summaryrefslogtreecommitdiffstats
path: root/tools/perf/builtin-diff.c
blob: 5cb577a3c5b2d0604a32f22d71972cfd3cb680ea (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
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
/*
 * 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/evsel.h"
#include "util/evlist.h"
#include "util/session.h"
#include "util/tool.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 bool  force;
static bool show_displacement;

static int hists__add_entry(struct hists *self,
			    struct addr_location *al, u64 period)
{
	if (__hists__add_entry(self, al, NULL, period) != NULL)
		return 0;
	return -ENOMEM;
}

static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
				      union perf_event *event,
				      struct perf_sample *sample,
				      struct perf_evsel *evsel,
				      struct machine *machine)
{
	struct addr_location al;

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

	if (al.filtered || al.sym == NULL)
		return 0;

	if (hists__add_entry(&evsel->hists, &al, sample->period)) {
		pr_warning("problem incrementing symbol period, skipping event\n");
		return -1;
	}

	evsel->hists.stats.total_period += sample->period;
	return 0;
}

static struct perf_tool tool = {
	.sample	= diff__process_sample_event,
	.mmap	= perf_event__process_mmap,
	.comm	= perf_event__process_comm,
	.exit	= perf_event__process_task,
	.fork	= perf_event__process_task,
	.lost	= perf_event__process_lost,
	.ordered_samples = true,
	.ordering_requires_timestamps = true,
};

static void 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) {
		parent = *p;
		iter = rb_entry(parent, struct hist_entry, rb_node);
		if (hist_entry__cmp(he, iter) < 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 hists__name_resort(struct hists *self, bool sort)
{
	unsigned long position = 1;
	struct rb_root tmp = RB_ROOT;
	struct rb_node *next = rb_first(&self->entries);

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

		next = rb_next(&n->rb_node);
		n->position = position++;

		if (sort) {
			rb_erase(&n->rb_node, &self->entries);
			insert_hist_entry_by_name(&tmp, n);
		}
	}

	if (sort)
		self->entries = tmp;
}

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

	while (n) {
		struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
		int64_t cmp = hist_entry__cmp(he, iter);

		if (cmp < 0)
			n = n->rb_left;
		else if (cmp > 0)
			n = n->rb_right;
		else
			return iter;
	}

	return NULL;
}

static void hists__match(struct hists *older, struct hists *newer)
{
	struct rb_node *nd;

	for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) {
		struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
		pos->pair = hists__find_entry(older, pos);
	}
}

static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
				      struct perf_evlist *evlist)
{
	struct perf_evsel *e;

	list_for_each_entry(e, &evlist->entries, node)
		if (perf_evsel__match2(evsel, e))
			return e;

	return NULL;
}

static void perf_evlist__resort_hists(struct perf_evlist *evlist, bool name)
{
	struct perf_evsel *evsel;

	list_for_each_entry(evsel, &evlist->entries, node) {
		struct hists *hists = &evsel->hists;

		hists__output_resort(hists);

		/*
		 * The hists__name_resort only sets possition
		 * if name is false.
		 */
		if (name || ((!name) && show_displacement))
			hists__name_resort(hists, name);
	}
}

static int __cmd_diff(void)
{
	int ret, i;
#define older (session[0])
#define newer (session[1])
	struct perf_session *session[2];
	struct perf_evlist *evlist_new, *evlist_old;
	struct perf_evsel *evsel;
	bool first = true;

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

	for (i = 0; i < 2; ++i) {
		ret = perf_session__process_events(session[i], &tool);
		if (ret)
			goto out_delete;
	}

	evlist_old = older->evlist;
	evlist_new = newer->evlist;

	perf_evlist__resort_hists(evlist_old, true);
	perf_evlist__resort_hists(evlist_new, false);

	list_for_each_entry(evsel, &evlist_new->entries, node) {
		struct perf_evsel *evsel_old;

		evsel_old = evsel_match(evsel, evlist_old);
		if (!evsel_old)
			continue;

		fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
			perf_evsel__name(evsel));

		first = false;

		hists__match(&evsel_old->hists, &evsel->hists);
		hists__fprintf(&evsel->hists, &evsel_old->hists,
			       true, 0, 0, stdout);
	}

out_delete:
	for (i = 0; i < 2; ++i)
		perf_session__delete(session[i]);
	return ret;
#undef older
#undef newer
}

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

static const struct option options[] = {
	OPT_INCR('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_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_STRING(0, "symfs", &symbol_conf.symfs, "directory",
		    "Look for files with symbols relative to this directory"),
	OPT_END()
};

int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
{
	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];
	} else if (symbol_conf.default_guest_vmlinux_name ||
		   symbol_conf.default_guest_kallsyms) {
		input_old = "perf.data.host";
		input_new = "perf.data.guest";
	}

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

	perf_hpp__init(true, show_displacement);
	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();
}
OpenPOWER on IntegriCloud