[deliverable/linux.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/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 bool show_baseline_only;
static bool sort_compute;

enum {
	COMPUTE_DELTA,
	COMPUTE_RATIO,
	COMPUTE_MAX,
};

const char *compute_names[COMPUTE_MAX] = {
	[COMPUTE_DELTA] = "delta",
	[COMPUTE_RATIO] = "ratio",
};

static int compute;

static int setup_compute(const struct option *opt, const char *str,
			 int unset __maybe_unused)
{
	int *cp = (int *) opt->value;
	unsigned i;

	if (!str) {
		*cp = COMPUTE_DELTA;
		return 0;
	}

	if (*str == '+') {
		sort_compute = true;
		str++;
		if (!*str)
			return 0;
	}

	for (i = 0; i < COMPUTE_MAX; i++)
		if (!strcmp(str, compute_names[i])) {
			*cp = i;
			return 0;
		}

	pr_err("Failed: '%s' is not computation method "
	       "(use 'delta' or 'ratio').\n", str);
	return -EINVAL;
}

static double get_period_percent(struct hist_entry *he, u64 period)
{
	u64 total = he->hists->stats.total_period;
	return (period * 100.0) / total;
}

double perf_diff__compute_delta(struct hist_entry *he)
{
	struct hist_entry *pair = he->pair;
	double new_percent = get_period_percent(he, he->stat.period);
	double old_percent = pair ? get_period_percent(pair, pair->stat.period) : 0.0;

	he->diff.period_ratio_delta = new_percent - old_percent;
	he->diff.computed = true;
	return he->diff.period_ratio_delta;
}

double perf_diff__compute_ratio(struct hist_entry *he)
{
	struct hist_entry *pair = he->pair;
	double new_period = he->stat.period;
	double old_period = pair ? pair->stat.period : 0;

	he->diff.computed = true;
	he->diff.period_ratio = pair ? (new_period / old_period) : 0;
	return he->diff.period_ratio;
}

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 void hists__baseline_only(struct hists *hists)
{
	struct rb_node *next = rb_first(&hists->entries);

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

		next = rb_next(&he->rb_node);
		if (!he->pair) {
			rb_erase(&he->rb_node, &hists->entries);
			hist_entry__free(he);
		}
	}
}

static void hists__precompute(struct hists *hists)
{
	struct rb_node *next = rb_first(&hists->entries);

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

		next = rb_next(&he->rb_node);

		switch (compute) {
		case COMPUTE_DELTA:
			perf_diff__compute_delta(he);
			break;
		case COMPUTE_RATIO:
			perf_diff__compute_ratio(he);
			break;
		default:
			BUG_ON(1);
		}
	}
}

static int64_t cmp_doubles(double l, double r)
{
	if (l > r)
		return -1;
	else if (l < r)
		return 1;
	else
		return 0;
}

static int64_t
hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
			int c)
{
	switch (c) {
	case COMPUTE_DELTA:
	{
		double l = left->diff.period_ratio_delta;
		double r = right->diff.period_ratio_delta;

		return cmp_doubles(l, r);
	}
	case COMPUTE_RATIO:
	{
		double l = left->diff.period_ratio;
		double r = right->diff.period_ratio;

		return cmp_doubles(l, r);
	}
	default:
		BUG_ON(1);
	}

	return 0;
}

static void insert_hist_entry_by_compute(struct rb_root *root,
					 struct hist_entry *he,
					 int c)
{
	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_compute(he, iter, c) < 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__compute_resort(struct hists *hists)
{
	struct rb_root tmp = RB_ROOT;
	struct rb_node *next = rb_first(&hists->entries);

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

		next = rb_next(&he->rb_node);

		rb_erase(&he->rb_node, &hists->entries);
		insert_hist_entry_by_compute(&tmp, he, compute);
	}

	hists->entries = tmp;
}

static void hists__process(struct hists *old, struct hists *new)
{
	hists__match(old, new);

	if (show_baseline_only)
		hists__baseline_only(new);

	if (sort_compute) {
		hists__precompute(new);
		hists__compute_resort(new);
	}

	hists__fprintf(new, true, 0, 0, stdout);
}

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__process(&evsel_old->hists, &evsel->hists);
	}

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('b', "baseline-only", &show_baseline_only,
		    "Show only items with match in baseline"),
	OPT_CALLBACK('c', "compute", &compute, "delta,ratio (default delta)",
		     "Entries differential computation selection",
		     setup_compute),
	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()
};

static void ui_init(void)
{
	perf_hpp__init();

	/* No overhead column. */
	perf_hpp__column_enable(PERF_HPP__OVERHEAD, false);

	/* Display baseline/delta/ratio/displacement columns. */
	perf_hpp__column_enable(PERF_HPP__BASELINE, true);

	switch (compute) {
	case COMPUTE_DELTA:
		perf_hpp__column_enable(PERF_HPP__DELTA, true);
		break;
	case COMPUTE_RATIO:
		perf_hpp__column_enable(PERF_HPP__RATIO, true);
		break;
	default:
		BUG_ON(1);
	};

	if (show_displacement)
		perf_hpp__column_enable(PERF_HPP__DISPL, true);
}

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;

	ui_init();

	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"
743eb868	12	#include "util/evsel.h"
863e451f	13	#include "util/evlist.h"
86a9eee0	14	#include "util/session.h"
45694aa7	15	#include "util/tool.h"
86a9eee0 ACM	16	#include "util/sort.h"
	17	#include "util/symbol.h"
	18	#include "util/util.h"
	19
	20	#include <stdlib.h>
	21
c351c281 ACM	22	static char const *input_old = "perf.data.old",
c351c281 ACM	23	*input_new = "perf.data";
604c5c92	24	static char diff__default_sort_order[] = "dso,symbol";
c0555642	25	static bool force;
c351c281	26	static bool show_displacement;
a06d143e	27	static bool show_baseline_only;
96c47f19	28	static bool sort_compute;
86a9eee0	29
7aaf6b35 JO	30	enum {
	31	COMPUTE_DELTA,
	32	COMPUTE_RATIO,
	33	COMPUTE_MAX,
	34	};
	35
	36	const char *compute_names[COMPUTE_MAX] = {
	37	[COMPUTE_DELTA] = "delta",
	38	[COMPUTE_RATIO] = "ratio",
	39	};
	40
	41	static int compute;
	42
	43	static int setup_compute(const struct option opt, const char str,
	44	int unset __maybe_unused)
	45	{
	46	int cp = (int ) opt->value;
	47	unsigned i;
	48
	49	if (!str) {
	50	*cp = COMPUTE_DELTA;
	51	return 0;
	52	}
	53
96c47f19 JO	54	if (*str == '+') {
	55	sort_compute = true;
	56	str++;
	57	if (!*str)
	58	return 0;
	59	}
	60
7aaf6b35 JO	61	for (i = 0; i < COMPUTE_MAX; i++)
	62	if (!strcmp(str, compute_names[i])) {
	63	*cp = i;
	64	return 0;
	65	}
	66
	67	pr_err("Failed: '%s' is not computation method "
	68	"(use 'delta' or 'ratio').\n", str);
	69	return -EINVAL;
	70	}
	71
96c47f19 JO	72	static double get_period_percent(struct hist_entry *he, u64 period)
	73	{
	74	u64 total = he->hists->stats.total_period;
	75	return (period * 100.0) / total;
	76	}
	77
	78	double perf_diff__compute_delta(struct hist_entry *he)
	79	{
	80	struct hist_entry *pair = he->pair;
	81	double new_percent = get_period_percent(he, he->stat.period);
	82	double old_percent = pair ? get_period_percent(pair, pair->stat.period) : 0.0;
	83
	84	he->diff.period_ratio_delta = new_percent - old_percent;
	85	he->diff.computed = true;
	86	return he->diff.period_ratio_delta;
	87	}
	88
	89	double perf_diff__compute_ratio(struct hist_entry *he)
	90	{
	91	struct hist_entry *pair = he->pair;
	92	double new_period = he->stat.period;
	93	double old_period = pair ? pair->stat.period : 0;
	94
	95	he->diff.computed = true;
	96	he->diff.period_ratio = pair ? (new_period / old_period) : 0;
	97	return he->diff.period_ratio;
	98	}
	99
1c02c4d2	100	static int hists__add_entry(struct hists *self,
c82ee828	101	struct addr_location *al, u64 period)
86a9eee0	102	{
c82ee828	103	if (__hists__add_entry(self, al, NULL, period) != NULL)
28e2a106 ACM	104	return 0;
28e2a106 ACM	105	return -ENOMEM;
86a9eee0 ACM	106	}
86a9eee0 ACM	107
1d037ca1	108	static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
d20deb64	109	union perf_event *event,
8d50e5b4	110	struct perf_sample *sample,
863e451f	111	struct perf_evsel *evsel,
743eb868	112	struct machine *machine)
86a9eee0 ACM	113	{
86a9eee0 ACM	114	struct addr_location al;
86a9eee0	115
743eb868	116	if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) {
86a9eee0 ACM	117	pr_warning("problem processing %d event, skipping it.\n",
	118	event->header.type);
	119	return -1;
	120	}
	121
cdbae314	122	if (al.filtered \|\| al.sym == NULL)
c410a338 ACM	123	return 0;
c410a338 ACM	124
863e451f	125	if (hists__add_entry(&evsel->hists, &al, sample->period)) {
c82ee828	126	pr_warning("problem incrementing symbol period, skipping event\n");
86a9eee0 ACM	127	return -1;
	128	}
	129
863e451f	130	evsel->hists.stats.total_period += sample->period;
86a9eee0 ACM	131	return 0;
	132	}
	133
863e451f JO	134	static struct perf_tool tool = {
	135	.sample = diff__process_sample_event,
	136	.mmap = perf_event__process_mmap,
	137	.comm = perf_event__process_comm,
	138	.exit = perf_event__process_task,
	139	.fork = perf_event__process_task,
	140	.lost = perf_event__process_lost,
	141	.ordered_samples = true,
	142	.ordering_requires_timestamps = true,
86a9eee0 ACM	143	};
86a9eee0 ACM	144
dd464345 JO	145	static void insert_hist_entry_by_name(struct rb_root *root,
dd464345 JO	146	struct hist_entry *he)
86a9eee0 ACM	147	{
	148	struct rb_node **p = &root->rb_node;
	149	struct rb_node *parent = NULL;
	150	struct hist_entry *iter;
	151
	152	while (*p != NULL) {
86a9eee0 ACM	153	parent = *p;
86a9eee0 ACM	154	iter = rb_entry(parent, struct hist_entry, rb_node);
9c443dfd	155	if (hist_entry__cmp(he, iter) < 0)
86a9eee0	156	p = &(*p)->rb_left;
9c443dfd	157	else
86a9eee0	158	p = &(*p)->rb_right;
86a9eee0 ACM	159	}
	160
	161	rb_link_node(&he->rb_node, parent, p);
	162	rb_insert_color(&he->rb_node, root);
	163	}
	164
dd464345	165	static void hists__name_resort(struct hists *self, bool sort)
86a9eee0 ACM	166	{
	167	unsigned long position = 1;
	168	struct rb_root tmp = RB_ROOT;
1c02c4d2	169	struct rb_node *next = rb_first(&self->entries);
86a9eee0 ACM	170
	171	while (next != NULL) {
	172	struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
	173
	174	next = rb_next(&n->rb_node);
86a9eee0	175	n->position = position++;
dd464345 JO	176
	177	if (sort) {
	178	rb_erase(&n->rb_node, &self->entries);
	179	insert_hist_entry_by_name(&tmp, n);
	180	}
86a9eee0 ACM	181	}
86a9eee0 ACM	182
dd464345 JO	183	if (sort)
dd464345 JO	184	self->entries = tmp;
86a9eee0 ACM	185	}
86a9eee0 ACM	186
1c02c4d2 ACM	187	static struct hist_entry hists__find_entry(struct hists self,
1c02c4d2 ACM	188	struct hist_entry *he)
86a9eee0	189	{
1c02c4d2	190	struct rb_node *n = self->entries.rb_node;
86a9eee0 ACM	191
	192	while (n) {
	193	struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
9c443dfd	194	int64_t cmp = hist_entry__cmp(he, iter);
86a9eee0	195
9c443dfd	196	if (cmp < 0)
86a9eee0	197	n = n->rb_left;
9c443dfd	198	else if (cmp > 0)
86a9eee0	199	n = n->rb_right;
dd464345	200	else
9c443dfd	201	return iter;
86a9eee0 ACM	202	}
	203
	204	return NULL;
	205	}
	206
1c02c4d2	207	static void hists__match(struct hists older, struct hists newer)
86a9eee0 ACM	208	{
	209	struct rb_node *nd;
	210
1c02c4d2	211	for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) {
86a9eee0	212	struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
1c02c4d2	213	pos->pair = hists__find_entry(older, pos);
86a9eee0 ACM	214	}
	215	}
	216
863e451f JO	217	static struct perf_evsel evsel_match(struct perf_evsel evsel,
	218	struct perf_evlist *evlist)
	219	{
	220	struct perf_evsel *e;
	221
	222	list_for_each_entry(e, &evlist->entries, node)
	223	if (perf_evsel__match2(evsel, e))
	224	return e;
	225
	226	return NULL;
	227	}
	228
dd464345 JO	229	static void perf_evlist__resort_hists(struct perf_evlist *evlist, bool name)
	230	{
	231	struct perf_evsel *evsel;
	232
	233	list_for_each_entry(evsel, &evlist->entries, node) {
	234	struct hists *hists = &evsel->hists;
	235
	236	hists__output_resort(hists);
	237
	238	/*
	239	* The hists__name_resort only sets possition
	240	* if name is false.
	241	*/
	242	if (name \|\| ((!name) && show_displacement))
	243	hists__name_resort(hists, name);
	244	}
	245	}
	246
a06d143e JO	247	static void hists__baseline_only(struct hists *hists)
	248	{
	249	struct rb_node *next = rb_first(&hists->entries);
	250
	251	while (next != NULL) {
	252	struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node);
	253
	254	next = rb_next(&he->rb_node);
	255	if (!he->pair) {
	256	rb_erase(&he->rb_node, &hists->entries);
	257	hist_entry__free(he);
	258	}
	259	}
	260	}
	261
96c47f19 JO	262	static void hists__precompute(struct hists *hists)
	263	{
	264	struct rb_node *next = rb_first(&hists->entries);
	265
	266	while (next != NULL) {
	267	struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node);
	268
	269	next = rb_next(&he->rb_node);
	270
	271	switch (compute) {
	272	case COMPUTE_DELTA:
	273	perf_diff__compute_delta(he);
	274	break;
	275	case COMPUTE_RATIO:
	276	perf_diff__compute_ratio(he);
	277	break;
	278	default:
	279	BUG_ON(1);
	280	}
	281	}
	282	}
	283
	284	static int64_t cmp_doubles(double l, double r)
	285	{
	286	if (l > r)
	287	return -1;
	288	else if (l < r)
	289	return 1;
	290	else
	291	return 0;
	292	}
	293
	294	static int64_t
	295	hist_entry__cmp_compute(struct hist_entry left, struct hist_entry right,
	296	int c)
	297	{
	298	switch (c) {
	299	case COMPUTE_DELTA:
	300	{
	301	double l = left->diff.period_ratio_delta;
	302	double r = right->diff.period_ratio_delta;
	303
	304	return cmp_doubles(l, r);
	305	}
	306	case COMPUTE_RATIO:
	307	{
	308	double l = left->diff.period_ratio;
	309	double r = right->diff.period_ratio;
	310
	311	return cmp_doubles(l, r);
	312	}
	313	default:
	314	BUG_ON(1);
	315	}
	316
	317	return 0;
	318	}
	319
	320	static void insert_hist_entry_by_compute(struct rb_root *root,
	321	struct hist_entry *he,
	322	int c)
	323	{
	324	struct rb_node **p = &root->rb_node;
	325	struct rb_node *parent = NULL;
326	struct hist_entry *iter;
327
328	while (*p != NULL) {
329	parent = *p;
330	iter = rb_entry(parent, struct hist_entry, rb_node);
331	if (hist_entry__cmp_compute(he, iter, c) < 0)
332	p = &(*p)->rb_left;
333	else
334	p = &(*p)->rb_right;
335	}
336
337	rb_link_node(&he->rb_node, parent, p);
338	rb_insert_color(&he->rb_node, root);
339	}
340
341	static void hists__compute_resort(struct hists *hists)
342	{
343	struct rb_root tmp = RB_ROOT;
344	struct rb_node *next = rb_first(&hists->entries);
345
346	while (next != NULL) {
347	struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node);
348
349	next = rb_next(&he->rb_node);
350
351	rb_erase(&he->rb_node, &hists->entries);
352	insert_hist_entry_by_compute(&tmp, he, compute);
353	}
354
355	hists->entries = tmp;
356	}
357
a06d143e JO	358	static void hists__process(struct hists old, struct hists new)
	359	{
	360	hists__match(old, new);
	361
	362	if (show_baseline_only)
	363	hists__baseline_only(new);
	364
96c47f19 JO	365	if (sort_compute) {
	366	hists__precompute(new);
	367	hists__compute_resort(new);
	368	}
	369
a06d143e JO	370	hists__fprintf(new, true, 0, 0, stdout);
	371	}
	372
86a9eee0 ACM	373	static int __cmd_diff(void)
	374	{
	375	int ret, i;
4bf9ce1b JO	376	#define older (session[0])
4bf9ce1b JO	377	#define newer (session[1])
86a9eee0	378	struct perf_session *session[2];
863e451f JO	379	struct perf_evlist evlist_new, evlist_old;
	380	struct perf_evsel *evsel;
	381	bool first = true;
86a9eee0	382
4bf9ce1b	383	older = perf_session__new(input_old, O_RDONLY, force, false,
863e451f	384	&tool);
4bf9ce1b	385	newer = perf_session__new(input_new, O_RDONLY, force, false,
863e451f	386	&tool);
86a9eee0 ACM	387	if (session[0] == NULL \|\| session[1] == NULL)
	388	return -ENOMEM;
	389
	390	for (i = 0; i < 2; ++i) {
863e451f	391	ret = perf_session__process_events(session[i], &tool);
86a9eee0 ACM	392	if (ret)
86a9eee0 ACM	393	goto out_delete;
86a9eee0 ACM	394	}
86a9eee0 ACM	395
863e451f JO	396	evlist_old = older->evlist;
	397	evlist_new = newer->evlist;
	398
dd464345 JO	399	perf_evlist__resort_hists(evlist_old, true);
dd464345 JO	400	perf_evlist__resort_hists(evlist_new, false);
863e451f JO	401
	402	list_for_each_entry(evsel, &evlist_new->entries, node) {
	403	struct perf_evsel *evsel_old;
	404
	405	evsel_old = evsel_match(evsel, evlist_old);
	406	if (!evsel_old)
	407	continue;
	408
	409	fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
	410	perf_evsel__name(evsel));
	411
	412	first = false;
	413
a06d143e	414	hists__process(&evsel_old->hists, &evsel->hists);
863e451f	415	}
9c443dfd	416
86a9eee0 ACM	417	out_delete:
	418	for (i = 0; i < 2; ++i)
	419	perf_session__delete(session[i]);
	420	return ret;
4bf9ce1b JO	421	#undef older
4bf9ce1b JO	422	#undef newer
86a9eee0 ACM	423	}
86a9eee0 ACM	424
0422a4fc	425	static const char * const diff_usage[] = {
86a9eee0	426	"perf diff [<options>] [old_file] [new_file]",
0422a4fc	427	NULL,
86a9eee0 ACM	428	};
	429
	430	static const struct option options[] = {
c0555642	431	OPT_INCR('v', "verbose", &verbose,
86a9eee0	432	"be more verbose (show symbol address, etc)"),
34295559	433	OPT_BOOLEAN('M', "displacement", &show_displacement,
c351c281	434	"Show position displacement relative to baseline"),
a06d143e JO	435	OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
a06d143e JO	436	"Show only items with match in baseline"),
7aaf6b35 JO	437	OPT_CALLBACK('c', "compute", &compute, "delta,ratio (default delta)",
	438	"Entries differential computation selection",
	439	setup_compute),
86a9eee0 ACM	440	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
	441	"dump raw trace in ASCII"),
	442	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
	443	OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
	444	"load module symbols - WARNING: use only with -k and LIVE kernel"),
c410a338 ACM	445	OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
	446	"only consider symbols in these dsos"),
	447	OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
	448	"only consider symbols in these comms"),
	449	OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
	450	"only consider these symbols"),
c351c281 ACM	451	OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
	452	"sort by key(s): pid, comm, dso, symbol, parent"),
	453	OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
	454	"separator for columns, no spaces will be added between "
	455	"columns '.' is reserved."),
ec5761ea DA	456	OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
ec5761ea DA	457	"Look for files with symbols relative to this directory"),
86a9eee0 ACM	458	OPT_END()
	459	};
	460
1d77822e JO	461	static void ui_init(void)
	462	{
	463	perf_hpp__init();
	464
	465	/* No overhead column. */
	466	perf_hpp__column_enable(PERF_HPP__OVERHEAD, false);
	467
7aaf6b35	468	/* Display baseline/delta/ratio/displacement columns. */
1d77822e	469	perf_hpp__column_enable(PERF_HPP__BASELINE, true);
7aaf6b35 JO	470
	471	switch (compute) {
	472	case COMPUTE_DELTA:
	473	perf_hpp__column_enable(PERF_HPP__DELTA, true);
	474	break;
	475	case COMPUTE_RATIO:
	476	perf_hpp__column_enable(PERF_HPP__RATIO, true);
	477	break;
	478	default:
	479	BUG_ON(1);
	480	};
1d77822e JO	481
	482	if (show_displacement)
	483	perf_hpp__column_enable(PERF_HPP__DISPL, true);
	484	}
	485
1d037ca1	486	int cmd_diff(int argc, const char *argv, const char prefix __maybe_unused)
86a9eee0	487	{
604c5c92	488	sort_order = diff__default_sort_order;
86a9eee0 ACM	489	argc = parse_options(argc, argv, options, diff_usage, 0);
	490	if (argc) {
	491	if (argc > 2)
	492	usage_with_options(diff_usage, options);
	493	if (argc == 2) {
	494	input_old = argv[0];
	495	input_new = argv[1];
	496	} else
	497	input_new = argv[0];
a1645ce1 ZY	498	} else if (symbol_conf.default_guest_vmlinux_name \|\|
	499	symbol_conf.default_guest_kallsyms) {
	500	input_old = "perf.data.host";
	501	input_new = "perf.data.guest";
86a9eee0 ACM	502	}
86a9eee0 ACM	503
c351c281	504	symbol_conf.exclude_other = false;
655000e7 ACM	505	if (symbol__init() < 0)
	506	return -1;
	507
1d77822e JO	508	ui_init();
1d77822e JO	509
655000e7	510	setup_sorting(diff_usage, options);
86a9eee0	511	setup_pager();
c351c281 ACM	512
	513	sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
	514	sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
	515	sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
	516
86a9eee0 ACM	517	return __cmd_diff();
86a9eee0 ACM	518	}