/* * 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 int force; static bool show_displacement; static int perf_session__add_hist_entry(struct perf_session *self, struct addr_location *al, u64 count) { bool hit; struct hist_entry *he = __perf_session__add_hist_entry(self, al, NULL, count, &hit); if (he == NULL) return -ENOMEM; if (hit) he->count += count; return 0; } static int diff__process_sample_event(event_t *event, struct perf_session *session) { struct addr_location al; struct sample_data data = { .period = 1, }; dump_printf("(IP, %d): %d: %p\n", event->header.misc, event->ip.pid, (void *)(long)event->ip.ip); if (event__preprocess_sample(event, session, &al, NULL) < 0) { pr_warning("problem processing %d event, skipping it.\n", event->header.type); return -1; } if (al.filtered) return 0; event__parse_sample(event, session->sample_type, &data); if (al.sym && perf_session__add_hist_entry(session, &al, data.period)) { pr_warning("problem incrementing symbol count, skipping event\n"); return -1; } session->events_stats.total += data.period; return 0; } static struct perf_event_ops event_ops = { .process_sample_event = diff__process_sample_event, .process_mmap_event = event__process_mmap, .process_comm_event = event__process_comm, .process_exit_event = event__process_task, .process_fork_event = event__process_task, .process_lost_event = event__process_lost, }; 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) { int cmp; parent = *p; iter = rb_entry(parent, struct hist_entry, rb_node); cmp = strcmp(he->map->dso->name, iter->map->dso->name); if (cmp > 0) p = &(*p)->rb_left; else if (cmp < 0) p = &(*p)->rb_right; else { cmp = strcmp(he->sym->name, iter->sym->name); if (cmp > 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 perf_session__resort_by_name(struct perf_session *self) { unsigned long position = 1; struct rb_root tmp = RB_ROOT; struct rb_node *next = rb_first(&self->hists); 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->hists); n->position = position++; perf_session__insert_hist_entry_by_name(&tmp, n); } self->hists = tmp; } static struct hist_entry * perf_session__find_hist_entry_by_name(struct perf_session *self, struct hist_entry *he) { struct rb_node *n = self->hists.rb_node; while (n) { struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node); int cmp = strcmp(he->map->dso->name, iter->map->dso->name); if (cmp > 0) n = n->rb_left; else if (cmp < 0) n = n->rb_right; else { cmp = strcmp(he->sym->name, iter->sym->name); if (cmp > 0) n = n->rb_left; else if (cmp < 0) n = n->rb_right; else return iter; } } return NULL; } static void perf_session__match_hists(struct perf_session *old_session, struct perf_session *new_session) { struct rb_node *nd; perf_session__resort_by_name(old_session); for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) { struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node); pos->pair = perf_session__find_hist_entry_by_name(old_session, pos); } } static int __cmd_diff(void) { int ret, i; struct perf_session *session[2]; session[0] = perf_session__new(input_old, O_RDONLY, force); session[1] = perf_session__new(input_new, O_RDONLY, force); 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; perf_session__output_resort(session[i], session[i]->events_stats.total); } perf_session__match_hists(session[0], session[1]); perf_session__fprintf_hists(session[1], session[0], show_displacement, 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_BOOLEAN('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_BOOLEAN('P', "full-paths", &event_ops.full_paths, "Don't shorten the pathnames taking into account the cwd"), 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_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]; } 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(); }