/* * 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 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(union perf_event *event,				      struct perf_sample *sample,				      struct perf_evsel *evsel __used,				      struct perf_session *session){	struct addr_location al; 	if (perf_event__preprocess_sample(event, session, &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(&session->hists, &al, sample->period)) {		pr_warning("problem incrementing symbol period, skipping event\n");		return -1;	} 	session->hists.stats.total_period += sample->period;	return 0;} static struct perf_event_ops event_ops = {	.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 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) {		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__resort_entries(struct hists *self){	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);		rb_erase(&n->rb_node, &self->entries);		n->position = position++;		perf_session__insert_hist_entry_by_name(&tmp, n);	} 	self->entries = tmp;} static void hists__set_positions(struct hists *self){	hists__output_resort(self);	hists__resort_entries(self);} 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 int __cmd_diff(void){	int ret, i;	struct perf_session *session[2]; 	session[0] = perf_session__new(input_old, O_RDONLY, force, false, &event_ops);	session[1] = perf_session__new(input_new, O_RDONLY, force, false, &event_ops);	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;	} 	hists__output_resort(&session[1]->hists);	if (show_displacement)		hists__set_positions(&session[0]->hists); 	hists__match(&session[0]->hists, &session[1]->hists);	hists__fprintf(&session[1]->hists, &session[0]->hists,		       show_displacement, true, 0, 0, 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_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 __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];	} 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; 	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();}