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