tools/perf/builtin-diff.c

   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/evlist.h"
  14 #include "util/session.h"
  15 #include "util/tool.h"
  16 #include "util/sort.h"
  17 #include "util/symbol.h"
  18 #include "util/util.h"
  19
  20 #include <stdlib.h>
  21
  22 static char const *input_old = "perf.data.old",
  23                   *input_new = "perf.data";
  24 static char       diff__default_sort_order[] = "dso,symbol";
  25 static bool  force;
  26 static bool show_displacement;
  27
  28 static int hists__add_entry(struct hists *self,
  29                             struct addr_location *al, u64 period)
  30 {
  31         if (__hists__add_entry(self, al, NULL, period) != NULL)
  32                 return 0;
  33         return -ENOMEM;
  34 }
  35
  36 static int diff__process_sample_event(struct perf_tool *tool __maybe_unused,
  37                                       union perf_event *event,
  38                                       struct perf_sample *sample,
  39                                       struct perf_evsel *evsel,
  40                                       struct machine *machine)
  41 {
  42         struct addr_location al;
  43
  44         if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) {
  45                 pr_warning("problem processing %d event, skipping it.\n",
  46                            event->header.type);
  47                 return -1;
  48         }
  49
  50         if (al.filtered || al.sym == NULL)
  51                 return 0;
  52
  53         if (hists__add_entry(&evsel->hists, &al, sample->period)) {
  54                 pr_warning("problem incrementing symbol period, skipping event\n");
  55                 return -1;
  56         }
  57
  58         evsel->hists.stats.total_period += sample->period;
  59         return 0;
  60 }
  61
  62 static struct perf_tool tool = {
  63         .sample = diff__process_sample_event,
  64         .mmap   = perf_event__process_mmap,
  65         .comm   = perf_event__process_comm,
  66         .exit   = perf_event__process_task,
  67         .fork   = perf_event__process_task,
  68         .lost   = perf_event__process_lost,
  69         .ordered_samples = true,
  70         .ordering_requires_timestamps = true,
  71 };
  72
  73 static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
  74                                                     struct hist_entry *he)
  75 {
  76         struct rb_node **p = &root->rb_node;
  77         struct rb_node *parent = NULL;
  78         struct hist_entry *iter;
  79
  80         while (*p != NULL) {
  81                 parent = *p;
  82                 iter = rb_entry(parent, struct hist_entry, rb_node);
  83                 if (hist_entry__cmp(he, iter) < 0)
  84                         p = &(*p)->rb_left;
  85                 else
  86                         p = &(*p)->rb_right;
  87         }
  88
  89         rb_link_node(&he->rb_node, parent, p);
  90         rb_insert_color(&he->rb_node, root);
  91 }
  92
  93 static void hists__resort_entries(struct hists *self)
  94 {
  95         unsigned long position = 1;
  96         struct rb_root tmp = RB_ROOT;
  97         struct rb_node *next = rb_first(&self->entries);
  98
  99         while (next != NULL) {
 100                 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
 101
 102                 next = rb_next(&n->rb_node);
 103                 rb_erase(&n->rb_node, &self->entries);
 104                 n->position = position++;
 105                 perf_session__insert_hist_entry_by_name(&tmp, n);
 106         }
 107
 108         self->entries = tmp;
 109 }
 110
 111 static struct hist_entry *hists__find_entry(struct hists *self,
 112                                             struct hist_entry *he)
 113 {
 114         struct rb_node *n = self->entries.rb_node;
 115
 116         while (n) {
 117                 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
 118                 int64_t cmp = hist_entry__cmp(he, iter);
 119
 120                 if (cmp < 0)
 121                         n = n->rb_left;
 122                 else if (cmp > 0)
 123                         n = n->rb_right;
 124                 else
 125                         return iter;
 126         }
 127
 128         return NULL;
 129 }
 130
 131 static void hists__match(struct hists *older, struct hists *newer)
 132 {
 133         struct rb_node *nd;
 134
 135         for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) {
 136                 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
 137                 pos->pair = hists__find_entry(older, pos);
 138         }
 139 }
 140
 141 static struct perf_evsel *evsel_match(struct perf_evsel *evsel,
 142                                       struct perf_evlist *evlist)
 143 {
 144         struct perf_evsel *e;
 145
 146         list_for_each_entry(e, &evlist->entries, node)
 147                 if (perf_evsel__match2(evsel, e))
 148                         return e;
 149
 150         return NULL;
 151 }
 152
 153 static int __cmd_diff(void)
 154 {
 155         int ret, i;
 156 #define older (session[0])
 157 #define newer (session[1])
 158         struct perf_session *session[2];
 159         struct perf_evlist *evlist_new, *evlist_old;
 160         struct perf_evsel *evsel;
 161         bool first = true;
 162
 163         older = perf_session__new(input_old, O_RDONLY, force, false,
 164                                   &tool);
 165         newer = perf_session__new(input_new, O_RDONLY, force, false,
 166                                   &tool);
 167         if (session[0] == NULL || session[1] == NULL)
 168                 return -ENOMEM;
 169
 170         for (i = 0; i < 2; ++i) {
 171                 ret = perf_session__process_events(session[i], &tool);
 172                 if (ret)
 173                         goto out_delete;
 174         }
 175
 176         evlist_old = older->evlist;
 177         evlist_new = newer->evlist;
 178
 179         list_for_each_entry(evsel, &evlist_new->entries, node)
 180                 hists__output_resort(&evsel->hists);
 181
 182         list_for_each_entry(evsel, &evlist_old->entries, node) {
 183                 hists__output_resort(&evsel->hists);
 184
 185                 if (show_displacement)
 186                         hists__resort_entries(&evsel->hists);
 187         }
 188
 189         list_for_each_entry(evsel, &evlist_new->entries, node) {
 190                 struct perf_evsel *evsel_old;
 191
 192                 evsel_old = evsel_match(evsel, evlist_old);
 193                 if (!evsel_old)
 194                         continue;
 195
 196                 fprintf(stdout, "%s# Event '%s'\n#\n", first ? "" : "\n",
 197                         perf_evsel__name(evsel));
 198
 199                 first = false;
 200
 201                 hists__match(&evsel_old->hists, &evsel->hists);
 202                 hists__fprintf(&evsel->hists, &evsel_old->hists,
 203                                show_displacement, true, 0, 0, stdout);
 204         }
 205
 206 out_delete:
 207         for (i = 0; i < 2; ++i)
 208                 perf_session__delete(session[i]);
 209         return ret;
 210 #undef older
 211 #undef newer
 212 }
 213
 214 static const char * const diff_usage[] = {
 215         "perf diff [<options>] [old_file] [new_file]",
 216         NULL,
 217 };
 218
 219 static const struct option options[] = {
 220         OPT_INCR('v', "verbose", &verbose,
 221                     "be more verbose (show symbol address, etc)"),
 222         OPT_BOOLEAN('M', "displacement", &show_displacement,
 223                     "Show position displacement relative to baseline"),
 224         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 225                     "dump raw trace in ASCII"),
 226         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 227         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 228                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 229         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 230                    "only consider symbols in these dsos"),
 231         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
 232                    "only consider symbols in these comms"),
 233         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 234                    "only consider these symbols"),
 235         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 236                    "sort by key(s): pid, comm, dso, symbol, parent"),
 237         OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
 238                    "separator for columns, no spaces will be added between "
 239                    "columns '.' is reserved."),
 240         OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
 241                     "Look for files with symbols relative to this directory"),
 242         OPT_END()
 243 };
 244
 245 int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
 246 {
 247         sort_order = diff__default_sort_order;
 248         argc = parse_options(argc, argv, options, diff_usage, 0);
 249         if (argc) {
 250                 if (argc > 2)
 251                         usage_with_options(diff_usage, options);
 252                 if (argc == 2) {
 253                         input_old = argv[0];
 254                         input_new = argv[1];
 255                 } else
 256                         input_new = argv[0];
 257         } else if (symbol_conf.default_guest_vmlinux_name ||
 258                    symbol_conf.default_guest_kallsyms) {
 259                 input_old = "perf.data.host";
 260                 input_new = "perf.data.guest";
 261         }
 262
 263         symbol_conf.exclude_other = false;
 264         if (symbol__init() < 0)
 265                 return -1;
 266
 267         perf_hpp__init(true, show_displacement);
 268         setup_sorting(diff_usage, options);
 269         setup_pager();
 270
 271         sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
 272         sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
 273         sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
 274
 275         return __cmd_diff();
 276 }