tools/perf/builtin-trace.c

   1 #include "builtin.h"
   2 #include "util/evlist.h"
   3 #include "util/parse-options.h"
   4 #include "util/thread_map.h"
   5 #include "event-parse.h"
   6
   7 #include <libaudit.h>
   8 #include <stdlib.h>
   9
  10 static struct syscall_fmt {
  11         const char *name;
  12         const char *alias;
  13         bool       errmsg;
  14         bool       timeout;
  15 } syscall_fmts[] = {
  16         { .name     = "arch_prctl", .errmsg = true, .alias = "prctl", },
  17         { .name     = "fstat",      .errmsg = true, .alias = "newfstat", },
  18         { .name     = "fstatat",    .errmsg = true, .alias = "newfstatat", },
  19         { .name     = "futex",      .errmsg = true, },
  20         { .name     = "poll",       .errmsg = true, .timeout = true, },
  21         { .name     = "ppoll",      .errmsg = true, .timeout = true, },
  22         { .name     = "read",       .errmsg = true, },
  23         { .name     = "recvfrom",   .errmsg = true, },
  24         { .name     = "select",     .errmsg = true, .timeout = true, },
  25         { .name     = "stat",       .errmsg = true, .alias = "newstat", },
  26 };
  27
  28 static int syscall_fmt__cmp(const void *name, const void *fmtp)
  29 {
  30         const struct syscall_fmt *fmt = fmtp;
  31         return strcmp(name, fmt->name);
  32 }
  33
  34 static struct syscall_fmt *syscall_fmt__find(const char *name)
  35 {
  36         const int nmemb = ARRAY_SIZE(syscall_fmts);
  37         return bsearch(name, syscall_fmts, nmemb, sizeof(struct syscall_fmt), syscall_fmt__cmp);
  38 }
  39
  40 struct syscall {
  41         struct event_format *tp_format;
  42         const char          *name;
  43         struct syscall_fmt  *fmt;
  44 };
  45
  46 struct trace {
  47         int                     audit_machine;
  48         struct {
  49                 int             max;
  50                 struct syscall  *table;
  51         } syscalls;
  52         struct perf_record_opts opts;
  53 };
  54
  55 static int trace__read_syscall_info(struct trace *trace, int id)
  56 {
  57         char tp_name[128];
  58         struct syscall *sc;
  59
  60         if (id > trace->syscalls.max) {
  61                 struct syscall *nsyscalls = realloc(trace->syscalls.table, (id + 1) * sizeof(*sc));
  62
  63                 if (nsyscalls == NULL)
  64                         return -1;
  65
  66                 if (trace->syscalls.max != -1) {
  67                         memset(nsyscalls + trace->syscalls.max + 1, 0,
  68                                (id - trace->syscalls.max) * sizeof(*sc));
  69                 } else {
  70                         memset(nsyscalls, 0, (id + 1) * sizeof(*sc));
  71                 }
  72
  73                 trace->syscalls.table = nsyscalls;
  74                 trace->syscalls.max   = id;
  75         }
  76
  77         sc = trace->syscalls.table + id;
  78         sc->name = audit_syscall_to_name(id, trace->audit_machine);
  79         if (sc->name == NULL)
  80                 return -1;
  81
  82         sc->fmt = syscall_fmt__find(sc->name);
  83
  84         snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->name);
  85         sc->tp_format = event_format__new("syscalls", tp_name);
  86
  87         if (sc->tp_format == NULL && sc->fmt && sc->fmt->alias) {
  88                 snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->fmt->alias);
  89                 sc->tp_format = event_format__new("syscalls", tp_name);
  90         }
  91
  92         return sc->tp_format != NULL ? 0 : -1;
  93 }
  94
  95 static size_t syscall__fprintf_args(struct syscall *sc, unsigned long *args, FILE *fp)
  96 {
  97         int i = 0;
  98         size_t printed = 0;
  99
 100         if (sc->tp_format != NULL) {
 101                 struct format_field *field;
 102
 103                 for (field = sc->tp_format->format.fields->next; field; field = field->next) {
 104                         printed += fprintf(fp, "%s%s: %ld", printed ? ", " : "",
 105                                            field->name, args[i++]);
 106                 }
 107         } else {
 108                 while (i < 6) {
 109                         printed += fprintf(fp, "%sarg%d: %ld", printed ? ", " : "", i, args[i]);
 110                         ++i;
 111                 }
 112         }
 113
 114         return printed;
 115 }
 116
 117 static int trace__run(struct trace *trace)
 118 {
 119         struct perf_evlist *evlist = perf_evlist__new(NULL, NULL);
 120         struct perf_evsel *evsel, *evsel_enter, *evsel_exit;
 121         int err = -1, i, nr_events = 0, before;
 122
 123         if (evlist == NULL) {
 124                 printf("Not enough memory to run!\n");
 125                 goto out;
 126         }
 127
 128         evsel_enter = perf_evsel__newtp("raw_syscalls", "sys_enter", 0);
 129         if (evsel_enter == NULL) {
 130                 printf("Couldn't read the raw_syscalls:sys_enter tracepoint information!\n");
 131                 goto out_delete_evlist;
 132         }
 133
 134         perf_evlist__add(evlist, evsel_enter);
 135
 136         evsel_exit = perf_evsel__newtp("raw_syscalls", "sys_exit", 1);
 137         if (evsel_exit == NULL) {
 138                 printf("Couldn't read the raw_syscalls:sys_exit tracepoint information!\n");
 139                 goto out_delete_evlist;
 140         }
 141
 142         perf_evlist__add(evlist, evsel_exit);
 143
 144         err = perf_evlist__create_maps(evlist, &trace->opts.target);
 145         if (err < 0) {
 146                 printf("Problems parsing the target to trace, check your options!\n");
 147                 goto out_delete_evlist;
 148         }
 149
 150         perf_evlist__config_attrs(evlist, &trace->opts);
 151
 152         err = perf_evlist__open(evlist);
 153         if (err < 0) {
 154                 printf("Couldn't create the events: %s\n", strerror(errno));
 155                 goto out_delete_evlist;
 156         }
 157
 158         err = perf_evlist__mmap(evlist, UINT_MAX, false);
 159         if (err < 0) {
 160                 printf("Couldn't mmap the events: %s\n", strerror(errno));
 161                 goto out_delete_evlist;
 162         }
 163
 164         perf_evlist__enable(evlist);
 165 again:
 166         before = nr_events;
 167
 168         for (i = 0; i < evlist->nr_mmaps; i++) {
 169                 union perf_event *event;
 170
 171                 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
 172                         const u32 type = event->header.type;
 173                         struct syscall *sc;
 174                         struct perf_sample sample;
 175                         int id;
 176
 177                         ++nr_events;
 178
 179                         switch (type) {
 180                         case PERF_RECORD_SAMPLE:
 181                                 break;
 182                         case PERF_RECORD_LOST:
 183                                 printf("LOST %" PRIu64 " events!\n", event->lost.lost);
 184                                 continue;
 185                         default:
 186                                 printf("Unexpected %s event, skipping...\n",
 187                                         perf_event__name(type));
 188                                 continue;
 189                         }
 190
 191                         err = perf_evlist__parse_sample(evlist, event, &sample);
 192                         if (err) {
 193                                 printf("Can't parse sample, err = %d, skipping...\n", err);
 194                                 continue;
 195                         }
 196
 197                         evsel = perf_evlist__id2evsel(evlist, sample.id);
 198                         if (evsel == NULL) {
 199                                 printf("Unknown tp ID %" PRIu64 ", skipping...\n", sample.id);
 200                                 continue;
 201                         }
 202
 203                         id = perf_evsel__intval(evsel, &sample, "id");
 204                         if (id < 0) {
 205                                 printf("Invalid syscall %d id, skipping...\n", id);
 206                                 continue;
 207                         }
 208
 209                         if ((id > trace->syscalls.max || trace->syscalls.table[id].name == NULL) &&
 210                             trace__read_syscall_info(trace, id))
 211                                 continue;
 212
 213                         if ((id > trace->syscalls.max || trace->syscalls.table[id].name == NULL))
 214                                 continue;
 215
 216                         sc = &trace->syscalls.table[id];
 217
 218                         if (evlist->threads->map[0] == -1 || evlist->threads->nr > 1)
 219                                 printf("%d ", sample.tid);
 220
 221                         if (evsel == evsel_enter) {
 222                                 void *args = perf_evsel__rawptr(evsel, &sample, "args");
 223
 224                                 printf("%s(", sc->name);
 225                                 syscall__fprintf_args(sc, args, stdout);
 226                         } else if (evsel == evsel_exit) {
 227                                 int ret = perf_evsel__intval(evsel, &sample, "ret");
 228
 229                                 if (ret < 0 && sc->fmt && sc->fmt->errmsg) {
 230                                         char bf[256];
 231                                         const char *emsg = strerror_r(-ret, bf, sizeof(bf)),
 232                                                    *e = audit_errno_to_name(-ret);
 233
 234                                         printf(") = -1 %s %s", e, emsg);
 235                                 } else if (ret == 0 && sc->fmt && sc->fmt->timeout)
 236                                         printf(") = 0 Timeout");
 237                                 else
 238                                         printf(") = %d", ret);
 239
 240                                 putchar('\n');
 241                         }
 242                 }
 243         }
 244
 245         if (nr_events == before)
 246                 poll(evlist->pollfd, evlist->nr_fds, -1);
 247
 248         goto again;
 249
 250 out_delete_evlist:
 251         perf_evlist__delete(evlist);
 252 out:
 253         return err;
 254 }
 255
 256 int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
 257 {
 258         const char * const trace_usage[] = {
 259                 "perf trace [<options>]",
 260                 NULL
 261         };
 262         struct trace trace = {
 263                 .audit_machine = audit_detect_machine(),
 264                 .syscalls = {
 265                         . max = -1,
 266                 },
 267                 .opts = {
 268                         .target = {
 269                                 .uid       = UINT_MAX,
 270                                 .uses_mmap = true,
 271                         },
 272                         .user_freq     = UINT_MAX,
 273                         .user_interval = ULLONG_MAX,
 274                         .no_delay      = true,
 275                         .mmap_pages    = 1024,
 276                 },
 277         };
 278         const struct option trace_options[] = {
 279         OPT_STRING('p', "pid", &trace.opts.target.pid, "pid",
 280                     "trace events on existing process id"),
 281         OPT_STRING(0, "tid", &trace.opts.target.tid, "tid",
 282                     "trace events on existing thread id"),
 283         OPT_BOOLEAN(0, "all-cpus", &trace.opts.target.system_wide,
 284                     "system-wide collection from all CPUs"),
 285         OPT_STRING(0, "cpu", &trace.opts.target.cpu_list, "cpu",
 286                     "list of cpus to monitor"),
 287         OPT_BOOLEAN(0, "no-inherit", &trace.opts.no_inherit,
 288                     "child tasks do not inherit counters"),
 289         OPT_UINTEGER(0, "mmap-pages", &trace.opts.mmap_pages,
 290                      "number of mmap data pages"),
 291         OPT_STRING(0, "uid", &trace.opts.target.uid_str, "user",
 292                    "user to profile"),
 293         OPT_END()
 294         };
 295         int err;
 296
 297         argc = parse_options(argc, argv, trace_options, trace_usage, 0);
 298         if (argc)
 299                 usage_with_options(trace_usage, trace_options);
 300
 301         err = perf_target__parse_uid(&trace.opts.target);
 302         if (err) {
 303                 char bf[BUFSIZ];
 304                 perf_target__strerror(&trace.opts.target, err, bf, sizeof(bf));
 305                 printf("%s", bf);
 306                 return err;
 307         }
 308
 309         return trace__run(&trace);
 310 }