1 /* 2 * builtin-diff.c 3 * 4 * Builtin diff command: Analyze two perf.data input files, look up and read 5 * DSOs and symbol information, sort them and produce a diff. 6 */ 7 #include "builtin.h" 8 9 #include "util/debug.h" 10 #include "util/event.h" 11 #include "util/hist.h" 12 #include "util/session.h" 13 #include "util/sort.h" 14 #include "util/symbol.h" 15 #include "util/util.h" 16 17 #include <stdlib.h> 18 19 static char const *input_old = "perf.data.old", 20 *input_new = "perf.data"; 21 static char diff__default_sort_order[] = "dso,symbol"; 22 static int force; 23 static bool show_displacement; 24 25 static int perf_session__add_hist_entry(struct perf_session *self, 26 struct addr_location *al, u64 count) 27 { 28 bool hit; 29 struct hist_entry *he = __perf_session__add_hist_entry(self, al, NULL, 30 count, &hit); 31 if (he == NULL) 32 return -ENOMEM; 33 34 if (hit) 35 he->count += count; 36 37 return 0; 38 } 39 40 static int diff__process_sample_event(event_t *event, struct perf_session *session) 41 { 42 struct addr_location al; 43 struct sample_data data = { .period = 1, }; 44 45 dump_printf("(IP, %d): %d: %#Lx\n", event->header.misc, 46 event->ip.pid, event->ip.ip); 47 48 if (event__preprocess_sample(event, session, &al, NULL) < 0) { 49 pr_warning("problem processing %d event, skipping it.\n", 50 event->header.type); 51 return -1; 52 } 53 54 if (al.filtered || al.sym == NULL) 55 return 0; 56 57 event__parse_sample(event, session->sample_type, &data); 58 59 if (perf_session__add_hist_entry(session, &al, data.period)) { 60 pr_warning("problem incrementing symbol count, skipping event\n"); 61 return -1; 62 } 63 64 session->events_stats.total += data.period; 65 return 0; 66 } 67 68 static struct perf_event_ops event_ops = { 69 .sample = diff__process_sample_event, 70 .mmap = event__process_mmap, 71 .comm = event__process_comm, 72 .exit = event__process_task, 73 .fork = event__process_task, 74 .lost = event__process_lost, 75 }; 76 77 static void perf_session__insert_hist_entry_by_name(struct rb_root *root, 78 struct hist_entry *he) 79 { 80 struct rb_node **p = &root->rb_node; 81 struct rb_node *parent = NULL; 82 struct hist_entry *iter; 83 84 while (*p != NULL) { 85 parent = *p; 86 iter = rb_entry(parent, struct hist_entry, rb_node); 87 if (hist_entry__cmp(he, iter) < 0) 88 p = &(*p)->rb_left; 89 else 90 p = &(*p)->rb_right; 91 } 92 93 rb_link_node(&he->rb_node, parent, p); 94 rb_insert_color(&he->rb_node, root); 95 } 96 97 static void perf_session__resort_hist_entries(struct perf_session *self) 98 { 99 unsigned long position = 1; 100 struct rb_root tmp = RB_ROOT; 101 struct rb_node *next = rb_first(&self->hists); 102 103 while (next != NULL) { 104 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node); 105 106 next = rb_next(&n->rb_node); 107 rb_erase(&n->rb_node, &self->hists); 108 n->position = position++; 109 perf_session__insert_hist_entry_by_name(&tmp, n); 110 } 111 112 self->hists = tmp; 113 } 114 115 static void perf_session__set_hist_entries_positions(struct perf_session *self) 116 { 117 perf_session__output_resort(self, self->events_stats.total); 118 perf_session__resort_hist_entries(self); 119 } 120 121 static struct hist_entry * 122 perf_session__find_hist_entry(struct perf_session *self, 123 struct hist_entry *he) 124 { 125 struct rb_node *n = self->hists.rb_node; 126 127 while (n) { 128 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node); 129 int64_t cmp = hist_entry__cmp(he, iter); 130 131 if (cmp < 0) 132 n = n->rb_left; 133 else if (cmp > 0) 134 n = n->rb_right; 135 else 136 return iter; 137 } 138 139 return NULL; 140 } 141 142 static void perf_session__match_hists(struct perf_session *old_session, 143 struct perf_session *new_session) 144 { 145 struct rb_node *nd; 146 147 for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) { 148 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node); 149 pos->pair = perf_session__find_hist_entry(old_session, pos); 150 } 151 } 152 153 static int __cmd_diff(void) 154 { 155 int ret, i; 156 struct perf_session *session[2]; 157 158 session[0] = perf_session__new(input_old, O_RDONLY, force); 159 session[1] = perf_session__new(input_new, O_RDONLY, force); 160 if (session[0] == NULL || session[1] == NULL) 161 return -ENOMEM; 162 163 for (i = 0; i < 2; ++i) { 164 ret = perf_session__process_events(session[i], &event_ops); 165 if (ret) 166 goto out_delete; 167 } 168 169 perf_session__output_resort(session[1], session[1]->events_stats.total); 170 if (show_displacement) 171 perf_session__set_hist_entries_positions(session[0]); 172 173 perf_session__match_hists(session[0], session[1]); 174 perf_session__fprintf_hists(session[1], session[0], 175 show_displacement, stdout); 176 out_delete: 177 for (i = 0; i < 2; ++i) 178 perf_session__delete(session[i]); 179 return ret; 180 } 181 182 static const char * const diff_usage[] = { 183 "perf diff [<options>] [old_file] [new_file]", 184 NULL, 185 }; 186 187 static const struct option options[] = { 188 OPT_BOOLEAN('v', "verbose", &verbose, 189 "be more verbose (show symbol address, etc)"), 190 OPT_BOOLEAN('m', "displacement", &show_displacement, 191 "Show position displacement relative to baseline"), 192 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, 193 "dump raw trace in ASCII"), 194 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"), 195 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules, 196 "load module symbols - WARNING: use only with -k and LIVE kernel"), 197 OPT_BOOLEAN('P', "full-paths", &symbol_conf.full_paths, 198 "Don't shorten the pathnames taking into account the cwd"), 199 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]", 200 "only consider symbols in these dsos"), 201 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]", 202 "only consider symbols in these comms"), 203 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]", 204 "only consider these symbols"), 205 OPT_STRING('s', "sort", &sort_order, "key[,key2...]", 206 "sort by key(s): pid, comm, dso, symbol, parent"), 207 OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator", 208 "separator for columns, no spaces will be added between " 209 "columns '.' is reserved."), 210 OPT_END() 211 }; 212 213 int cmd_diff(int argc, const char **argv, const char *prefix __used) 214 { 215 sort_order = diff__default_sort_order; 216 argc = parse_options(argc, argv, options, diff_usage, 0); 217 if (argc) { 218 if (argc > 2) 219 usage_with_options(diff_usage, options); 220 if (argc == 2) { 221 input_old = argv[0]; 222 input_new = argv[1]; 223 } else 224 input_new = argv[0]; 225 } 226 227 symbol_conf.exclude_other = false; 228 if (symbol__init() < 0) 229 return -1; 230 231 setup_sorting(diff_usage, options); 232 setup_pager(); 233 234 sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL); 235 sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL); 236 sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL); 237 238 return __cmd_diff(); 239 } 240