/* * 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/session.h" #include "util/sort.h" #include "util/symbol.h" #include "util/util.h" #include 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(struct perf_event_ops *ops __used, union perf_event *event, struct perf_sample *sample, struct perf_evsel *evsel __used, 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_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 [] [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(); }