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/evsel.h" 13 #include "util/evlist.h" 14 #include "util/session.h" 15 #include "util/tool.h" 16 #include "util/sort.h" 17 #include "util/symbol.h" 18 #include "util/util.h" 19 20 #include <stdlib.h> 21 22 static char const *input_old = "perf.data.old", 23 *input_new = "perf.data"; 24 static char diff__default_sort_order[] = "dso,symbol"; 25 static bool force; 26 static bool show_displacement; 27 28 static int hists__add_entry(struct hists *self, 29 struct addr_location *al, u64 period) 30 { 31 if (__hists__add_entry(self, al, NULL, period) != NULL) 32 return 0; 33 return -ENOMEM; 34 } 35 36 static int diff__process_sample_event(struct perf_tool *tool __maybe_unused, 37 union perf_event *event, 38 struct perf_sample *sample, 39 struct perf_evsel *evsel, 40 struct machine *machine) 41 { 42 struct addr_location al; 43 44 if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) { 45 pr_warning("problem processing %d event, skipping it.\n", 46 event->header.type); 47 return -1; 48 } 49 50 if (al.filtered || al.sym == NULL) 51 return 0; 52 53 if (hists__add_entry(&evsel->hists, &al, sample->period)) { 54 pr_warning("problem incrementing symbol period, skipping event\n"); 55 return -1; 56 } 57 58 evsel->hists.stats.total_period += sample->period; 59 return 0; 60 } 61 62 static struct perf_tool tool = { 63 .sample = diff__process_sample_event, 64 .mmap = perf_event__process_mmap, 65 .comm = perf_event__process_comm, 66 .exit = perf_event__process_task, 67 .fork = perf_event__process_task, 68 .lost = perf_event__process_lost, 69 .ordered_samples = true, 70 .ordering_requires_timestamps = true, 71 }; 72 73 static void perf_session__insert_hist_entry_by_name(struct rb_root *root, 74 struct hist_entry *he) 75 { 76 struct rb_node **p = &root->rb_node; 77 struct rb_node *parent = NULL; 78 struct hist_entry *iter; 79 80 while (*p != NULL) { 81 parent = *p; 82 iter = rb_entry(parent, struct hist_entry, rb_node); 83 if (hist_entry__cmp(he, iter) < 0) 84 p = &(*p)->rb_left; 85 else 86 p = &(*p)->rb_right; 87 } 88 89 rb_link_node(&he->rb_node, parent, p); 90 rb_insert_color(&he->rb_node, root); 91 } 92 93 static void hists__resort_entries(struct hists *self) 94 { 95 unsigned long position = 1; 96 struct rb_root tmp = RB_ROOT; 97 struct rb_node *next = rb_first(&self->entries); 98 99 while (next != NULL) { 100 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node); 101 102 next = rb_next(&n->rb_node); 103 rb_erase(&n->rb_node, &self->entries); 104 n->position = position++; 105 perf_session__insert_hist_entry_by_name(&tmp, n); 106 } 107 108 self->entries = tmp; 109 } 110 111 static struct hist_entry *hists__find_entry(struct hists *self, 112 struct hist_entry *he) 113 { 114 struct rb_node *n = self->entries.rb_node; 115 116 while (n) { 117 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node); 118 int64_t cmp = hist_entry__cmp(he, iter); 119 120 if (cmp < 0) 121 n = n->rb_left; 122 else if (cmp > 0) 123 n = n->rb_right; 124 else 125 return iter; 126 } 127 128 return NULL; 129 } 130 131 static void hists__match(struct hists *older, struct hists *newer) 132 { 133 struct rb_node *nd; 134 135 for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) { 136 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node); 137 pos->pair = hists__find_entry(older, pos); 138 } 139 } 140 141 static struct perf_evsel *evsel_match(struct perf_evsel *evsel, 142 struct perf_evlist *evlist) 143 { 144 struct perf_evsel *e; 145 146 list_for_each_entry(e, &evlist->entries, node) 147 if (perf_evsel__match2(evsel, e)) 148 return e; 149 150 return NULL; 151 } 152 153 static int __cmd_diff(void) 154 { 155 int ret, i; 156 #define older (session[0]) 157 #define newer (session[1]) 158 struct perf_session *session[2]; 159 struct perf_evlist *evlist_new, *evlist_old; 160 struct perf_evsel *evsel; 161 bool first = true; 162 163 older = perf_session__new(input_old, O_RDONLY, force, false, 164 &tool); 165 newer = perf_session__new(input_new, O_RDONLY, force, false, 166 &tool); 167 if (session[0] == NULL || session[1] == NULL) 168 return -ENOMEM; 169 170 for (i = 0; i < 2; ++i) { 171 ret = perf_session__process_events(session[i], &tool); 172 if (ret) 173 goto out_delete; 174 } 175 176 evlist_old = older->evlist; 177 evlist_new = newer->evlist; 178 179 list_for_each_entry(evsel, &evlist_new->entries, node) 180 hists__output_resort(&evsel->hists); 181 182 list_for_each_entry(evsel, &evlist_old->entries, node) { 183 hists__output_resort(&evsel->hists); 184 185 if (show_displacement) 186 hists__resort_entries(&evsel->hists); 187 } 188 189 list_for_each_entry(evsel, &evlist_new->entries, node) { 190 struct perf_evsel *evsel_old; 191 192 evsel_old = evsel_match(evsel, evlist_old); 193 if (!evsel_old) 194 continue; 195 196 fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n", 197 perf_evsel__name(evsel)); 198 199 first = false; 200 201 hists__match(&evsel_old->hists, &evsel->hists); 202 hists__fprintf(&evsel->hists, &evsel_old->hists, 203 show_displacement, true, 0, 0, stdout); 204 } 205 206 out_delete: 207 for (i = 0; i < 2; ++i) 208 perf_session__delete(session[i]); 209 return ret; 210 #undef older 211 #undef newer 212 } 213 214 static const char * const diff_usage[] = { 215 "perf diff [<options>] [old_file] [new_file]", 216 NULL, 217 }; 218 219 static const struct option options[] = { 220 OPT_INCR('v', "verbose", &verbose, 221 "be more verbose (show symbol address, etc)"), 222 OPT_BOOLEAN('M', "displacement", &show_displacement, 223 "Show position displacement relative to baseline"), 224 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, 225 "dump raw trace in ASCII"), 226 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"), 227 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules, 228 "load module symbols - WARNING: use only with -k and LIVE kernel"), 229 OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]", 230 "only consider symbols in these dsos"), 231 OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]", 232 "only consider symbols in these comms"), 233 OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]", 234 "only consider these symbols"), 235 OPT_STRING('s', "sort", &sort_order, "key[,key2...]", 236 "sort by key(s): pid, comm, dso, symbol, parent"), 237 OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator", 238 "separator for columns, no spaces will be added between " 239 "columns '.' is reserved."), 240 OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory", 241 "Look for files with symbols relative to this directory"), 242 OPT_END() 243 }; 244 245 int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused) 246 { 247 sort_order = diff__default_sort_order; 248 argc = parse_options(argc, argv, options, diff_usage, 0); 249 if (argc) { 250 if (argc > 2) 251 usage_with_options(diff_usage, options); 252 if (argc == 2) { 253 input_old = argv[0]; 254 input_new = argv[1]; 255 } else 256 input_new = argv[0]; 257 } else if (symbol_conf.default_guest_vmlinux_name || 258 symbol_conf.default_guest_kallsyms) { 259 input_old = "perf.data.host"; 260 input_new = "perf.data.guest"; 261 } 262 263 symbol_conf.exclude_other = false; 264 if (symbol__init() < 0) 265 return -1; 266 267 perf_hpp__init(true, show_displacement); 268 setup_sorting(diff_usage, options); 269 setup_pager(); 270 271 sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL); 272 sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL); 273 sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL); 274 275 return __cmd_diff(); 276 } 277