tools/perf/builtin-trace.c

   1 #include "builtin.h"
   2
   3 #include "util/util.h"
   4 #include "util/cache.h"
   5 #include "util/symbol.h"
   6 #include "util/thread.h"
   7 #include "util/header.h"
   8
   9 #include "util/parse-options.h"
  10
  11 #include "perf.h"
  12 #include "util/debug.h"
  13
  14 #include "util/trace-event.h"
  15
  16 static char             const *input_name = "perf.data";
  17 static int              input;
  18 static unsigned long    page_size;
  19 static unsigned long    mmap_window = 32;
  20
  21 static unsigned long    total = 0;
  22 static unsigned long    total_comm = 0;
  23
  24 static struct rb_root   threads;
  25 static struct thread    *last_match;
  26
  27 static struct perf_header *header;
  28 static u64              sample_type;
  29
  30
  31 static int
  32 process_comm_event(event_t *event, unsigned long offset, unsigned long head)
  33 {
  34         struct thread *thread;
  35
  36         thread = threads__findnew(event->comm.pid, &threads, &last_match);
  37
  38         dump_printf("%p [%p]: PERF_EVENT_COMM: %s:%d\n",
  39                 (void *)(offset + head),
  40                 (void *)(long)(event->header.size),
  41                 event->comm.comm, event->comm.pid);
  42
  43         if (thread == NULL ||
  44             thread__set_comm(thread, event->comm.comm)) {
  45                 dump_printf("problem processing PERF_EVENT_COMM, skipping event.\n");
  46                 return -1;
  47         }
  48         total_comm++;
  49
  50         return 0;
  51 }
  52
  53 static int
  54 process_sample_event(event_t *event, unsigned long offset, unsigned long head)
  55 {
  56         char level;
  57         int show = 0;
  58         struct dso *dso = NULL;
  59         struct thread *thread;
  60         u64 ip = event->ip.ip;
  61         u64 period = 1;
  62         void *more_data = event->ip.__more_data;
  63         int cpumode;
  64
  65         thread = threads__findnew(event->ip.pid, &threads, &last_match);
  66
  67         if (sample_type & PERF_SAMPLE_PERIOD) {
  68                 period = *(u64 *)more_data;
  69                 more_data += sizeof(u64);
  70         }
  71
  72         dump_printf("%p [%p]: PERF_EVENT_SAMPLE (IP, %d): %d/%d: %p period: %Ld\n",
  73                 (void *)(offset + head),
  74                 (void *)(long)(event->header.size),
  75                 event->header.misc,
  76                 event->ip.pid, event->ip.tid,
  77                 (void *)(long)ip,
  78                 (long long)period);
  79
  80         dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
  81
  82         if (thread == NULL) {
  83                 eprintf("problem processing %d event, skipping it.\n",
  84                         event->header.type);
  85                 return -1;
  86         }
  87
  88         cpumode = event->header.misc & PERF_EVENT_MISC_CPUMODE_MASK;
  89
  90         if (cpumode == PERF_EVENT_MISC_KERNEL) {
  91                 show = SHOW_KERNEL;
  92                 level = 'k';
  93
  94                 dso = kernel_dso;
  95
  96                 dump_printf(" ...... dso: %s\n", dso->name);
  97
  98         } else if (cpumode == PERF_EVENT_MISC_USER) {
  99
 100                 show = SHOW_USER;
 101                 level = '.';
 102
 103         } else {
 104                 show = SHOW_HV;
 105                 level = 'H';
 106
 107                 dso = hypervisor_dso;
 108
 109                 dump_printf(" ...... dso: [hypervisor]\n");
 110         }
 111
 112         if (sample_type & PERF_SAMPLE_RAW) {
 113                 struct {
 114                         u32 size;
 115                         char data[0];
 116                 } *raw = more_data;
 117
 118                 /*
 119                  * FIXME: better resolve from pid from the struct trace_entry
 120                  * field, although it should be the same than this perf
 121                  * event pid
 122                  */
 123                 print_event(0, raw->data, raw->size, 0, thread->comm);
 124         }
 125         total += period;
 126
 127         return 0;
 128 }
 129
 130 static int
 131 process_event(event_t *event, unsigned long offset, unsigned long head)
 132 {
 133         trace_event(event);
 134
 135         switch (event->header.type) {
 136         case PERF_EVENT_MMAP ... PERF_EVENT_LOST:
 137                 return 0;
 138
 139         case PERF_EVENT_COMM:
 140                 return process_comm_event(event, offset, head);
 141
 142         case PERF_EVENT_EXIT ... PERF_EVENT_READ:
 143                 return 0;
 144
 145         case PERF_EVENT_SAMPLE:
 146                 return process_sample_event(event, offset, head);
 147
 148         case PERF_EVENT_MAX:
 149         default:
 150                 return -1;
 151         }
 152
 153         return 0;
 154 }
 155
 156 static int __cmd_trace(void)
 157 {
 158         int ret, rc = EXIT_FAILURE;
 159         unsigned long offset = 0;
 160         unsigned long head = 0;
 161         struct stat perf_stat;
 162         event_t *event;
 163         uint32_t size;
 164         char *buf;
 165
 166         trace_report();
 167         register_idle_thread(&threads, &last_match);
 168
 169         input = open(input_name, O_RDONLY);
 170         if (input < 0) {
 171                 perror("failed to open file");
 172                 exit(-1);
 173         }
 174
 175         ret = fstat(input, &perf_stat);
 176         if (ret < 0) {
 177                 perror("failed to stat file");
 178                 exit(-1);
 179         }
 180
 181         if (!perf_stat.st_size) {
 182                 fprintf(stderr, "zero-sized file, nothing to do!\n");
 183                 exit(0);
 184         }
 185         header = perf_header__read(input);
 186         sample_type = perf_header__sample_type(header);
 187
 188         if (!(sample_type & PERF_SAMPLE_RAW))
 189                 die("No trace sample to read. Did you call perf record "
 190                     "without -R?");
 191
 192         if (load_kernel() < 0) {
 193                 perror("failed to load kernel symbols");
 194                 return EXIT_FAILURE;
 195         }
 196
 197 remap:
 198         buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
 199                            MAP_SHARED, input, offset);
 200         if (buf == MAP_FAILED) {
 201                 perror("failed to mmap file");
 202                 exit(-1);
 203         }
 204
 205 more:
 206         event = (event_t *)(buf + head);
 207
 208         size = event->header.size;
 209         if (!size)
 210                 size = 8;
 211
 212         if (head + event->header.size >= page_size * mmap_window) {
 213                 unsigned long shift = page_size * (head / page_size);
 214                 int res;
 215
 216                 res = munmap(buf, page_size * mmap_window);
 217                 assert(res == 0);
 218
 219                 offset += shift;
 220                 head -= shift;
 221                 goto remap;
 222         }
 223
 224         size = event->header.size;
 225
 226
 227         if (!size || process_event(event, offset, head) < 0) {
 228
 229                 /*
 230                  * assume we lost track of the stream, check alignment, and
 231                  * increment a single u64 in the hope to catch on again 'soon'.
 232                  */
 233
 234                 if (unlikely(head & 7))
 235                         head &= ~7ULL;
 236
 237                 size = 8;
 238         }
 239
 240         head += size;
 241
 242         if (offset + head < (unsigned long)perf_stat.st_size)
 243                 goto more;
 244
 245         rc = EXIT_SUCCESS;
 246         close(input);
 247
 248         return rc;
 249 }
 250
 251 static const char * const annotate_usage[] = {
 252         "perf trace [<options>] <command>",
 253         NULL
 254 };
 255
 256 static const struct option options[] = {
 257         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 258                     "dump raw trace in ASCII"),
 259         OPT_BOOLEAN('v', "verbose", &verbose,
 260                     "be more verbose (show symbol address, etc)"),
 261         OPT_END()
 262 };
 263
 264 int cmd_trace(int argc, const char **argv, const char *prefix __used)
 265 {
 266         symbol__init();
 267         page_size = getpagesize();
 268
 269         argc = parse_options(argc, argv, options, annotate_usage, 0);
 270         if (argc) {
 271                 /*
 272                  * Special case: if there's an argument left then assume tha
 273                  * it's a symbol filter:
 274                  */
 275                 if (argc > 1)
 276                         usage_with_options(annotate_usage, options);
 277         }
 278
 279
 280         setup_pager();
 281
 282         return __cmd_trace();
 283 }