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/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 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->hists,
  30                                                                al, NULL,
  31                                                                count, &hit);
  32         if (he == NULL)
  33                 return -ENOMEM;
  34
  35         if (hit)
  36                 he->count += count;
  37
  38         return 0;
  39 }
  40
  41 static int diff__process_sample_event(event_t *event, struct perf_session *session)
  42 {
  43         struct addr_location al;
  44         struct sample_data data = { .period = 1, };
  45
  46         dump_printf("(IP, %d): %d: %#Lx\n", event->header.misc,
  47                     event->ip.pid, event->ip.ip);
  48
  49         if (event__preprocess_sample(event, session, &al, NULL) < 0) {
  50                 pr_warning("problem processing %d event, skipping it.\n",
  51                            event->header.type);
  52                 return -1;
  53         }
  54
  55         if (al.filtered || al.sym == NULL)
  56                 return 0;
  57
  58         event__parse_sample(event, session->sample_type, &data);
  59
  60         if (perf_session__add_hist_entry(session, &al, data.period)) {
  61                 pr_warning("problem incrementing symbol count, skipping event\n");
  62                 return -1;
  63         }
  64
  65         session->events_stats.total += data.period;
  66         return 0;
  67 }
  68
  69 static struct perf_event_ops event_ops = {
  70         .sample = diff__process_sample_event,
  71         .mmap   = event__process_mmap,
  72         .comm   = event__process_comm,
  73         .exit   = event__process_task,
  74         .fork   = event__process_task,
  75         .lost   = event__process_lost,
  76 };
  77
  78 static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
  79                                                     struct hist_entry *he)
  80 {
  81         struct rb_node **p = &root->rb_node;
  82         struct rb_node *parent = NULL;
  83         struct hist_entry *iter;
  84
  85         while (*p != NULL) {
  86                 parent = *p;
  87                 iter = rb_entry(parent, struct hist_entry, rb_node);
  88                 if (hist_entry__cmp(he, iter) < 0)
  89                         p = &(*p)->rb_left;
  90                 else
  91                         p = &(*p)->rb_right;
  92         }
  93
  94         rb_link_node(&he->rb_node, parent, p);
  95         rb_insert_color(&he->rb_node, root);
  96 }
  97
  98 static void perf_session__resort_hist_entries(struct perf_session *self)
  99 {
 100         unsigned long position = 1;
 101         struct rb_root tmp = RB_ROOT;
 102         struct rb_node *next = rb_first(&self->hists);
 103
 104         while (next != NULL) {
 105                 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
 106
 107                 next = rb_next(&n->rb_node);
 108                 rb_erase(&n->rb_node, &self->hists);
 109                 n->position = position++;
 110                 perf_session__insert_hist_entry_by_name(&tmp, n);
 111         }
 112
 113         self->hists = tmp;
 114 }
 115
 116 static void perf_session__set_hist_entries_positions(struct perf_session *self)
 117 {
 118         perf_session__output_resort(&self->hists, self->events_stats.total);
 119         perf_session__resort_hist_entries(self);
 120 }
 121
 122 static struct hist_entry *
 123 perf_session__find_hist_entry(struct perf_session *self,
 124                               struct hist_entry *he)
 125 {
 126         struct rb_node *n = self->hists.rb_node;
 127
 128         while (n) {
 129                 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
 130                 int64_t cmp = hist_entry__cmp(he, iter);
 131
 132                 if (cmp < 0)
 133                         n = n->rb_left;
 134                 else if (cmp > 0)
 135                         n = n->rb_right;
 136                 else
 137                         return iter;
 138         }
 139
 140         return NULL;
 141 }
 142
 143 static void perf_session__match_hists(struct perf_session *old_session,
 144                                       struct perf_session *new_session)
 145 {
 146         struct rb_node *nd;
 147
 148         for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) {
 149                 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
 150                 pos->pair = perf_session__find_hist_entry(old_session, pos);
 151         }
 152 }
 153
 154 static int __cmd_diff(void)
 155 {
 156         int ret, i;
 157         struct perf_session *session[2];
 158
 159         session[0] = perf_session__new(input_old, O_RDONLY, force);
 160         session[1] = perf_session__new(input_new, O_RDONLY, force);
 161         if (session[0] == NULL || session[1] == NULL)
 162                 return -ENOMEM;
 163
 164         for (i = 0; i < 2; ++i) {
 165                 ret = perf_session__process_events(session[i], &event_ops);
 166                 if (ret)
 167                         goto out_delete;
 168         }
 169
 170         perf_session__output_resort(&session[1]->hists,
 171                                     session[1]->events_stats.total);
 172         if (show_displacement)
 173                 perf_session__set_hist_entries_positions(session[0]);
 174
 175         perf_session__match_hists(session[0], session[1]);
 176         perf_session__fprintf_hists(&session[1]->hists, session[0],
 177                                     show_displacement, stdout,
 178                                     session[1]->events_stats.total);
 179 out_delete:
 180         for (i = 0; i < 2; ++i)
 181                 perf_session__delete(session[i]);
 182         return ret;
 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_BOOLEAN('P', "full-paths", &symbol_conf.full_paths,
 201                     "Don't shorten the pathnames taking into account the cwd"),
 202         OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 203                    "only consider symbols in these dsos"),
 204         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
 205                    "only consider symbols in these comms"),
 206         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 207                    "only consider these symbols"),
 208         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 209                    "sort by key(s): pid, comm, dso, symbol, parent"),
 210         OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
 211                    "separator for columns, no spaces will be added between "
 212                    "columns '.' is reserved."),
 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         }
 229
 230         symbol_conf.exclude_other = false;
 231         if (symbol__init() < 0)
 232                 return -1;
 233
 234         setup_sorting(diff_usage, options);
 235         setup_pager();
 236
 237         sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
 238         sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
 239         sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
 240
 241         return __cmd_diff();
 242 }