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