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