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/session.h" 14 #include "util/tool.h" 15 #include "util/sort.h" 16 #include "util/symbol.h" 17 #include "util/util.h" 18 19 #include <stdlib.h> 20 21 static char const *input_old = "perf.data.old", 22 *input_new = "perf.data"; 23 static char diff__default_sort_order[] = "dso,symbol"; 24 static bool force; 25 static bool show_displacement; 26 27 static int hists__add_entry(struct hists *self, 28 struct addr_location *al, u64 period) 29 { 30 if (__hists__add_entry(self, al, NULL, period) != NULL) 31 return 0; 32 return -ENOMEM; 33 } 34 35 static int diff__process_sample_event(struct perf_tool *tool __used, 36 union perf_event *event, 37 struct perf_sample *sample, 38 struct perf_evsel *evsel __used, 39 struct machine *machine) 40 { 41 struct addr_location al; 42 43 if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) { 44 pr_warning("problem processing %d event, skipping it.\n", 45 event->header.type); 46 return -1; 47 } 48 49 if (al.filtered || al.sym == NULL) 50 return 0; 51 52 if (hists__add_entry(&evsel->hists, &al, sample->period)) { 53 pr_warning("problem incrementing symbol period, skipping event\n"); 54 return -1; 55 } 56 57 evsel->hists.stats.total_period += sample->period; 58 return 0; 59 } 60 61 static struct perf_tool perf_diff = { 62 .sample = diff__process_sample_event, 63 .mmap = perf_event__process_mmap, 64 .comm = perf_event__process_comm, 65 .exit = perf_event__process_task, 66 .fork = perf_event__process_task, 67 .lost = perf_event__process_lost, 68 .ordered_samples = true, 69 .ordering_requires_timestamps = true, 70 }; 71 72 static void perf_session__insert_hist_entry_by_name(struct rb_root *root, 73 struct hist_entry *he) 74 { 75 struct rb_node **p = &root->rb_node; 76 struct rb_node *parent = NULL; 77 struct hist_entry *iter; 78 79 while (*p != NULL) { 80 parent = *p; 81 iter = rb_entry(parent, struct hist_entry, rb_node); 82 if (hist_entry__cmp(he, iter) < 0) 83 p = &(*p)->rb_left; 84 else 85 p = &(*p)->rb_right; 86 } 87 88 rb_link_node(&he->rb_node, parent, p); 89 rb_insert_color(&he->rb_node, root); 90 } 91 92 static void hists__resort_entries(struct hists *self) 93 { 94 unsigned long position = 1; 95 struct rb_root tmp = RB_ROOT; 96 struct rb_node *next = rb_first(&self->entries); 97 98 while (next != NULL) { 99 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node); 100 101 next = rb_next(&n->rb_node); 102 rb_erase(&n->rb_node, &self->entries); 103 n->position = position++; 104 perf_session__insert_hist_entry_by_name(&tmp, n); 105 } 106 107 self->entries = tmp; 108 } 109 110 static void hists__set_positions(struct hists *self) 111 { 112 hists__output_resort(self); 113 hists__resort_entries(self); 114 } 115 116 static struct hist_entry *hists__find_entry(struct hists *self, 117 struct hist_entry *he) 118 { 119 struct rb_node *n = self->entries.rb_node; 120 121 while (n) { 122 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node); 123 int64_t cmp = hist_entry__cmp(he, iter); 124 125 if (cmp < 0) 126 n = n->rb_left; 127 else if (cmp > 0) 128 n = n->rb_right; 129 else 130 return iter; 131 } 132 133 return NULL; 134 } 135 136 static void hists__match(struct hists *older, struct hists *newer) 137 { 138 struct rb_node *nd; 139 140 for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) { 141 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node); 142 pos->pair = hists__find_entry(older, pos); 143 } 144 } 145 146 static int __cmd_diff(void) 147 { 148 int ret, i; 149 struct perf_session *session[2]; 150 151 session[0] = perf_session__new(input_old, O_RDONLY, force, false, &perf_diff); 152 session[1] = perf_session__new(input_new, O_RDONLY, force, false, &perf_diff); 153 if (session[0] == NULL || session[1] == NULL) 154 return -ENOMEM; 155 156 for (i = 0; i < 2; ++i) { 157 ret = perf_session__process_events(session[i], &perf_diff); 158 if (ret) 159 goto out_delete; 160 } 161 162 hists__output_resort(&session[1]->hists); 163 if (show_displacement) 164 hists__set_positions(&session[0]->hists); 165 166 hists__match(&session[0]->hists, &session[1]->hists); 167 hists__fprintf(&session[1]->hists, &session[0]->hists, 168 show_displacement, true, 0, 0, stdout); 169 out_delete: 170 for (i = 0; i < 2; ++i) 171 perf_session__delete(session[i]); 172 return ret; 173 } 174 175 static const char * const diff_usage[] = { 176 "perf diff [<options>] [old_file] [new_file]", 177 NULL, 178 }; 179 180 static const struct option options[] = { 181 OPT_INCR('v', "verbose", &verbose, 182 "be more verbose (show symbol address, etc)"), 183 OPT_BOOLEAN('M', "displacement", &show_displacement, 184 "Show position displacement relative to baseline"), 185 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, 186 "dump raw trace in ASCII"), 187 OPT_BOOLEAN('f', "force", &force, "don't complain, do it"), 188 OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules, 189 "load module symbols - WARNING: use only with -k and LIVE kernel"), 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_STRING(0, "symfs", &symbol_conf.symfs, "directory", 202 "Look for files with symbols relative to this directory"), 203 OPT_END() 204 }; 205 206 int cmd_diff(int argc, const char **argv, const char *prefix __used) 207 { 208 sort_order = diff__default_sort_order; 209 argc = parse_options(argc, argv, options, diff_usage, 0); 210 if (argc) { 211 if (argc > 2) 212 usage_with_options(diff_usage, options); 213 if (argc == 2) { 214 input_old = argv[0]; 215 input_new = argv[1]; 216 } else 217 input_new = argv[0]; 218 } else if (symbol_conf.default_guest_vmlinux_name || 219 symbol_conf.default_guest_kallsyms) { 220 input_old = "perf.data.host"; 221 input_new = "perf.data.guest"; 222 } 223 224 symbol_conf.exclude_other = false; 225 if (symbol__init() < 0) 226 return -1; 227 228 setup_sorting(diff_usage, options); 229 setup_pager(); 230 231 sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL); 232 sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL); 233 sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL); 234 235 return __cmd_diff(); 236 } 237