| /* |
| * 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 || al.sym == NULL) |
| return 0; |
| |
| event__parse_sample(event, session->sample_type, &data); |
| |
| if (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 = { |
| .sample = diff__process_sample_event, |
| .mmap = event__process_mmap, |
| .comm = event__process_comm, |
| .exit = event__process_task, |
| .fork = event__process_task, |
| .lost = 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) { |
| 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 perf_session__resort_hist_entries(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 void perf_session__set_hist_entries_positions(struct perf_session *self) |
| { |
| perf_session__output_resort(self, self->events_stats.total); |
| perf_session__resort_hist_entries(self); |
| } |
| |
| static struct hist_entry * |
| perf_session__find_hist_entry(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); |
| 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 perf_session__match_hists(struct perf_session *old_session, |
| struct perf_session *new_session) |
| { |
| struct rb_node *nd; |
| |
| 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(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[1], session[1]->events_stats.total); |
| if (show_displacement) |
| perf_session__set_hist_entries_positions(session[0]); |
| |
| 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", &symbol_conf.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(); |
| } |