// SPDX-License-Identifier: GPL-2.0/* * 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 "perf.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/srcline.h"#include "util/symbol.h"#include "util/data.h"#include "util/config.h"#include "util/time-utils.h"#include "util/annotate.h"#include "util/map.h"#include "util/spark.h"#include "util/block-info.h"#include "util/stream.h"#include "util/util.h"#include <linux/err.h>#include <linux/zalloc.h>#include <subcmd/pager.h>#include <subcmd/parse-options.h> #include <errno.h>#include <inttypes.h>#include <stdlib.h>#include <math.h> struct perf_diff {	struct perf_tool		 tool;	const char			*time_str;	struct perf_time_interval	*ptime_range;	int				 range_size;	int				 range_num;	bool				 has_br_stack;	bool				 stream;}; /* Diff command specific HPP columns. */enum {	PERF_HPP_DIFF__BASELINE,	PERF_HPP_DIFF__PERIOD,	PERF_HPP_DIFF__PERIOD_BASELINE,	PERF_HPP_DIFF__DELTA,	PERF_HPP_DIFF__RATIO,	PERF_HPP_DIFF__WEIGHTED_DIFF,	PERF_HPP_DIFF__FORMULA,	PERF_HPP_DIFF__DELTA_ABS,	PERF_HPP_DIFF__CYCLES,	PERF_HPP_DIFF__CYCLES_HIST, 	PERF_HPP_DIFF__MAX_INDEX}; struct diff_hpp_fmt {	struct perf_hpp_fmt	 fmt;	int			 idx;	char			*header;	int			 header_width;}; struct data__file {	struct perf_session	*session;	struct perf_data	 data;	int			 idx;	struct hists		*hists;	struct evlist_streams	*evlist_streams;	struct diff_hpp_fmt	 fmt[PERF_HPP_DIFF__MAX_INDEX];}; static struct data__file *data__files;static int data__files_cnt; #define data__for_each_file_start(i, d, s)	\	for (i = s, d = &data__files[s];	\	     i < data__files_cnt;		\	     i++, d = &data__files[i]) #define data__for_each_file(i, d) data__for_each_file_start(i, d, 0)#define data__for_each_file_new(i, d) data__for_each_file_start(i, d, 1) static bool force;static bool show_period;static bool show_formula;static bool show_baseline_only;static bool cycles_hist;static unsigned int sort_compute = 1; static s64 compute_wdiff_w1;static s64 compute_wdiff_w2; static const char		*cpu_list;static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS); enum {	COMPUTE_DELTA,	COMPUTE_RATIO,	COMPUTE_WEIGHTED_DIFF,	COMPUTE_DELTA_ABS,	COMPUTE_CYCLES,	COMPUTE_MAX,	COMPUTE_STREAM,	/* After COMPUTE_MAX to avoid use current compute arrays */}; static const char *compute_names[COMPUTE_MAX] = {	[COMPUTE_DELTA] = "delta",	[COMPUTE_DELTA_ABS] = "delta-abs",	[COMPUTE_RATIO] = "ratio",	[COMPUTE_WEIGHTED_DIFF] = "wdiff",	[COMPUTE_CYCLES] = "cycles",}; static int compute = COMPUTE_DELTA_ABS; static int compute_2_hpp[COMPUTE_MAX] = {	[COMPUTE_DELTA]		= PERF_HPP_DIFF__DELTA,	[COMPUTE_DELTA_ABS]	= PERF_HPP_DIFF__DELTA_ABS,	[COMPUTE_RATIO]		= PERF_HPP_DIFF__RATIO,	[COMPUTE_WEIGHTED_DIFF]	= PERF_HPP_DIFF__WEIGHTED_DIFF,	[COMPUTE_CYCLES]	= PERF_HPP_DIFF__CYCLES,}; #define MAX_COL_WIDTH 70 static struct header_column {	const char *name;	int width;} columns[PERF_HPP_DIFF__MAX_INDEX] = {	[PERF_HPP_DIFF__BASELINE] = {		.name  = "Baseline",	},	[PERF_HPP_DIFF__PERIOD] = {		.name  = "Period",		.width = 14,	},	[PERF_HPP_DIFF__PERIOD_BASELINE] = {		.name  = "Base period",		.width = 14,	},	[PERF_HPP_DIFF__DELTA] = {		.name  = "Delta",		.width = 7,	},	[PERF_HPP_DIFF__DELTA_ABS] = {		.name  = "Delta Abs",		.width = 7,	},	[PERF_HPP_DIFF__RATIO] = {		.name  = "Ratio",		.width = 14,	},	[PERF_HPP_DIFF__WEIGHTED_DIFF] = {		.name  = "Weighted diff",		.width = 14,	},	[PERF_HPP_DIFF__FORMULA] = {		.name  = "Formula",		.width = MAX_COL_WIDTH,	},	[PERF_HPP_DIFF__CYCLES] = {		.name  = "[Program Block Range] Cycles Diff",		.width = 70,	},	[PERF_HPP_DIFF__CYCLES_HIST] = {		.name  = "stddev/Hist",		.width = NUM_SPARKS + 9,	}}; static int setup_compute_opt_wdiff(const char *opt){	const char *w1_str = opt, *w2_str; 	int ret = -EINVAL; 	if (!opt)		goto out; 	w2_str = strchr(opt, ',');	if (!w2_str)		goto out; 	if (!*++w2_str)		goto out; 	compute_wdiff_w1 = strtol(w1_str, NULL, 10);	compute_wdiff_w2 = strtol(w2_str, NULL, 10); 	if (!compute_wdiff_w1 || !compute_wdiff_w2)		goto out; 	pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",		  compute_wdiff_w1, compute_wdiff_w2); 	ret = 0;  out:	if (ret)		pr_err("Failed: wrong weight data, use 'wdiff:w1,w2'\n"); 	return ret;} static int setup_compute_opt(const char *opt){	if (compute == COMPUTE_WEIGHTED_DIFF)		return setup_compute_opt_wdiff(opt); 	if (opt) {		pr_err("Failed: extra option specified '%s'", opt);		return -EINVAL;	} 	return 0;} static int setup_compute(const struct option *opt, const char *str,			 int unset __maybe_unused){	int *cp = (int *) opt->value;	char *cstr = (char *) str;	char buf[50];	unsigned i;	const char *option; 	if (!str) {		*cp = COMPUTE_DELTA;		return 0;	} 	option = strchr(str, ':');	if (option) {		unsigned len = option++ - str; 		/*		 * The str data are not writeable, so we need		 * to use another buffer.		 */ 		/* No option value is longer. */		if (len >= sizeof(buf))			return -EINVAL; 		strncpy(buf, str, len);		buf[len] = 0x0;		cstr = buf;	} 	for (i = 0; i < COMPUTE_MAX; i++)		if (!strcmp(cstr, compute_names[i])) {			*cp = i;			return setup_compute_opt(option);		} 	pr_err("Failed: '%s' is not computation method "	       "(use 'delta','ratio' or 'wdiff')\n", str);	return -EINVAL;} static double period_percent(struct hist_entry *he, u64 period){	u64 total = hists__total_period(he->hists); 	return (period * 100.0) / total;} static double compute_delta(struct hist_entry *he, struct hist_entry *pair){	double old_percent = period_percent(he, he->stat.period);	double new_percent = period_percent(pair, pair->stat.period); 	pair->diff.period_ratio_delta = new_percent - old_percent;	pair->diff.computed = true;	return pair->diff.period_ratio_delta;} static double compute_ratio(struct hist_entry *he, struct hist_entry *pair){	double old_period = he->stat.period ?: 1;	double new_period = pair->stat.period; 	pair->diff.computed = true;	pair->diff.period_ratio = new_period / old_period;	return pair->diff.period_ratio;} static s64 compute_wdiff(struct hist_entry *he, struct hist_entry *pair){	u64 old_period = he->stat.period;	u64 new_period = pair->stat.period; 	pair->diff.computed = true;	pair->diff.wdiff = new_period * compute_wdiff_w2 -			   old_period * compute_wdiff_w1; 	return pair->diff.wdiff;} static int formula_delta(struct hist_entry *he, struct hist_entry *pair,			 char *buf, size_t size){	u64 he_total = he->hists->stats.total_period;	u64 pair_total = pair->hists->stats.total_period; 	if (symbol_conf.filter_relative) {		he_total = he->hists->stats.total_non_filtered_period;		pair_total = pair->hists->stats.total_non_filtered_period;	}	return scnprintf(buf, size,			 "(%" PRIu64 " * 100 / %" PRIu64 ") - "			 "(%" PRIu64 " * 100 / %" PRIu64 ")",			 pair->stat.period, pair_total,			 he->stat.period, he_total);} static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,			 char *buf, size_t size){	double old_period = he->stat.period;	double new_period = pair->stat.period; 	return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);} static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,			 char *buf, size_t size){	u64 old_period = he->stat.period;	u64 new_period = pair->stat.period; 	return scnprintf(buf, size,		  "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",		  new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);} static int formula_fprintf(struct hist_entry *he, struct hist_entry *pair,			   char *buf, size_t size){	switch (compute) {	case COMPUTE_DELTA:	case COMPUTE_DELTA_ABS:		return formula_delta(he, pair, buf, size);	case COMPUTE_RATIO:		return formula_ratio(he, pair, buf, size);	case COMPUTE_WEIGHTED_DIFF:		return formula_wdiff(he, pair, buf, size);	default:		BUG_ON(1);	} 	return -1;} static void *block_hist_zalloc(size_t size){	struct block_hist *bh; 	bh = zalloc(size + sizeof(*bh));	if (!bh)		return NULL; 	return &bh->he;} static void block_hist_free(void *he){	struct block_hist *bh; 	bh = container_of(he, struct block_hist, he);	hists__delete_entries(&bh->block_hists);	free(bh);} static struct hist_entry_ops block_hist_ops = {	.new    = block_hist_zalloc,	.free   = block_hist_free,}; static int diff__process_sample_event(const struct perf_tool *tool,				      union perf_event *event,				      struct perf_sample *sample,				      struct machine *machine){	struct perf_diff *pdiff = container_of(tool, struct perf_diff, tool);	struct addr_location al;	struct evsel *evsel = sample->evsel;	struct hists *hists = evsel__hists(evsel);	struct hist_entry_iter iter = {		.sample	= sample,		.ops	= &hist_iter_normal,	};	int ret = -1; 	if (perf_time__ranges_skip_sample(pdiff->ptime_range, pdiff->range_num,					  sample->time)) {		return 0;	} 	addr_location__init(&al);	if (machine__resolve(machine, &al, sample) < 0) {		pr_warning("problem processing %s (%u) event at offset %#" PRIx64 ", skipping it.\n",			   perf_event__name(event->header.type), event->header.type,			   sample->file_offset);		ret = -1;		goto out;	} 	if (cpu_list && (sample->cpu >= MAX_NR_CPUS ||			!test_bit(sample->cpu, cpu_bitmap))) {		ret = 0;		goto out;	} 	switch (compute) {	case COMPUTE_CYCLES:		if (!hists__add_entry_ops(hists, &block_hist_ops, &al, NULL,					  NULL, NULL, NULL, sample, true)) {			pr_warning("problem incrementing symbol period, "				   "skipping event\n");			goto out;		} 		hist__account_cycles(sample->branch_stack, &al, sample,				     /*nonany_branch_mode=*/false, /*total_cycles=*/NULL);		break; 	case COMPUTE_STREAM:		if (hist_entry_iter__add(&iter, &al, PERF_MAX_STACK_DEPTH,					 NULL)) {			pr_debug("problem adding hist entry at offset %#" PRIx64 ", skipping event\n",				 sample->file_offset);			goto out;		}		break; 	default:		if (!hists__add_entry(hists, &al, NULL, NULL, NULL, NULL, sample,				      true)) {			pr_warning("problem incrementing symbol period, "				   "skipping event\n");			goto out;		}	} 	/*	 * The total_period is updated here before going to the output	 * tree since normally only the baseline hists will call	 * hists__output_resort() and precompute needs the total	 * period in order to sort entries by percentage delta.	 */	hists->stats.total_period += sample->period;	if (!al.filtered)		hists->stats.total_non_filtered_period += sample->period;	ret = 0;out:	addr_location__exit(&al);	return ret;} static struct perf_diff pdiff; static struct evsel *evsel_match(struct evsel *evsel, struct evlist *evlist){	struct evsel *e; 	evlist__for_each_entry(evlist, e) {		if ((evsel->core.attr.type == e->core.attr.type) &&		    (evsel->core.attr.config == e->core.attr.config))			return e;	} 	return NULL;} static void evlist__collapse_resort(struct evlist *evlist){	struct evsel *evsel; 	evlist__for_each_entry(evlist, evsel) {		struct hists *hists = evsel__hists(evsel); 		hists__collapse_resort(hists, NULL);	}} static struct data__file *fmt_to_data_file(struct perf_hpp_fmt *fmt){	struct diff_hpp_fmt *dfmt = container_of(fmt, struct diff_hpp_fmt, fmt);	void *ptr = dfmt - dfmt->idx;

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