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_RECORD_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_RECORD_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 timestamp = -1;
  62         u32 cpu = -1;
  63         u64 period = 1;
  64         void *more_data = event->ip.__more_data;
  65         int cpumode;
  66
  67         thread = threads__findnew(event->ip.pid, &threads, &last_match);
  68
  69         if (sample_type & PERF_SAMPLE_TIME) {
  70                 timestamp = *(u64 *)more_data;
  71                 more_data += sizeof(u64);
  72         }
  73
  74         if (sample_type & PERF_SAMPLE_CPU) {
  75                 cpu = *(u32 *)more_data;
  76                 more_data += sizeof(u32);
  77                 more_data += sizeof(u32); /* reserved */
  78         }
  79
  80         if (sample_type & PERF_SAMPLE_PERIOD) {
  81                 period = *(u64 *)more_data;
  82                 more_data += sizeof(u64);
  83         }
  84
  85         dump_printf("%p [%p]: PERF_RECORD_SAMPLE (IP, %d): %d/%d: %p period: %Ld\n",
  86                 (void *)(offset + head),
  87                 (void *)(long)(event->header.size),
  88                 event->header.misc,
  89                 event->ip.pid, event->ip.tid,
  90                 (void *)(long)ip,
  91                 (long long)period);
  92
  93         dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
  94
  95         if (thread == NULL) {
  96                 eprintf("problem processing %d event, skipping it.\n",
  97                         event->header.type);
  98                 return -1;
  99         }
 100
 101         cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 102
 103         if (cpumode == PERF_RECORD_MISC_KERNEL) {
 104                 show = SHOW_KERNEL;
 105                 level = 'k';
 106
 107                 dso = kernel_dso;
 108
 109                 dump_printf(" ...... dso: %s\n", dso->name);
 110
 111         } else if (cpumode == PERF_RECORD_MISC_USER) {
 112
 113                 show = SHOW_USER;
 114                 level = '.';
 115
 116         } else {
 117                 show = SHOW_HV;
 118                 level = 'H';
 119
 120                 dso = hypervisor_dso;
 121
 122                 dump_printf(" ...... dso: [hypervisor]\n");
 123         }
 124
 125         if (sample_type & PERF_SAMPLE_RAW) {
 126                 struct {
 127                         u32 size;
 128                         char data[0];
 129                 } *raw = more_data;
 130
 131                 /*
 132                  * FIXME: better resolve from pid from the struct trace_entry
 133                  * field, although it should be the same than this perf
 134                  * event pid
 135                  */
 136                 print_event(cpu, raw->data, raw->size, timestamp, thread->comm);
 137         }
 138         total += period;
 139
 140         return 0;
 141 }
 142
 143 static int
 144 process_event(event_t *event, unsigned long offset, unsigned long head)
 145 {
 146         trace_event(event);
 147
 148         switch (event->header.type) {
 149         case PERF_RECORD_MMAP ... PERF_RECORD_LOST:
 150                 return 0;
 151
 152         case PERF_RECORD_COMM:
 153                 return process_comm_event(event, offset, head);
 154
 155         case PERF_RECORD_EXIT ... PERF_RECORD_READ:
 156                 return 0;
 157
 158         case PERF_RECORD_SAMPLE:
 159                 return process_sample_event(event, offset, head);
 160
 161         case PERF_RECORD_MAX:
 162         default:
 163                 return -1;
 164         }
 165
 166         return 0;
 167 }
 168
 169 static int __cmd_trace(void)
 170 {
 171         int ret, rc = EXIT_FAILURE;
 172         unsigned long offset = 0;
 173         unsigned long head = 0;
 174         struct stat perf_stat;
 175         event_t *event;
 176         uint32_t size;
 177         char *buf;
 178
 179         trace_report();
 180         register_idle_thread(&threads, &last_match);
 181
 182         input = open(input_name, O_RDONLY);
 183         if (input < 0) {
 184                 perror("failed to open file");
 185                 exit(-1);
 186         }
 187
 188         ret = fstat(input, &perf_stat);
 189         if (ret < 0) {
 190                 perror("failed to stat file");
 191                 exit(-1);
 192         }
 193
 194         if (!perf_stat.st_size) {
 195                 fprintf(stderr, "zero-sized file, nothing to do!\n");
 196                 exit(0);
 197         }
 198         header = perf_header__read(input);
 199         head = header->data_offset;
 200         sample_type = perf_header__sample_type(header);
 201
 202         if (!(sample_type & PERF_SAMPLE_RAW))
 203                 die("No trace sample to read. Did you call perf record "
 204                     "without -R?");
 205
 206         if (load_kernel() < 0) {
 207                 perror("failed to load kernel symbols");
 208                 return EXIT_FAILURE;
 209         }
 210
 211 remap:
 212         buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
 213                            MAP_SHARED, input, offset);
 214         if (buf == MAP_FAILED) {
 215                 perror("failed to mmap file");
 216                 exit(-1);
 217         }
 218
 219 more:
 220         event = (event_t *)(buf + head);
 221
 222         size = event->header.size;
 223         if (!size)
 224                 size = 8;
 225
 226         if (head + event->header.size >= page_size * mmap_window) {
 227                 unsigned long shift = page_size * (head / page_size);
 228                 int res;
 229
 230                 res = munmap(buf, page_size * mmap_window);
 231                 assert(res == 0);
 232
 233                 offset += shift;
 234                 head -= shift;
 235                 goto remap;
 236         }
 237
 238         size = event->header.size;
 239
 240
 241         if (!size || process_event(event, offset, head) < 0) {
 242
 243                 /*
 244                  * assume we lost track of the stream, check alignment, and
 245                  * increment a single u64 in the hope to catch on again 'soon'.
 246                  */
 247
 248                 if (unlikely(head & 7))
 249                         head &= ~7ULL;
 250
 251                 size = 8;
 252         }
 253
 254         head += size;
 255
 256         if (offset + head < (unsigned long)perf_stat.st_size)
 257                 goto more;
 258
 259         rc = EXIT_SUCCESS;
 260         close(input);
 261
 262         return rc;
 263 }
 264
 265 static const char * const annotate_usage[] = {
 266         "perf trace [<options>] <command>",
 267         NULL
 268 };
 269
 270 static const struct option options[] = {
 271         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 272                     "dump raw trace in ASCII"),
 273         OPT_BOOLEAN('v', "verbose", &verbose,
 274                     "be more verbose (show symbol address, etc)"),
 275         OPT_END()
 276 };
 277
 278 int cmd_trace(int argc, const char **argv, const char *prefix __used)
 279 {
 280         symbol__init();
 281         page_size = getpagesize();
 282
 283         argc = parse_options(argc, argv, options, annotate_usage, 0);
 284         if (argc) {
 285                 /*
 286                  * Special case: if there's an argument left then assume tha
 287                  * it's a symbol filter:
 288                  */
 289                 if (argc > 1)
 290                         usage_with_options(annotate_usage, options);
 291         }
 292
 293
 294         setup_pager();
 295
 296         return __cmd_trace();
 297 }