path: root/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>
#include <math.h>

/* 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__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;
	const char		*file;
	int			 idx;
	struct hists		*hists;
	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 char diff__default_sort_order[] = "dso,symbol";
static bool force;
static bool show_period;
static bool show_formula;
static bool show_baseline_only;
static unsigned int sort_compute;

static s64 compute_wdiff_w1;
static s64 compute_wdiff_w2;

enum {
	COMPUTE_DELTA,
	COMPUTE_RATIO,
	COMPUTE_WEIGHTED_DIFF,
	COMPUTE_MAX,
};

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

static int compute;

static int compute_2_hpp[COMPUTE_MAX] = {
	[COMPUTE_DELTA]		= PERF_HPP_DIFF__DELTA,
	[COMPUTE_RATIO]		= PERF_HPP_DIFF__RATIO,
	[COMPUTE_WEIGHTED_DIFF]	= PERF_HPP_DIFF__WEIGHTED_DIFF,
};

#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__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,
	}
};

static int setup_compute_opt_wdiff(char *opt)
{
	char *w1_str = opt;
	char *w2_str;

	int ret = -EINVAL;

	if (!opt)
		goto out;

	w2_str = strchr(opt, ',');
	if (!w2_str)
		goto out;

	*w2_str++ = 0x0;
	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(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;
	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);