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   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 int  force;
  23 static bool show_displacement;
  24
  25 static int perf_session__add_hist_entry(struct perf_session *self,
  26                                         struct addr_location *al, u64 count)
  27 {
  28         bool hit;
  29         struct hist_entry *he = __perf_session__add_hist_entry(self, al, NULL,
  30                                                                count, &hit);
  31         if (he == NULL)
  32                 return -ENOMEM;
  33
  34         if (hit)
  35                 he->count += count;
  36
  37         return 0;
  38 }
  39
  40 static int diff__process_sample_event(event_t *event, struct perf_session *session)
  41 {
  42         struct addr_location al;
  43         struct sample_data data = { .period = 1, };
  44
  45         dump_printf("(IP, %d): %d: %#Lx\n", event->header.misc,
  46                     event->ip.pid, event->ip.ip);
  47
  48         if (event__preprocess_sample(event, session, &al, NULL) < 0) {
  49                 pr_warning("problem processing %d event, skipping it.\n",
  50                            event->header.type);
  51                 return -1;
  52         }
  53
  54         if (al.filtered || al.sym == NULL)
  55                 return 0;
  56
  57         event__parse_sample(event, session->sample_type, &data);
  58
  59         if (perf_session__add_hist_entry(session, &al, data.period)) {
  60                 pr_warning("problem incrementing symbol count, skipping event\n");
  61                 return -1;
  62         }
  63
  64         session->events_stats.total += data.period;
  65         return 0;
  66 }
  67
  68 static struct perf_event_ops event_ops = {
  69         .sample = diff__process_sample_event,
  70         .mmap   = event__process_mmap,
  71         .comm   = event__process_comm,
  72         .exit   = event__process_task,
  73         .fork   = event__process_task,
  74         .lost   = event__process_lost,
  75 };
  76
  77 static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
  78                                                     struct hist_entry *he)
  79 {
  80         struct rb_node **p = &root->rb_node;
  81         struct rb_node *parent = NULL;
  82         struct hist_entry *iter;
  83
  84         while (*p != NULL) {
  85                 parent = *p;
  86                 iter = rb_entry(parent, struct hist_entry, rb_node);
  87                 if (hist_entry__cmp(he, iter) < 0)
  88                         p = &(*p)->rb_left;
  89                 else
  90                         p = &(*p)->rb_right;
  91         }
  92
  93         rb_link_node(&he->rb_node, parent, p);
  94         rb_insert_color(&he->rb_node, root);
  95 }
  96
  97 static void perf_session__resort_hist_entries(struct perf_session *self)
  98 {
  99         unsigned long position = 1;
 100         struct rb_root tmp = RB_ROOT;
 101         struct rb_node *next = rb_first(&self->hists);
 102
 103         while (next != NULL) {
 104                 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
 105
 106                 next = rb_next(&n->rb_node);
 107                 rb_erase(&n->rb_node, &self->hists);
 108                 n->position = position++;
 109                 perf_session__insert_hist_entry_by_name(&tmp, n);
 110         }
 111
 112         self->hists = tmp;
 113 }
 114
 115 static void perf_session__set_hist_entries_positions(struct perf_session *self)
 116 {
 117         perf_session__output_resort(self, self->events_stats.total);
 118         perf_session__resort_hist_entries(self);
 119 }
 120
 121 static struct hist_entry *
 122 perf_session__find_hist_entry(struct perf_session *self,
 123                               struct hist_entry *he)
 124 {
 125         struct rb_node *n = self->hists.rb_node;
 126
 127         while (n) {
 128                 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
 129                 int64_t cmp = hist_entry__cmp(he, iter);
 130
 131                 if (cmp < 0)
 132                         n = n->rb_left;
 133                 else if (cmp > 0)
 134                         n = n->rb_right;
 135                 else
 136                         return iter;
 137         }
 138
 139         return NULL;
 140 }
 141
 142 static void perf_session__match_hists(struct perf_session *old_session,
 143                                       struct perf_session *new_session)
 144 {
 145         struct rb_node *nd;
 146
 147         for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) {
 148                 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
 149                 pos->pair = perf_session__find_hist_entry(old_session, pos);
 150         }
 151 }
 152
 153 static int __cmd_diff(void)
 154 {
 155         int ret, i;
 156         struct perf_session *session[2];
 157
 158         session[0] = perf_session__new(input_old, O_RDONLY, force);
 159         session[1] = perf_session__new(input_new, O_RDONLY, force);
 160         if (session[0] == NULL || session[1] == NULL)
 161                 return -ENOMEM;
 162
 163         for (i = 0; i < 2; ++i) {
 164                 ret = perf_session__process_events(session[i], &event_ops);
 165                 if (ret)
 166                         goto out_delete;
 167         }
 168
 169         perf_session__output_resort(session[1], session[1]->events_stats.total);
 170         if (show_displacement)
 171                 perf_session__set_hist_entries_positions(session[0]);
 172
 173         perf_session__match_hists(session[0], session[1]);
 174         perf_session__fprintf_hists(session[1], session[0],
 175                                     show_displacement, stdout);
 176 out_delete:
 177         for (i = 0; i < 2; ++i)
 178                 perf_session__delete(session[i]);
 179         return ret;
 180 }
 181
 182 static const char * const diff_usage[] = {
 183         "perf diff [<options>] [old_file] [new_file]",
 184         NULL,
 185 };
 186
 187 static const struct option options[] = {
 188         OPT_BOOLEAN('v', "verbose", &verbose,
 189                     "be more verbose (show symbol address, etc)"),
 190         OPT_BOOLEAN('m', "displacement", &show_displacement,
 191                     "Show position displacement relative to baseline"),
 192         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 193                     "dump raw trace in ASCII"),
 194         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 195         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 196                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 197         OPT_BOOLEAN('P', "full-paths", &symbol_conf.full_paths,
 198                     "Don't shorten the pathnames taking into account the cwd"),
 199         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 200                    "only consider symbols in these dsos"),
 201         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
 202                    "only consider symbols in these comms"),
 203         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 204                    "only consider these symbols"),
 205         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 206                    "sort by key(s): pid, comm, dso, symbol, parent"),
 207         OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
 208                    "separator for columns, no spaces will be added between "
 209                    "columns '.' is reserved."),
 210         OPT_END()
 211 };
 212
 213 int cmd_diff(int argc, const char **argv, const char *prefix __used)
 214 {
 215         sort_order = diff__default_sort_order;
 216         argc = parse_options(argc, argv, options, diff_usage, 0);
 217         if (argc) {
 218                 if (argc > 2)
 219                         usage_with_options(diff_usage, options);
 220                 if (argc == 2) {
 221                         input_old = argv[0];
 222                         input_new = argv[1];
 223                 } else
 224                         input_new = argv[0];
 225         }
 226
 227         symbol_conf.exclude_other = false;
 228         if (symbol__init() < 0)
 229                 return -1;
 230
 231         setup_sorting(diff_usage, options);
 232         setup_pager();
 233
 234         sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
 235         sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
 236         sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
 237
 238         return __cmd_diff();
 239 }