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 struct perf_diff {
  28         struct perf_tool tool;
  29         struct perf_session *session;
  30 };
  31
  32 static int hists__add_entry(struct hists *self,
  33                             struct addr_location *al, u64 period)
  34 {
  35         if (__hists__add_entry(self, al, NULL, period) != NULL)
  36                 return 0;
  37         return -ENOMEM;
  38 }
  39
  40 static int diff__process_sample_event(struct perf_tool *tool,
  41                                       union perf_event *event,
  42                                       struct perf_sample *sample,
  43                                       struct perf_evsel *evsel __used,
  44                                       struct machine *machine)
  45 {
  46         struct perf_diff *_diff = container_of(tool, struct perf_diff, tool);
  47         struct perf_session *session = _diff->session;
  48         struct addr_location al;
  49
  50         if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) {
  51                 pr_warning("problem processing %d event, skipping it.\n",
  52                            event->header.type);
  53                 return -1;
  54         }
  55
  56         if (al.filtered || al.sym == NULL)
  57                 return 0;
  58
  59         if (hists__add_entry(&session->hists, &al, sample->period)) {
  60                 pr_warning("problem incrementing symbol period, skipping event\n");
  61                 return -1;
  62         }
  63
  64         session->hists.stats.total_period += sample->period;
  65         return 0;
  66 }
  67
  68 static struct perf_diff diff = {
  69         .tool = {
  70                 .sample = diff__process_sample_event,
  71                 .mmap   = perf_event__process_mmap,
  72                 .comm   = perf_event__process_comm,
  73                 .exit   = perf_event__process_task,
  74                 .fork   = perf_event__process_task,
  75                 .lost   = perf_event__process_lost,
  76                 .ordered_samples = true,
  77                 .ordering_requires_timestamps = true,
  78         },
  79 };
  80
  81 static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
  82                                                     struct hist_entry *he)
  83 {
  84         struct rb_node **p = &root->rb_node;
  85         struct rb_node *parent = NULL;
  86         struct hist_entry *iter;
  87
  88         while (*p != NULL) {
  89                 parent = *p;
  90                 iter = rb_entry(parent, struct hist_entry, rb_node);
  91                 if (hist_entry__cmp(he, iter) < 0)
  92                         p = &(*p)->rb_left;
  93                 else
  94                         p = &(*p)->rb_right;
  95         }
  96
  97         rb_link_node(&he->rb_node, parent, p);
  98         rb_insert_color(&he->rb_node, root);
  99 }
 100
 101 static void hists__resort_entries(struct hists *self)
 102 {
 103         unsigned long position = 1;
 104         struct rb_root tmp = RB_ROOT;
 105         struct rb_node *next = rb_first(&self->entries);
 106
 107         while (next != NULL) {
 108                 struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
 109
 110                 next = rb_next(&n->rb_node);
 111                 rb_erase(&n->rb_node, &self->entries);
 112                 n->position = position++;
 113                 perf_session__insert_hist_entry_by_name(&tmp, n);
 114         }
 115
 116         self->entries = tmp;
 117 }
 118
 119 static struct hist_entry *hists__find_entry(struct hists *self,
 120                                             struct hist_entry *he)
 121 {
 122         struct rb_node *n = self->entries.rb_node;
 123
 124         while (n) {
 125                 struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
 126                 int64_t cmp = hist_entry__cmp(he, iter);
 127
 128                 if (cmp < 0)
 129                         n = n->rb_left;
 130                 else if (cmp > 0)
 131                         n = n->rb_right;
 132                 else
 133                         return iter;
 134         }
 135
 136         return NULL;
 137 }
 138
 139 static void hists__match(struct hists *older, struct hists *newer)
 140 {
 141         struct rb_node *nd;
 142
 143         for (nd = rb_first(&newer->entries); nd; nd = rb_next(nd)) {
 144                 struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
 145                 pos->pair = hists__find_entry(older, pos);
 146         }
 147 }
 148
 149 static int __cmd_diff(void)
 150 {
 151         int ret, i;
 152 #define older (session[0])
 153 #define newer (session[1])
 154         struct perf_session *session[2];
 155
 156         older = perf_session__new(input_old, O_RDONLY, force, false,
 157                                   &diff.tool);
 158         newer = perf_session__new(input_new, O_RDONLY, force, false,
 159                                   &diff.tool);
 160         if (session[0] == NULL || session[1] == NULL)
 161                 return -ENOMEM;
 162
 163         for (i = 0; i < 2; ++i) {
 164                 diff.session = session[i];
 165                 ret = perf_session__process_events(session[i], &diff.tool);
 166                 if (ret)
 167                         goto out_delete;
 168                 hists__output_resort(&session[i]->hists);
 169         }
 170
 171         if (show_displacement)
 172                 hists__resort_entries(&older->hists);
 173
 174         hists__match(&older->hists, &newer->hists);
 175         hists__fprintf(&newer->hists, &older->hists,
 176                        show_displacement, true, 0, 0, stdout);
 177 out_delete:
 178         for (i = 0; i < 2; ++i)
 179                 perf_session__delete(session[i]);
 180         return ret;
 181 #undef older
 182 #undef newer
 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_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
 201                    "only consider symbols in these dsos"),
 202         OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
 203                    "only consider symbols in these comms"),
 204         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
 205                    "only consider these symbols"),
 206         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 207                    "sort by key(s): pid, comm, dso, symbol, parent"),
 208         OPT_STRING('t', "field-separator", &symbol_conf.field_sep, "separator",
 209                    "separator for columns, no spaces will be added between "
 210                    "columns '.' is reserved."),
 211         OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
 212                     "Look for files with symbols relative to this directory"),
 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         } else if (symbol_conf.default_guest_vmlinux_name ||
 229                    symbol_conf.default_guest_kallsyms) {
 230                 input_old = "perf.data.host";
 231                 input_new = "perf.data.guest";
 232         }
 233
 234         symbol_conf.exclude_other = false;
 235         if (symbol__init() < 0)
 236                 return -1;
 237
 238         setup_sorting(diff_usage, options);
 239         setup_pager();
 240
 241         sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", NULL);
 242         sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", NULL);
 243         sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", NULL);
 244
 245         return __cmd_diff();
 246 }