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
 168         input = open(input_name, O_RDONLY);
 169         if (input < 0) {
 170                 perror("failed to open file");
 171                 exit(-1);
 172         }
 173
 174         ret = fstat(input, &perf_stat);
 175         if (ret < 0) {
 176                 perror("failed to stat file");
 177                 exit(-1);
 178         }
 179
 180         if (!perf_stat.st_size) {
 181                 fprintf(stderr, "zero-sized file, nothing to do!\n");
 182                 exit(0);
 183         }
 184         header = perf_header__read(input);
 185         sample_type = perf_header__sample_type(header);
 186
 187         if (!(sample_type & PERF_SAMPLE_RAW))
 188                 die("No trace sample to read. Did you call perf record "
 189                     "without -R?");
 190
 191         if (load_kernel() < 0) {
 192                 perror("failed to load kernel symbols");
 193                 return EXIT_FAILURE;
 194         }
 195
 196 remap:
 197         buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
 198                            MAP_SHARED, input, offset);
 199         if (buf == MAP_FAILED) {
 200                 perror("failed to mmap file");
 201                 exit(-1);
 202         }
 203
 204 more:
 205         event = (event_t *)(buf + head);
 206
 207         size = event->header.size;
 208         if (!size)
 209                 size = 8;
 210
 211         if (head + event->header.size >= page_size * mmap_window) {
 212                 unsigned long shift = page_size * (head / page_size);
 213                 int res;
 214
 215                 res = munmap(buf, page_size * mmap_window);
 216                 assert(res == 0);
 217
 218                 offset += shift;
 219                 head -= shift;
 220                 goto remap;
 221         }
 222
 223         size = event->header.size;
 224
 225
 226         if (!size || process_event(event, offset, head) < 0) {
 227
 228                 /*
 229                  * assume we lost track of the stream, check alignment, and
 230                  * increment a single u64 in the hope to catch on again 'soon'.
 231                  */
 232
 233                 if (unlikely(head & 7))
 234                         head &= ~7ULL;
 235
 236                 size = 8;
 237         }
 238
 239         head += size;
 240
 241         if (offset + head < (unsigned long)perf_stat.st_size)
 242                 goto more;
 243
 244         rc = EXIT_SUCCESS;
 245         close(input);
 246
 247         return rc;
 248 }
 249
 250 static const char * const annotate_usage[] = {
 251         "perf trace [<options>] <command>",
 252         NULL
 253 };
 254
 255 static const struct option options[] = {
 256         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 257                     "dump raw trace in ASCII"),
 258         OPT_BOOLEAN('v', "verbose", &verbose,
 259                     "be more verbose (show symbol address, etc)"),
 260         OPT_END()
 261 };
 262
 263 int cmd_trace(int argc, const char **argv, const char *prefix __used)
 264 {
 265         symbol__init();
 266         page_size = getpagesize();
 267
 268         argc = parse_options(argc, argv, options, annotate_usage, 0);
 269         if (argc) {
 270                 /*
 271                  * Special case: if there's an argument left then assume tha
 272                  * it's a symbol filter:
 273                  */
 274                 if (argc > 1)
 275                         usage_with_options(annotate_usage, options);
 276         }
 277
 278
 279         setup_pager();
 280
 281         return __cmd_trace();
 282 }