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->hists, 30 al, NULL, 31 count, &hit); 32 if (he == NULL) 33 return -ENOMEM; 34 35 if (hit) 36 he->count += count; 37 38 return 0; 39 } 40 41 static int diff__process_sample_event(event_t *event, struct perf_session *session) 42 { 43 struct addr_location al; 44 struct sample_data data = { .period = 1, }; 45 46 dump_printf("(IP, %d): %d: %#Lx\n", event->header.misc, 47 event->ip.pid, event->ip.ip); 48 49 if (event__preprocess_sample(event, session, &al, NULL) < 0) { 50 pr_warning("problem processing %d event, skipping it.\n", 51 event->header.type); 52 return -1; 53 } 54 55 if (al.filtered || al.sym == NULL) 56 return 0; 57 58 event__parse_sample(event, session->sample_type, &data); 59 60 if (perf_session__add_hist_entry(session, &al, data.period)) { 61 pr_warning("problem incrementing symbol count, skipping event\n"); 62 return -1; 63 } 64 65 session->events_stats.total += data.period; 66 return 0; 67 } 68 69 static struct perf_event_ops event_ops = { 70 .sample = diff__process_sample_event, 71 .mmap = event__process_mmap, 72 .comm = event__process_comm, 73 .exit = event__process_task, 74 .fork = event__process_task, 75 .lost = event__process_lost, 76 }; 77 78 static void perf_session__insert_hist_entry_by_name(struct rb_root *root, 79 struct hist_entry *he) 80 { 81 struct rb_node **p = &root->rb_node; 82 struct rb_node *parent = NULL; 83 struct hist_entry *iter; 84 85 while (*p != NULL) { 86 parent = *p; 87 iter = rb_entry(parent, struct hist_entry, rb_node); 88 if (hist_entry__cmp(he, iter) < 0) 89 p = &(*p)->rb_left; 90 else 91 p = &(*p)->rb_right; 92 } 93 94 rb_link_node(&he->rb_node, parent, p); 95 rb_insert_color(&he->rb_node, root); 96 } 97 98 static void perf_session__resort_hist_entries(struct perf_session *self) 99 { 100 unsigned long position = 1; 101 struct rb_root tmp = RB_ROOT; 102 struct rb_node *next = rb_first(&self->hists); 103 104 while (next != NULL) { 105 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node); 106 107 next = rb_next(&n->rb_node); 108 rb_erase(&n->rb_node, &self->hists); 109 n->position = position++; 110 perf_session__insert_hist_entry_by_name(&tmp, n); 111 } 112 113 self->hists = tmp; 114 } 115 116 static void perf_session__set_hist_entries_positions(struct perf_session *self) 117 { 118 perf_session__output_resort(&self->hists, self->events_stats.total); 119 perf_session__resort_hist_entries(self); 120 } 121 122 static struct hist_entry * 123 perf_session__find_hist_entry(struct perf_session *self, 124 struct hist_entry *he) 125 { 126 struct rb_node *n = self->hists.rb_node; 127 128 while (n) { 129 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node); 130 int64_t cmp = hist_entry__cmp(he, iter); 131 132 if (cmp < 0) 133 n = n->rb_left; 134 else if (cmp > 0) 135 n = n->rb_right; 136 else 137 return iter; 138 } 139 140 return NULL; 141 } 142 143 static void perf_session__match_hists(struct perf_session *old_session, 144 struct perf_session *new_session) 145 { 146 struct rb_node *nd; 147 148 for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) { 149 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node); 150 pos->pair = perf_session__find_hist_entry(old_session, pos); 151 } 152 } 153 154 static int __cmd_diff(void) 155 { 156 int ret, i; 157 struct perf_session *session[2]; 158 159 session[0] = perf_session__new(input_old, O_RDONLY, force); 160 session[1] = perf_session__new(input_new, O_RDONLY, force); 161 if (session[0] == NULL || session[1] == NULL) 162 return -ENOMEM; 163 164 for (i = 0; i < 2; ++i) { 165 ret = perf_session__process_events(session[i], &event_ops); 166 if (ret) 167 goto out_delete; 168 } 169 170 perf_session__output_resort(&session[1]->hists, 171 session[1]->events_stats.total); 172 if (show_displacement) 173 perf_session__set_hist_entries_positions(session[0]); 174 175 perf_session__match_hists(session[0], session[1]); 176 perf_session__fprintf_hists(&session[1]->hists, session[0], 177 show_displacement, stdout, 178 session[1]->events_stats.total); 179 out_delete: 180 for (i = 0; i < 2; ++i) 181 perf_session__delete(session[i]); 182 return ret; 183 } 184 185 static const char * const diff_usage[] = { 186 "perf diff [<options>] [old_file] [new_file]", 187 NULL, 188 }; 189 190 static const struct option options[] = { 191 OPT_BOOLEAN('v', "verbose", &verbose, 192 "be more verbose (show symbol address, etc)"), 193 OPT_BOOLEAN('m', "displacement", &show_displacement, 194 "Show position displacement relative to baseline"), 195 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, 196 "dump raw trace in ASCII"), 197 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"), 198 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules, 199 "load module symbols - WARNING: use only with -k and LIVE kernel"), 200 OPT_BOOLEAN('P', "full-paths", &symbol_conf.full_paths, 201 "Don't shorten the pathnames taking into account the cwd"), 202 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]", 203 "only consider symbols in these dsos"), 204 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]", 205 "only consider symbols in these comms"), 206 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]", 207 "only consider these symbols"), 208 OPT_STRING('s', "sort", &sort_order, "key[,key2...]", 209 "sort by key(s): pid, comm, dso, symbol, parent"), 210 OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator", 211 "separator for columns, no spaces will be added between " 212 "columns '.' is reserved."), 213 OPT_END() 214 }; 215 216 int cmd_diff(int argc, const char **argv, const char *prefix __used) 217 { 218 sort_order = diff__default_sort_order; 219 argc = parse_options(argc, argv, options, diff_usage, 0); 220 if (argc) { 221 if (argc > 2) 222 usage_with_options(diff_usage, options); 223 if (argc == 2) { 224 input_old = argv[0]; 225 input_new = argv[1]; 226 } else 227 input_new = argv[0]; 228 } 229 230 symbol_conf.exclude_other = false; 231 if (symbol__init() < 0) 232 return -1; 233 234 setup_sorting(diff_usage, options); 235 setup_pager(); 236 237 sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL); 238 sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL); 239 sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL); 240 241 return __cmd_diff(); 242 } 243