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