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