/* * 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> 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_period; static bool show_formula; static bool show_baseline_only; static bool 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 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; } if (*str == '+') { sort_compute = true; cstr = (char *) ++str; if (!*str) 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); } pr_err("Failed: '%s' is not computation method " "(use 'delta','ratio' or 'wdiff')\n", str); return -EINVAL; } double perf_diff__period_percent(struct hist_entry *he, u64 period) { u64 total = he->hists->stats.total_period; return (period * 100.0) / total; } double perf_diff__compute_delta(struct hist_entry *he, struct hist_entry *pair) { double new_percent = perf_diff__period_percent(he, he->stat.period); double old_percent = perf_diff__period_percent(pair, pair->stat.period); he->diff.period_ratio_delta = new_percent - old_percent; he->diff.computed = true; return he->diff.period_ratio_delta; } double perf_diff__compute_ratio(struct hist_entry *he, struct hist_entry *pair) { double new_period = he->stat.period; double old_period = pair->stat.period; he->diff.computed = true; he->diff.period_ratio = new_period / old_period; return he->diff.period_ratio; } s64 perf_diff__compute_wdiff(struct hist_entry *he, struct hist_entry *pair) { u64 new_period = he->stat.period; u64 old_period = pair->stat.period; he->diff.computed = true; he->diff.wdiff = new_period * compute_wdiff_w2 - old_period * compute_wdiff_w1; return he->diff.wdiff; } static int formula_delta(struct hist_entry *he, struct hist_entry *pair, char *buf, size_t size) { return scnprintf(buf, size, "(%" PRIu64 " * 100 / %" PRIu64 ") - " "(%" PRIu64 " * 100 / %" PRIu64 ")", he->stat.period, he->hists->stats.total_period, pair->stat.period, pair->hists->stats.total_period); } static int formula_ratio(struct hist_entry *he, struct hist_entry *pair, char *buf, size_t size) { double new_period = he->stat.period; double old_period = pair->stat.period; return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period); } static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair, char *buf, size_t size) { u64 new_period = he->stat.period; u64 old_period = pair->stat.period; return scnprintf(buf, size, "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")", new_period, compute_wdiff_w2, old_period, compute_wdiff_w1); } int perf_diff__formula(struct hist_entry *he, struct hist_entry *pair, char *buf, size_t size) { switch (compute) { case COMPUTE_DELTA: return formula_delta(he, pair, buf, size); case COMPUTE_RATIO: return formula_ratio(he, pair, buf, size); case COMPUTE_WEIGHTED_DIFF: return formula_wdiff(he, pair, buf, size); default: BUG_ON(1); } return -1; } 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_tool *tool __maybe_unused, union perf_event *event, struct perf_sample *sample, struct perf_evsel *evsel, 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) 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_tool tool = { .sample = diff__process_sample_event, .mmap = perf_event__process_mmap, .comm = perf_event__process_comm, .exit = perf_event__process_exit, .fork = perf_event__process_fork, .lost = perf_event__process_lost, .ordered_samples = true, .ordering_requires_timestamps = true, }; static struct perf_evsel *evsel_match(struct perf_evsel *evsel, struct perf_evlist *evlist) { struct perf_evsel *e; list_for_each_entry(e, &evlist->entries, node) if (perf_evsel__match2(evsel, e)) return e; return NULL; } static void perf_evlist__collapse_resort(struct perf_evlist *evlist) { struct perf_evsel *evsel; list_for_each_entry(evsel, &evlist->entries, node) { struct hists *hists = &evsel->hists; hists__collapse_resort(hists); } } static void hists__baseline_only(struct hists *hists) { struct rb_root *root; struct rb_node *next; if (sort__need_collapse) root = &hists->entries_collapsed; else root = hists->entries_in; next = rb_first(root); while (next != NULL) { struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node_in); next = rb_next(&he->rb_node_in); if (!hist_entry__next_pair(he)) { rb_erase(&he->rb_node_in, root); hist_entry__free(he); } } } static void hists__precompute(struct hists *hists) { struct rb_node *next = rb_first(&hists->entries); while (next != NULL) { struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node); struct hist_entry *pair = hist_entry__next_pair(he); next = rb_next(&he->rb_node); if (!pair) continue; switch (compute) { case COMPUTE_DELTA: perf_diff__compute_delta(he, pair); break; case COMPUTE_RATIO: perf_diff__compute_ratio(he, pair); break; case COMPUTE_WEIGHTED_DIFF: perf_diff__compute_wdiff(he, pair); break; default: BUG_ON(1); } } } static int64_t cmp_doubles(double l, double r) { if (l > r) return -1; else if (l < r) return 1; else return 0; } static int64_t hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right, int c) { switch (c) { case COMPUTE_DELTA: { double l = left->diff.period_ratio_delta; double r = right->diff.period_ratio_delta; return cmp_doubles(l, r); } case COMPUTE_RATIO: { double l = left->diff.period_ratio; double r = right->diff.period_ratio; return cmp_doubles(l, r); } case COMPUTE_WEIGHTED_DIFF: { s64 l = left->diff.wdiff; s64 r = right->diff.wdiff; return r - l; } default: BUG_ON(1); } return 0; } static void insert_hist_entry_by_compute(struct rb_root *root, struct hist_entry *he, int c) { 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_compute(he, iter, c) < 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__compute_resort(struct hists *hists) { struct rb_root *root; struct rb_node *next; if (sort__need_collapse) root = &hists->entries_collapsed; else root = hists->entries_in; hists->entries = RB_ROOT; next = rb_first(root); hists->nr_entries = 0; hists->stats.total_period = 0; hists__reset_col_len(hists); while (next != NULL) { struct hist_entry *he; he = rb_entry(next, struct hist_entry, rb_node_in); next = rb_next(&he->rb_node_in); insert_hist_entry_by_compute(&hists->entries, he, compute); hists__inc_nr_entries(hists, he); } } static void hists__process(struct hists *old, struct hists *new) { hists__match(new, old); if (show_baseline_only) hists__baseline_only(new); else hists__link(new, old); if (sort_compute) { hists__precompute(new); hists__compute_resort(new); } else { hists__output_resort(new); } hists__fprintf(new, true, 0, 0, stdout); } static int __cmd_diff(void) { int ret, i; #define older (session[0]) #define newer (session[1]) struct perf_session *session[2]; struct perf_evlist *evlist_new, *evlist_old; struct perf_evsel *evsel; bool first = true; older = perf_session__new(input_old, O_RDONLY, force, false, &tool); newer = perf_session__new(input_new, O_RDONLY, force, false, &tool); if (session[0] == NULL || session[1] == NULL) return -ENOMEM; for (i = 0; i < 2; ++i) { ret = perf_session__process_events(session[i], &tool); if (ret) goto out_delete; } evlist_old = older->evlist; evlist_new = newer->evlist; perf_evlist__collapse_resort(evlist_old); perf_evlist__collapse_resort(evlist_new); list_for_each_entry(evsel, &evlist_new->entries, node) { struct perf_evsel *evsel_old; evsel_old = evsel_match(evsel, evlist_old); if (!evsel_old) continue; fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n", perf_evsel__name(evsel)); first = false; hists__process(&evsel_old->hists, &evsel->hists); } out_delete: for (i = 0; i < 2; ++i) perf_session__delete(session[i]); return ret; #undef older #undef newer } 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('b', "baseline-only", &show_baseline_only, "Show only items with match in baseline"), OPT_CALLBACK('c', "compute", &compute, "delta,ratio,wdiff:w1,w2 (default delta)", "Entries differential computation selection", setup_compute), OPT_BOOLEAN('p', "period", &show_period, "Show period values."), OPT_BOOLEAN('F', "formula", &show_formula, "Show formula."), 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() }; static void ui_init(void) { /* * Display baseline/delta/ratio * formula/periods columns. */ perf_hpp__column_enable(PERF_HPP__BASELINE); switch (compute) { case COMPUTE_DELTA: perf_hpp__column_enable(PERF_HPP__DELTA); break; case COMPUTE_RATIO: perf_hpp__column_enable(PERF_HPP__RATIO); break; case COMPUTE_WEIGHTED_DIFF: perf_hpp__column_enable(PERF_HPP__WEIGHTED_DIFF); break; default: BUG_ON(1); }; if (show_formula) perf_hpp__column_enable(PERF_HPP__FORMULA); if (show_period) { perf_hpp__column_enable(PERF_HPP__PERIOD); perf_hpp__column_enable(PERF_HPP__PERIOD_BASELINE); } } int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused) { 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; ui_init(); if (setup_sorting() < 0) usage_with_options(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(); }