Pileus Git - ~andy/linux/blob - 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 int         force;
  22 static bool        show_percent;
  23
  24 struct symbol_conf symbol_conf;
  25
  26 static int perf_session__add_hist_entry(struct perf_session *self,
  27                                         struct addr_location *al, u64 count)
  28 {
  29         bool hit;
  30         struct hist_entry *he = __perf_session__add_hist_entry(self, 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: %p\n", event->header.misc,
  47                     event->ip.pid, (void *)(long)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         event__parse_sample(event, session->sample_type, &data);
  56
  57         if (al.sym && perf_session__add_hist_entry(session, &al, data.period)) {
  58                 pr_warning("problem incrementing symbol count, skipping event\n");
  59                 return -1;
  60         }
  61
  62         session->events_stats.total += data.period;
  63         return 0;
  64 }
  65
  66 static struct perf_event_ops event_ops = {
  67         .process_sample_event = diff__process_sample_event,
  68         .process_mmap_event   = event__process_mmap,
  69         .process_comm_event   = event__process_comm,
  70         .process_exit_event   = event__process_task,
  71         .process_fork_event   = event__process_task,
  72         .process_lost_event   = event__process_lost,
  73 };
  74
  75 static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
  76                                                     struct hist_entry *he)
  77 {
  78         struct rb_node **p = &root->rb_node;
  79         struct rb_node *parent = NULL;
  80         struct hist_entry *iter;
  81
  82         while (*p != NULL) {
  83                 int cmp;
  84                 parent = *p;
  85                 iter = rb_entry(parent, struct hist_entry, rb_node);
  86
  87                 cmp = strcmp(he->map->dso->name, iter->map->dso->name);
  88                 if (cmp > 0)
  89                         p = &(*p)->rb_left;
  90                 else if (cmp < 0)
  91                         p = &(*p)->rb_right;
  92                 else {
  93                         cmp = strcmp(he->sym->name, iter->sym->name);
  94                         if (cmp > 0)
  95                                 p = &(*p)->rb_left;
  96                         else
  97                                 p = &(*p)->rb_right;
  98                 }
  99         }
 100
 101         rb_link_node(&he->rb_node, parent, p);
 102         rb_insert_color(&he->rb_node, root);
 103 }
 104
 105 static void perf_session__resort_by_name(struct perf_session *self)
 106 {
 107         unsigned long position = 1;
 108         struct rb_root tmp = RB_ROOT;
 109         struct rb_node *next = rb_first(&self->hists);
 110
 111         while (next != NULL) {
 112                 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
 113
 114                 next = rb_next(&n->rb_node);
 115                 rb_erase(&n->rb_node, &self->hists);
 116                 n->position = position++;
 117                 perf_session__insert_hist_entry_by_name(&tmp, n);
 118         }
 119
 120         self->hists = tmp;
 121 }
 122
 123 static struct hist_entry *
 124 perf_session__find_hist_entry_by_name(struct perf_session *self,
 125                                       struct hist_entry *he)
 126 {
 127         struct rb_node *n = self->hists.rb_node;
 128
 129         while (n) {
 130                 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
 131                 int cmp = strcmp(he->map->dso->name, iter->map->dso->name);
 132
 133                 if (cmp > 0)
 134                         n = n->rb_left;
 135                 else if (cmp < 0)
 136                         n = n->rb_right;
 137                 else {
 138                         cmp = strcmp(he->sym->name, iter->sym->name);
 139                         if (cmp > 0)
 140                                 n = n->rb_left;
 141                         else if (cmp < 0)
 142                                 n = n->rb_right;
 143                         else
 144                                 return iter;
 145                 }
 146         }
 147
 148         return NULL;
 149 }
 150
 151 static void perf_session__match_hists(struct perf_session *old_session,
 152                                       struct perf_session *new_session)
 153 {
 154         struct rb_node *nd;
 155
 156         perf_session__resort_by_name(old_session);
 157
 158         for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) {
 159                 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
 160                 pos->pair = perf_session__find_hist_entry_by_name(old_session, pos);
 161         }
 162 }
 163
 164 static size_t hist_entry__fprintf_matched(struct hist_entry *self,
 165                                           unsigned long pos,
 166                                           struct perf_session *session,
 167                                           struct perf_session *pair_session,
 168                                           FILE *fp)
 169 {
 170         u64 old_count = 0;
 171         char displacement[16];
 172         size_t printed;
 173
 174         if (self->pair != NULL) {
 175                 long pdiff = (long)self->pair->position - (long)pos;
 176                 old_count = self->pair->count;
 177                 if (pdiff == 0)
 178                         goto blank;
 179                 snprintf(displacement, sizeof(displacement), "%+4ld", pdiff);
 180         } else {
 181 blank:          memset(displacement, ' ', sizeof(displacement));
 182         }
 183
 184         printed = fprintf(fp, "%4lu %5.5s ", pos, displacement);
 185
 186         if (show_percent) {
 187                 double old_percent = (old_count * 100) / pair_session->events_stats.total,
 188                        new_percent = (self->count * 100) / session->events_stats.total;
 189                 double diff = old_percent - new_percent;
 190
 191                 if (verbose)
 192                         printed += fprintf(fp, " %3.2f%% %3.2f%%", old_percent, new_percent);
 193
 194                 if ((u64)diff != 0)
 195                         printed += fprintf(fp, " %+4.2F%%", diff);
 196                 else
 197                         printed += fprintf(fp, "       ");
 198         } else {
 199                 if (verbose)
 200                         printed += fprintf(fp, " %9Lu %9Lu", old_count, self->count);
 201                 printed += fprintf(fp, " %+9Ld", (s64)self->count - (s64)old_count);
 202         }
 203
 204         return printed + fprintf(fp, " %25.25s   %s\n",
 205                                  self->map->dso->name, self->sym->name);
 206 }
 207
 208 static size_t perf_session__fprintf_matched_hists(struct perf_session *self,
 209                                                   struct perf_session *pair,
 210                                                   FILE *fp)
 211 {
 212         struct rb_node *nd;
 213         size_t printed = 0;
 214         unsigned long pos = 1;
 215
 216         for (nd = rb_first(&self->hists); nd; nd = rb_next(nd)) {
 217                 struct hist_entry *he = rb_entry(nd, struct hist_entry, rb_node);
 218                 printed += hist_entry__fprintf_matched(he, pos++, self, pair, fp);
 219         }
 220
 221         return printed;
 222 }
 223
 224 static int __cmd_diff(void)
 225 {
 226         int ret, i;
 227         struct perf_session *session[2];
 228
 229         session[0] = perf_session__new(input_old, O_RDONLY, force, &symbol_conf);
 230         session[1] = perf_session__new(input_new, O_RDONLY, force, &symbol_conf);
 231         if (session[0] == NULL || session[1] == NULL)
 232                 return -ENOMEM;
 233
 234         for (i = 0; i < 2; ++i) {
 235                 ret = perf_session__process_events(session[i], &event_ops);
 236                 if (ret)
 237                         goto out_delete;
 238                 perf_session__output_resort(session[i], session[i]->events_stats.total);
 239         }
 240
 241         perf_session__match_hists(session[0], session[1]);
 242         perf_session__fprintf_matched_hists(session[1], session[0], stdout);
 243 out_delete:
 244         for (i = 0; i < 2; ++i)
 245                 perf_session__delete(session[i]);
 246         return ret;
 247 }
 248
 249 static const char *const diff_usage[] = {
 250         "perf diff [<options>] [old_file] [new_file]",
 251 };
 252
 253 static const struct option options[] = {
 254         OPT_BOOLEAN('v', "verbose", &verbose,
 255                     "be more verbose (show symbol address, etc)"),
 256         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 257                     "dump raw trace in ASCII"),
 258         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 259         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 260                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 261         OPT_BOOLEAN('p', "percentages", &show_percent,
 262                     "Don't shorten the pathnames taking into account the cwd"),
 263         OPT_BOOLEAN('P', "full-paths", &event_ops.full_paths,
 264                     "Don't shorten the pathnames taking into account the cwd"),
 265         OPT_END()
 266 };
 267
 268 int cmd_diff(int argc, const char **argv, const char *prefix __used)
 269 {
 270         if (symbol__init(&symbol_conf) < 0)
 271                 return -1;
 272
 273         setup_sorting(diff_usage, options);
 274
 275         argc = parse_options(argc, argv, options, diff_usage, 0);
 276         if (argc) {
 277                 if (argc > 2)
 278                         usage_with_options(diff_usage, options);
 279                 if (argc == 2) {
 280                         input_old = argv[0];
 281                         input_new = argv[1];
 282                 } else
 283                         input_new = argv[0];
 284         }
 285
 286         setup_pager();
 287         return __cmd_diff();
 288 }