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