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: %p\n", event->header.misc, 46 event->ip.pid, (void *)(long)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) 55 return 0; 56 57 event__parse_sample(event, session->sample_type, &data); 58 59 if (al.sym && 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 .process_sample_event = diff__process_sample_event, 70 .process_mmap_event = event__process_mmap, 71 .process_comm_event = event__process_comm, 72 .process_exit_event = event__process_task, 73 .process_fork_event = event__process_task, 74 .process_lost_event = 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 int cmp; 86 parent = *p; 87 iter = rb_entry(parent, struct hist_entry, rb_node); 88 89 cmp = strcmp(he->map->dso->name, iter->map->dso->name); 90 if (cmp > 0) 91 p = &(*p)->rb_left; 92 else if (cmp < 0) 93 p = &(*p)->rb_right; 94 else { 95 cmp = strcmp(he->sym->name, iter->sym->name); 96 if (cmp > 0) 97 p = &(*p)->rb_left; 98 else 99 p = &(*p)->rb_right; 100 } 101 } 102 103 rb_link_node(&he->rb_node, parent, p); 104 rb_insert_color(&he->rb_node, root); 105 } 106 107 static void perf_session__resort_by_name(struct perf_session *self) 108 { 109 unsigned long position = 1; 110 struct rb_root tmp = RB_ROOT; 111 struct rb_node *next = rb_first(&self->hists); 112 113 while (next != NULL) { 114 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node); 115 116 next = rb_next(&n->rb_node); 117 rb_erase(&n->rb_node, &self->hists); 118 n->position = position++; 119 perf_session__insert_hist_entry_by_name(&tmp, n); 120 } 121 122 self->hists = tmp; 123 } 124 125 static struct hist_entry * 126 perf_session__find_hist_entry_by_name(struct perf_session *self, 127 struct hist_entry *he) 128 { 129 struct rb_node *n = self->hists.rb_node; 130 131 while (n) { 132 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node); 133 int cmp = strcmp(he->map->dso->name, iter->map->dso->name); 134 135 if (cmp > 0) 136 n = n->rb_left; 137 else if (cmp < 0) 138 n = n->rb_right; 139 else { 140 cmp = strcmp(he->sym->name, iter->sym->name); 141 if (cmp > 0) 142 n = n->rb_left; 143 else if (cmp < 0) 144 n = n->rb_right; 145 else 146 return iter; 147 } 148 } 149 150 return NULL; 151 } 152 153 static void perf_session__match_hists(struct perf_session *old_session, 154 struct perf_session *new_session) 155 { 156 struct rb_node *nd; 157 158 perf_session__resort_by_name(old_session); 159 160 for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) { 161 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node); 162 pos->pair = perf_session__find_hist_entry_by_name(old_session, pos); 163 } 164 } 165 166 static int __cmd_diff(void) 167 { 168 int ret, i; 169 struct perf_session *session[2]; 170 171 session[0] = perf_session__new(input_old, O_RDONLY, force); 172 session[1] = perf_session__new(input_new, O_RDONLY, force); 173 if (session[0] == NULL || session[1] == NULL) 174 return -ENOMEM; 175 176 for (i = 0; i < 2; ++i) { 177 ret = perf_session__process_events(session[i], &event_ops); 178 if (ret) 179 goto out_delete; 180 perf_session__output_resort(session[i], session[i]->events_stats.total); 181 } 182 183 perf_session__match_hists(session[0], session[1]); 184 perf_session__fprintf_hists(session[1], session[0], 185 show_displacement, stdout); 186 out_delete: 187 for (i = 0; i < 2; ++i) 188 perf_session__delete(session[i]); 189 return ret; 190 } 191 192 static const char * const diff_usage[] = { 193 "perf diff [<options>] [old_file] [new_file]", 194 NULL, 195 }; 196 197 static const struct option options[] = { 198 OPT_BOOLEAN('v', "verbose", &verbose, 199 "be more verbose (show symbol address, etc)"), 200 OPT_BOOLEAN('m', "displacement", &show_displacement, 201 "Show position displacement relative to baseline"), 202 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, 203 "dump raw trace in ASCII"), 204 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"), 205 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules, 206 "load module symbols - WARNING: use only with -k and LIVE kernel"), 207 OPT_BOOLEAN('P', "full-paths", &event_ops.full_paths, 208 "Don't shorten the pathnames taking into account the cwd"), 209 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]", 210 "only consider symbols in these dsos"), 211 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]", 212 "only consider symbols in these comms"), 213 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]", 214 "only consider these symbols"), 215 OPT_STRING('s', "sort", &sort_order, "key[,key2...]", 216 "sort by key(s): pid, comm, dso, symbol, parent"), 217 OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator", 218 "separator for columns, no spaces will be added between " 219 "columns '.' is reserved."), 220 OPT_END() 221 }; 222 223 int cmd_diff(int argc, const char **argv, const char *prefix __used) 224 { 225 sort_order = diff__default_sort_order; 226 argc = parse_options(argc, argv, options, diff_usage, 0); 227 if (argc) { 228 if (argc > 2) 229 usage_with_options(diff_usage, options); 230 if (argc == 2) { 231 input_old = argv[0]; 232 input_new = argv[1]; 233 } else 234 input_new = argv[0]; 235 } 236 237 symbol_conf.exclude_other = false; 238 if (symbol__init() < 0) 239 return -1; 240 241 setup_sorting(diff_usage, options); 242 setup_pager(); 243 244 sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL); 245 sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL); 246 sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL); 247 248 return __cmd_diff(); 249 } 250