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/session.h"
  14 #include "util/tool.h"
  15 #include "util/sort.h"
  16 #include "util/symbol.h"
  17 #include "util/util.h"
  18
  19 #include <stdlib.h>
  20
  21 static char const *input_old = "perf.data.old",
  22                   *input_new = "perf.data";
  23 static char       diff__default_sort_order[] = "dso,symbol";
  24 static bool  force;
  25 static bool show_displacement;
  26
  27 static int hists__add_entry(struct hists *self,
  28                             struct addr_location *al, u64 period)
  29 {
  30         if (__hists__add_entry(self, al, NULL, period) != NULL)
  31                 return 0;
  32         return -ENOMEM;
  33 }
  34
  35 static int diff__process_sample_event(struct perf_tool *tool __used,
  36                                       union perf_event *event,
  37                                       struct perf_sample *sample,
  38                                       struct perf_evsel *evsel __used,
  39                                       struct machine *machine)
  40 {
  41         struct addr_location al;
  42
  43         if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) {
  44                 pr_warning("problem processing %d event, skipping it.\n",
  45                            event->header.type);
  46                 return -1;
  47         }
  48
  49         if (al.filtered || al.sym == NULL)
  50                 return 0;
  51
  52         if (hists__add_entry(&evsel->hists, &al, sample->period)) {
  53                 pr_warning("problem incrementing symbol period, skipping event\n");
  54                 return -1;
  55         }
  56
  57         evsel->hists.stats.total_period += sample->period;
  58         return 0;
  59 }
  60
  61 static struct perf_tool perf_diff = {
  62         .sample = diff__process_sample_event,
  63         .mmap   = perf_event__process_mmap,
  64         .comm   = perf_event__process_comm,
  65         .exit   = perf_event__process_task,
  66         .fork   = perf_event__process_task,
  67         .lost   = perf_event__process_lost,
  68         .ordered_samples = true,
  69         .ordering_requires_timestamps = true,
  70 };
  71
  72 static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
  73                                                     struct hist_entry *he)
  74 {
  75         struct rb_node **p = &root->rb_node;
  76         struct rb_node *parent = NULL;
  77         struct hist_entry *iter;
  78
  79         while (*p != NULL) {
  80                 parent = *p;
  81                 iter = rb_entry(parent, struct hist_entry, rb_node);
  82                 if (hist_entry__cmp(he, iter) < 0)
  83                         p = &(*p)->rb_left;
  84                 else
  85                         p = &(*p)->rb_right;
  86         }
  87
  88         rb_link_node(&he->rb_node, parent, p);
  89         rb_insert_color(&he->rb_node, root);
  90 }
  91
  92 static void hists__resort_entries(struct hists *self)
  93 {
  94         unsigned long position = 1;
  95         struct rb_root tmp = RB_ROOT;
  96         struct rb_node *next = rb_first(&self->entries);
  97
  98         while (next != NULL) {
  99                 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
 100
 101                 next = rb_next(&n->rb_node);
 102                 rb_erase(&n->rb_node, &self->entries);
 103                 n->position = position++;
 104                 perf_session__insert_hist_entry_by_name(&tmp, n);
 105         }
 106
 107         self->entries = tmp;
 108 }
 109
 110 static void hists__set_positions(struct hists *self)
 111 {
 112         hists__output_resort(self);
 113         hists__resort_entries(self);
 114 }
 115
 116 static struct hist_entry *hists__find_entry(struct hists *self,
 117                                             struct hist_entry *he)
 118 {
 119         struct rb_node *n = self->entries.rb_node;
 120
 121         while (n) {
 122                 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
 123                 int64_t cmp = hist_entry__cmp(he, iter);
 124
 125                 if (cmp < 0)
 126                         n = n->rb_left;
 127                 else if (cmp > 0)
 128                         n = n->rb_right;
 129                 else
 130                         return iter;
 131         }
 132
 133         return NULL;
 134 }
 135
 136 static void hists__match(struct hists *older, struct hists *newer)
 137 {
 138         struct rb_node *nd;
 139
 140         for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) {
 141                 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
 142                 pos->pair = hists__find_entry(older, pos);
 143         }
 144 }
 145
 146 static int __cmd_diff(void)
 147 {
 148         int ret, i;
 149         struct perf_session *session[2];
 150
 151         session[0] = perf_session__new(input_old, O_RDONLY, force, false, &perf_diff);
 152         session[1] = perf_session__new(input_new, O_RDONLY, force, false, &perf_diff);
 153         if (session[0] == NULL || session[1] == NULL)
 154                 return -ENOMEM;
 155
 156         for (i = 0; i < 2; ++i) {
 157                 ret = perf_session__process_events(session[i], &perf_diff);
 158                 if (ret)
 159                         goto out_delete;
 160         }
 161
 162         hists__output_resort(&session[1]->hists);
 163         if (show_displacement)
 164                 hists__set_positions(&session[0]->hists);
 165
 166         hists__match(&session[0]->hists, &session[1]->hists);
 167         hists__fprintf(&session[1]->hists, &session[0]->hists,
 168                        show_displacement, true, 0, 0, stdout);
 169 out_delete:
 170         for (i = 0; i < 2; ++i)
 171                 perf_session__delete(session[i]);
 172         return ret;
 173 }
 174
 175 static const char * const diff_usage[] = {
 176         "perf diff [<options>] [old_file] [new_file]",
 177         NULL,
 178 };
 179
 180 static const struct option options[] = {
 181         OPT_INCR('v', "verbose", &verbose,
 182                     "be more verbose (show symbol address, etc)"),
 183         OPT_BOOLEAN('M', "displacement", &show_displacement,
 184                     "Show position displacement relative to baseline"),
 185         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 186                     "dump raw trace in ASCII"),
 187         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 188         OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
 189                     "load module symbols - WARNING: use only with -k and LIVE kernel"),
 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_STRING(0, "symfs", &symbol_conf.symfs, "directory",
 202                     "Look for files with symbols relative to this directory"),
 203         OPT_END()
 204 };
 205
 206 int cmd_diff(int argc, const char **argv, const char *prefix __used)
 207 {
 208         sort_order = diff__default_sort_order;
 209         argc = parse_options(argc, argv, options, diff_usage, 0);
 210         if (argc) {
 211                 if (argc > 2)
 212                         usage_with_options(diff_usage, options);
 213                 if (argc == 2) {
 214                         input_old = argv[0];
 215                         input_new = argv[1];
 216                 } else
 217                         input_new = argv[0];
 218         } else if (symbol_conf.default_guest_vmlinux_name ||
 219                    symbol_conf.default_guest_kallsyms) {
 220                 input_old = "perf.data.host";
 221                 input_new = "perf.data.guest";
 222         }
 223
 224         symbol_conf.exclude_other = false;
 225         if (symbol__init() < 0)
 226                 return -1;
 227
 228         setup_sorting(diff_usage, options);
 229         setup_pager();
 230
 231         sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
 232         sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
 233         sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
 234
 235         return __cmd_diff();
 236 }