diff.
 */
#include "builtin.h"

#include "util/debug.h"
#include "util/event.h"
#include "util/hist.h"
#include "util/session.h"
#include "util/sort.h"
#include "util/symbol.h"
#include "util/util.h"

#include <stdlib.h>

static char const *input_old = "perf.data.old",
		  *input_new = "perf.data";
static char	  diff__default_sort_order[] = "dso,symbol";
static int  force;
static bool show_displacement;

static int perf_session__add_hist_entry(struct perf_session *self,
					struct addr_location *al, u64 count)
{
	bool hit;
	struct hist_entry *he = __perf_session__add_hist_entry(self, al, NULL,
							       count, &hit);
	if (he == NULL)
		return -ENOMEM;

	if (hit)
		he->count += count;

	return 0;
}

static int diff__process_sample_event(event_t *event, struct perf_session *session)
{
	struct addr_location al;
	struct sample_data data = { .period = 1, };

	dump_printf("(IP, %d): %d: %p\n", event->header.misc,
		    event->ip.pid, (void *)(long)event->ip.ip);

	if (event__preprocess_sample(event, session, &al, NULL) < 0) {
		pr_warning("problem processing %d event, skipping it.\n",
			   event->header.type);
		return -1;
	}

	if (al.filtered)
		return 0;

	event__parse_sample(event, session->sample_type, &data);

	if (al.sym && perf_session__add_hist_entry(session, &al, data.period)) {
		pr_warning("problem incrementing symbol count, skipping event\n");
		return -1;
	}

	session->events_stats.total += data.period;
	return 0;
}

static struct perf_event_ops event_ops = {
	.process_sample_event = diff__process_sample_event,
	.process_mmap_event   = event__process_mmap,
	.process_comm_event   = event__process_comm,
	.process_exit_event   = event__process_task,
	.process_fork_event   = event__process_task,
	.process_lost_event   = event__process_lost,
};

static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
						    struct hist_entry *he)
{
	struct rb_node **p = &root->rb_node;
	struct rb_node *parent = NULL;
	struct hist_entry *iter;

	while (*p != NULL) {
		int cmp;
		parent = *p;
		iter = rb_entry(parent, struct hist_entry, rb_node);

		cmp = strcmp(he->map->dso->name, iter->map->dso->name);
		if (cmp > 0)
			p = &(*p)->rb_left;
		else if (cmp < 0)
			p = &(*p)->rb_right;
		else {
			cmp = strcmp(he->sym->name, iter->sym->name);
			if (cmp > 0)
				p = &(*p)->rb_left;
			else
				p = &(*p)->rb_right;
		}
	}

	rb_link_node(&he->rb_node, parent, p);
	rb_insert_color(&he->rb_node, root);
}

static void perf_session__resort_by_name(struct perf_session *self)
{
	unsigned long position = 1;
	struct rb_root tmp = RB_ROOT;
	struct rb_node *next = rb_first(&self->hists);

	while (next != NULL) {
		struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);

		next = rb_next(&n->rb_node);
		rb_erase(&n->rb_node, &self->hists);
		n->position = position++;
		perf_session__insert_hist_entry_by_name(&tmp, n);
	}

	self->hists = tmp;
}

static struct hist_entry *
perf_session__find_hist_entry_by_name(struct perf_session *self,
				      struct hist_entry *he)
{
	struct rb_node *n = self->hists.rb_node;

	while (n) {
		struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
		int cmp = strcmp(he->map->dso->name, iter->map->dso->name);

		if (cmp > 0)
			n = n->rb_left;
		else if (cmp < 0)
			n = n->rb_right;
		else {
			cmp = strcmp(he->sym->name, iter->sym->name);
			if (cmp > 0)
				n = n->rb_left;
			else if (cmp < 0)
				n = n->rb_right;
			else
				return iter;
		}
	}

	return NULL;
}

static void perf_session__match_hists(struct perf_session *old_session,
				      struct perf_session *new_session)
{
	struct rb_node *nd;

	perf_session__resort_by_name(old_session);

	for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) {
		struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
		pos->pair = perf_session__find_hist_entry_by_name(old_session, pos);
	}
}

static int __cmd_diff(void)
{
	int ret, i;
	struct perf_session *session[2];

	session[0] = perf_session__new(input_old, O_RDONLY, force);
	session[1] = perf_session__new(input_new, O_RDONLY, force);
	if (session[0] == NULL || session[1] == NULL)
		return -ENOMEM;

	for (i = 0; i < 2; ++i) {
		ret = perf_session__process_events(session[i], &event_ops);
		if (ret)
			goto out_delete;
		perf_session__output_resort(session[i], session[i]->events_stats.total);
	}

	perf_session__match_hists(session[0], session[1]);
	perf_session__fprintf_hists(session[1], session[0],
				    show_displacement, stdout);
out_delete:
	for (i = 0; i < 2; ++i)
		perf_session__delete(session[i]);
	return ret;
}

static const char * const diff_usage[] = {
	"perf diff [<options>] [old_file] [new_file]",
	NULL,
};

static const struct option options[] = {
	OPT_BOOLEAN('v', "verbose", &verbose,
		    "be more verbose (show symbol address, etc)"),
	OPT_BOOLEAN('m', "displacement", &show_displacement,
		    "Show position displacement relative to baseline"),
	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
		    "dump raw trace in ASCII"),
	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
	OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
		    "load module symbols - WARNING: use only with -k and LIVE kernel"),
	OPT_BOOLEAN('P', "full-paths", &symbol_conf.full_paths,
		    "Don't shorten the pathnames taking into account the cwd"),
	OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
		   "only consider symbols in these dsos"),
	OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
		   "only consider symbols in these comms"),
	OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
		   "only consider these symbols"),
	OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
		   "sort by key(s): pid, comm, dso, symbol, parent"),
	OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
		   "separator for columns, no spaces will be added between "
		   "columns '.' is reserved."),
	OPT_END()
};

int cmd_diff(int argc, const char **argv, const char *prefix __used)
{
	sort_order = diff__default_sort_order;
	argc = parse_options(argc, argv, options, diff_usage, 0);
	if (argc) {
		if (argc > 2)
			usage_with_options(diff_usage, options);
		if (argc == 2) {
			input_old = argv[0];
			input_new = argv[1];
		} else
			input_new = argv[0];
	}

	symbol_conf.exclude_other = false;
	if (symbol__init() < 0)
		return -1;

	setup_sorting(diff_usage, options);
	setup_pager();

	sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
	sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
	sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);

	return __cmd_diff();
}
Commit	Line	Data
86a9eee0 ACM	1	/*
	2	* builtin-diff.c
	3	*
	4	* Builtin diff command: Analyze two perf.data input files, look up and read
	5	* DSOs and symbol information, sort them and produce a diff.
	6	*/
	7	#include "builtin.h"
	8
	9	#include "util/debug.h"
	10	#include "util/event.h"
	11	#include "util/hist.h"
	12	#include "util/session.h"
	13	#include "util/sort.h"
	14	#include "util/symbol.h"
	15	#include "util/util.h"
	16
	17	#include <stdlib.h>
	18
c351c281 ACM	19	static char const *input_old = "perf.data.old",
c351c281 ACM	20	*input_new = "perf.data";
604c5c92	21	static char diff__default_sort_order[] = "dso,symbol";
c351c281 ACM	22	static int force;
c351c281 ACM	23	static bool show_displacement;
86a9eee0	24
86a9eee0 ACM	25	static int perf_session__add_hist_entry(struct perf_session *self,
	26	struct addr_location *al, u64 count)
	27	{
	28	bool hit;
	29	struct hist_entry *he = __perf_session__add_hist_entry(self, al, NULL,
	30	count, &hit);
	31	if (he == NULL)
	32	return -ENOMEM;
	33
	34	if (hit)
	35	he->count += count;
	36
	37	return 0;
	38	}
	39
	40	static int diff__process_sample_event(event_t event, struct perf_session session)
	41	{
	42	struct addr_location al;
	43	struct sample_data data = { .period = 1, };
	44
	45	dump_printf("(IP, %d): %d: %p\n", event->header.misc,
	46	event->ip.pid, (void *)(long)event->ip.ip);
	47
	48	if (event__preprocess_sample(event, session, &al, NULL) < 0) {
	49	pr_warning("problem processing %d event, skipping it.\n",
	50	event->header.type);
	51	return -1;
	52	}
	53
c410a338 ACM	54	if (al.filtered)
	55	return 0;
	56
86a9eee0 ACM	57	event__parse_sample(event, session->sample_type, &data);
	58
	59	if (al.sym && perf_session__add_hist_entry(session, &al, data.period)) {
	60	pr_warning("problem incrementing symbol count, skipping event\n");
	61	return -1;
	62	}
	63
	64	session->events_stats.total += data.period;
	65	return 0;
	66	}
	67
	68	static struct perf_event_ops event_ops = {
	69	.process_sample_event = diff__process_sample_event,
	70	.process_mmap_event = event__process_mmap,
	71	.process_comm_event = event__process_comm,
	72	.process_exit_event = event__process_task,
	73	.process_fork_event = event__process_task,
	74	.process_lost_event = event__process_lost,
	75	};
	76
	77	static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
	78	struct hist_entry *he)
	79	{
	80	struct rb_node **p = &root->rb_node;
	81	struct rb_node *parent = NULL;
	82	struct hist_entry *iter;
	83
	84	while (*p != NULL) {
	85	int cmp;
	86	parent = *p;
	87	iter = rb_entry(parent, struct hist_entry, rb_node);
	88
	89	cmp = strcmp(he->map->dso->name, iter->map->dso->name);
	90	if (cmp > 0)
	91	p = &(*p)->rb_left;
	92	else if (cmp < 0)
	93	p = &(*p)->rb_right;
	94	else {
	95	cmp = strcmp(he->sym->name, iter->sym->name);
	96	if (cmp > 0)
	97	p = &(*p)->rb_left;
	98	else
	99	p = &(*p)->rb_right;
	100	}
	101	}
	102
	103	rb_link_node(&he->rb_node, parent, p);
	104	rb_insert_color(&he->rb_node, root);
	105	}
	106
	107	static void perf_session__resort_by_name(struct perf_session *self)
	108	{
	109	unsigned long position = 1;
	110	struct rb_root tmp = RB_ROOT;
	111	struct rb_node *next = rb_first(&self->hists);
	112
	113	while (next != NULL) {
	114	struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
	115
	116	next = rb_next(&n->rb_node);
	117	rb_erase(&n->rb_node, &self->hists);
	118	n->position = position++;
	119	perf_session__insert_hist_entry_by_name(&tmp, n);
	120	}
121
122	self->hists = tmp;
123	}
124
125	static struct hist_entry *
126	perf_session__find_hist_entry_by_name(struct perf_session *self,
127	struct hist_entry *he)
128	{
129	struct rb_node *n = self->hists.rb_node;
130
131	while (n) {
132	struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
133	int cmp = strcmp(he->map->dso->name, iter->map->dso->name);
134
135	if (cmp > 0)
136	n = n->rb_left;
137	else if (cmp < 0)
138	n = n->rb_right;
139	else {
140	cmp = strcmp(he->sym->name, iter->sym->name);
141	if (cmp > 0)
142	n = n->rb_left;
143	else if (cmp < 0)
144	n = n->rb_right;
145	else
146	return iter;
147	}
148	}
149
150	return NULL;
151	}
152
153	static void perf_session__match_hists(struct perf_session *old_session,
154	struct perf_session *new_session)
155	{
156	struct rb_node *nd;
157
158	perf_session__resort_by_name(old_session);
159
160	for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) {
161	struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
162	pos->pair = perf_session__find_hist_entry_by_name(old_session, pos);
163	}
164	}
165
86a9eee0 ACM	166	static int __cmd_diff(void)
	167	{
	168	int ret, i;
	169	struct perf_session *session[2];
	170
75be6cf4 ACM	171	session[0] = perf_session__new(input_old, O_RDONLY, force);
75be6cf4 ACM	172	session[1] = perf_session__new(input_new, O_RDONLY, force);
86a9eee0 ACM	173	if (session[0] == NULL \|\| session[1] == NULL)
	174	return -ENOMEM;
	175
	176	for (i = 0; i < 2; ++i) {
	177	ret = perf_session__process_events(session[i], &event_ops);
	178	if (ret)
	179	goto out_delete;
	180	perf_session__output_resort(session[i], session[i]->events_stats.total);
	181	}
	182
	183	perf_session__match_hists(session[0], session[1]);
c351c281 ACM	184	perf_session__fprintf_hists(session[1], session[0],
c351c281 ACM	185	show_displacement, stdout);
86a9eee0 ACM	186	out_delete:
	187	for (i = 0; i < 2; ++i)
	188	perf_session__delete(session[i]);
	189	return ret;
	190	}
	191
0422a4fc	192	static const char * const diff_usage[] = {
86a9eee0	193	"perf diff [<options>] [old_file] [new_file]",
0422a4fc	194	NULL,
86a9eee0 ACM	195	};
	196
	197	static const struct option options[] = {
	198	OPT_BOOLEAN('v', "verbose", &verbose,
	199	"be more verbose (show symbol address, etc)"),
c351c281 ACM	200	OPT_BOOLEAN('m', "displacement", &show_displacement,
c351c281 ACM	201	"Show position displacement relative to baseline"),
86a9eee0 ACM	202	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
	203	"dump raw trace in ASCII"),
	204	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
	205	OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
	206	"load module symbols - WARNING: use only with -k and LIVE kernel"),
f7d87444	207	OPT_BOOLEAN('P', "full-paths", &symbol_conf.full_paths,
86a9eee0	208	"Don't shorten the pathnames taking into account the cwd"),
c410a338 ACM	209	OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
	210	"only consider symbols in these dsos"),
	211	OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
	212	"only consider symbols in these comms"),
	213	OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
	214	"only consider these symbols"),
c351c281 ACM	215	OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
	216	"sort by key(s): pid, comm, dso, symbol, parent"),
	217	OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
	218	"separator for columns, no spaces will be added between "
	219	"columns '.' is reserved."),
86a9eee0 ACM	220	OPT_END()
	221	};
	222
	223	int cmd_diff(int argc, const char *argv, const char prefix __used)
	224	{
604c5c92	225	sort_order = diff__default_sort_order;
86a9eee0 ACM	226	argc = parse_options(argc, argv, options, diff_usage, 0);
	227	if (argc) {
	228	if (argc > 2)
	229	usage_with_options(diff_usage, options);
	230	if (argc == 2) {
	231	input_old = argv[0];
	232	input_new = argv[1];
	233	} else
	234	input_new = argv[0];
	235	}
	236
c351c281	237	symbol_conf.exclude_other = false;
655000e7 ACM	238	if (symbol__init() < 0)
	239	return -1;
	240
	241	setup_sorting(diff_usage, options);
86a9eee0	242	setup_pager();
c351c281 ACM	243
	244	sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
	245	sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
	246	sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
	247
86a9eee0 ACM	248	return __cmd_diff();
86a9eee0 ACM	249	}