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