lttng/commands/add_context.c

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; only version 2
   7  * of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #define _GNU_SOURCE
  20 #include <ctype.h>
  21 #include <popt.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <sys/stat.h>
  26 #include <sys/types.h>
  27 #include <unistd.h>
  28
  29 #include <urcu/list.h>
  30
  31 #include "../cmd.h"
  32 #include "../conf.h"
  33 #include "../utils.h"
  34
  35 #define PRINT_LINE_LEN  80
  36
  37 static char *opt_event_name;
  38 static char *opt_channel_name;
  39 static char *opt_session_name;
  40 static int *opt_kernel;
  41 static int opt_pid_all;
  42 static int opt_userspace;
  43 static char *opt_cmd_name;
  44 static pid_t opt_pid;
  45 static char *opt_type;
  46
  47 enum {
  48         OPT_HELP = 1,
  49         OPT_TYPE,
  50         OPT_USERSPACE,
  51 };
  52
  53 static struct lttng_handle *handle;
  54
  55 /*
  56  * Taken from the LTTng ABI
  57  */
  58 enum context_type {
  59         CONTEXT_PID          = 0,
  60         CONTEXT_PERF_COUNTER = 1,
  61         CONTEXT_COMM         = 2,
  62         CONTEXT_PRIO         = 3,
  63         CONTEXT_NICE         = 4,
  64         CONTEXT_VPID         = 5,
  65         CONTEXT_TID          = 6,
  66         CONTEXT_VTID         = 7,
  67         CONTEXT_PPID         = 8,
  68         CONTEXT_VPPID        = 9,
  69 };
  70
  71 /*
  72  * Taken from the Perf ABI (all enum perf_*)
  73  */
  74 enum perf_type {
  75         PERF_TYPE_HARDWARE = 0,
  76         PERF_TYPE_SOFTWARE = 1,
  77         PERF_TYPE_HW_CACHE = 3,
  78 };
  79
  80 enum perf_count_hard {
  81         PERF_COUNT_HW_CPU_CYCLES                = 0,
  82         PERF_COUNT_HW_INSTRUCTIONS              = 1,
  83         PERF_COUNT_HW_CACHE_REFERENCES          = 2,
  84         PERF_COUNT_HW_CACHE_MISSES              = 3,
  85         PERF_COUNT_HW_BRANCH_INSTRUCTIONS       = 4,
  86         PERF_COUNT_HW_BRANCH_MISSES             = 5,
  87         PERF_COUNT_HW_BUS_CYCLES                = 6,
  88         PERF_COUNT_HW_STALLED_CYCLES_FRONTEND   = 7,
  89         PERF_COUNT_HW_STALLED_CYCLES_BACKEND    = 8,
  90 };
  91
  92 enum perf_count_soft {
  93         PERF_COUNT_SW_CPU_CLOCK        = 0,
  94         PERF_COUNT_SW_TASK_CLOCK       = 1,
  95         PERF_COUNT_SW_PAGE_FAULTS      = 2,
  96         PERF_COUNT_SW_CONTEXT_SWITCHES = 3,
  97         PERF_COUNT_SW_CPU_MIGRATIONS   = 4,
  98         PERF_COUNT_SW_PAGE_FAULTS_MIN  = 5,
  99         PERF_COUNT_SW_PAGE_FAULTS_MAJ  = 6,
 100         PERF_COUNT_SW_ALIGNMENT_FAULTS = 7,
 101         PERF_COUNT_SW_EMULATION_FAULTS = 8,
 102 };
 103
 104 /*
 105  * Generalized hardware cache events:
 106  *
 107  *       { L1-D, L1-I, LLC, ITLB, DTLB, BPU } x
 108  *       { read, write, prefetch } x
 109  *       { accesses, misses }
 110  */
 111 enum perf_hw_cache_id {
 112         PERF_COUNT_HW_CACHE_L1D                 = 0,
 113         PERF_COUNT_HW_CACHE_L1I                 = 1,
 114         PERF_COUNT_HW_CACHE_LL                  = 2,
 115         PERF_COUNT_HW_CACHE_DTLB                = 3,
 116         PERF_COUNT_HW_CACHE_ITLB                = 4,
 117         PERF_COUNT_HW_CACHE_BPU                 = 5,
 118
 119         PERF_COUNT_HW_CACHE_MAX,                /* non-ABI */
 120 };
 121
 122 enum perf_hw_cache_op_id {
 123         PERF_COUNT_HW_CACHE_OP_READ             = 0,
 124         PERF_COUNT_HW_CACHE_OP_WRITE            = 1,
 125         PERF_COUNT_HW_CACHE_OP_PREFETCH         = 2,
 126
 127         PERF_COUNT_HW_CACHE_OP_MAX,             /* non-ABI */
 128 };
 129
 130 enum perf_hw_cache_op_result_id {
 131         PERF_COUNT_HW_CACHE_RESULT_ACCESS       = 0,
 132         PERF_COUNT_HW_CACHE_RESULT_MISS         = 1,
 133
 134         PERF_COUNT_HW_CACHE_RESULT_MAX,         /* non-ABI */
 135 };
 136
 137 static struct poptOption long_options[] = {
 138         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
 139         {"help",           'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
 140         {"session",        's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
 141         {"channel",        'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
 142         {"event",          'e', POPT_ARG_STRING, &opt_event_name, 0, 0, 0},
 143         {"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
 144         {"userspace",      'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, 0, OPT_USERSPACE, 0, 0},
 145         {"all",            0,   POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
 146         {"pid",            'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
 147         {"type",           't', POPT_ARG_STRING, &opt_type, OPT_TYPE, 0, 0},
 148         {0, 0, 0, 0, 0, 0, 0}
 149 };
 150
 151 /*
 152  * Context options
 153  */
 154 #define PERF_HW(opt, name)                                              \
 155         {                                                               \
 156                 "perf:" #opt, CONTEXT_PERF_COUNTER,                     \
 157                 .u.perf = { PERF_TYPE_HARDWARE, PERF_COUNT_HW_##name, },\
 158         }
 159
 160 #define PERF_SW(opt, name)                                              \
 161         {                                                               \
 162                 "perf:" #opt, CONTEXT_PERF_COUNTER,                     \
 163                 .u.perf = { PERF_TYPE_SOFTWARE, PERF_COUNT_SW_##name, },\
 164         }
 165
 166 #define _PERF_HW_CACHE(optstr, name, op, result)                        \
 167         {                                                               \
 168                 "perf:" optstr, CONTEXT_PERF_COUNTER,                   \
 169                 .u.perf = {                                             \
 170                         PERF_TYPE_HW_CACHE,                             \
 171                         (uint64_t) PERF_COUNT_HW_CACHE_##name           \
 172                         | ((uint64_t) PERF_COUNT_HW_CACHE_OP_##op << 8) \
 173                         | ((uint64_t) PERF_COUNT_HW_CACHE_RESULT_##result << 16), \
 174                 },                                                      \
 175         }
 176
 177 #define PERF_HW_CACHE(opt, name)                                        \
 178         _PERF_HW_CACHE(#opt "-loads", name, READ, ACCESS),              \
 179         _PERF_HW_CACHE(#opt "-load-misses", name, READ, MISS),          \
 180         _PERF_HW_CACHE(#opt "-stores", name, WRITE, ACCESS),            \
 181         _PERF_HW_CACHE(#opt "-store-misses", name, WRITE, MISS),        \
 182         _PERF_HW_CACHE(#opt "-prefetches", name, PREFETCH, ACCESS),     \
 183         _PERF_HW_CACHE(#opt "-prefetch-misses", name, PREFETCH, MISS)   \
 184
 185 static
 186 const struct ctx_opts {
 187         char *symbol;
 188         enum context_type ctx_type;
 189         union {
 190                 struct {
 191                         uint32_t type;
 192                         uint64_t config;
 193                 } perf;
 194         } u;
 195 } ctx_opts[] = {
 196         { "pid", CONTEXT_PID },
 197         { "comm", CONTEXT_COMM },
 198         { "prio", CONTEXT_PRIO },
 199         { "nice", CONTEXT_NICE },
 200         { "vpid", CONTEXT_VPID },
 201         { "tid", CONTEXT_TID },
 202         { "vtid", CONTEXT_VTID },
 203         { "ppid", CONTEXT_PPID },
 204         { "vppid", CONTEXT_VPPID },
 205         /* Perf options */
 206         PERF_HW(cpu-cycles, CPU_CYCLES),
 207         PERF_HW(cycles, CPU_CYCLES),
 208         PERF_HW(stalled-cycles-frontend, STALLED_CYCLES_FRONTEND),
 209         PERF_HW(idle-cycles-frontend, STALLED_CYCLES_FRONTEND),
 210         PERF_HW(stalled-cycles-backend, STALLED_CYCLES_BACKEND),
 211         PERF_HW(idle-cycles-backend, STALLED_CYCLES_BACKEND),
 212         PERF_HW(instructions, INSTRUCTIONS),
 213         PERF_HW(cache-references, CACHE_REFERENCES),
 214         PERF_HW(cache-misses, CACHE_MISSES),
 215         PERF_HW(branch-instructions, BRANCH_INSTRUCTIONS),
 216         PERF_HW(branches, BRANCH_INSTRUCTIONS),
 217         PERF_HW(branch-misses, BRANCH_MISSES),
 218         PERF_HW(bus-cycles, BUS_CYCLES),
 219
 220         PERF_HW_CACHE(L1-dcache, L1D),
 221         PERF_HW_CACHE(L1-icache, L1I),
 222         PERF_HW_CACHE(LLC, LL),
 223         PERF_HW_CACHE(dTLB, DTLB),
 224         _PERF_HW_CACHE("iTLB-loads", ITLB, READ, ACCESS),
 225         _PERF_HW_CACHE("iTLB-load-misses", ITLB, READ, MISS),
 226         _PERF_HW_CACHE("branch-loads", BPU, READ, ACCESS),
 227         _PERF_HW_CACHE("branch-load-misses", BPU, READ, MISS),
 228
 229
 230         PERF_SW(cpu-clock, CPU_CLOCK),
 231         PERF_SW(task-clock, TASK_CLOCK),
 232         PERF_SW(page-fault, PAGE_FAULTS),
 233         PERF_SW(faults, PAGE_FAULTS),
 234         PERF_SW(major-faults, PAGE_FAULTS_MAJ),
 235         PERF_SW(minor-faults, PAGE_FAULTS_MIN),
 236         PERF_SW(context-switches, CONTEXT_SWITCHES),
 237         PERF_SW(cs, CONTEXT_SWITCHES),
 238         PERF_SW(cpu-migrations, CPU_MIGRATIONS),
 239         PERF_SW(migrations, CPU_MIGRATIONS),
 240         PERF_SW(alignment-faults, ALIGNMENT_FAULTS),
 241         PERF_SW(emulation-faults, EMULATION_FAULTS),
 242         { NULL, -1 },           /* Closure */
 243 };
 244
 245 #undef PERF_SW
 246 #undef PERF_HW
 247
 248 /*
 249  * Context type for command line option parsing.
 250  */
 251 struct ctx_type {
 252         const struct ctx_opts *opt;
 253         struct cds_list_head list;
 254 };
 255
 256 /*
 257  * List of context type. Use to enable multiple context on a single command
 258  * line entry.
 259  */
 260 struct ctx_type_list {
 261         struct cds_list_head head;
 262 } ctx_type_list = {
 263         .head = CDS_LIST_HEAD_INIT(ctx_type_list.head),
 264 };
 265
 266 /*
 267  * Pretty print context type.
 268  */
 269 static void print_ctx_type(FILE *ofp)
 270 {
 271         const char *indent = "                               ";
 272         int indent_len = strlen(indent);
 273         int len, i = 0;
 274
 275         fprintf(ofp, "%s", indent);
 276         len = indent_len;
 277         while (ctx_opts[i].symbol != NULL) {
 278                 if (len > indent_len) {
 279                         if (len + strlen(ctx_opts[i].symbol) + 2
 280                                         >= PRINT_LINE_LEN) {
 281                                 fprintf(ofp, ",\n");
 282                                 fprintf(ofp, "%s", indent);
 283                                 len = indent_len;
 284                         } else {
 285                                 len += fprintf(ofp, ", ");
 286                         }
 287                 }
 288                 len += fprintf(ofp, "%s", ctx_opts[i].symbol);
 289                 i++;
 290         }
 291 }
 292
 293 /*
 294  * usage
 295  */
 296 static void usage(FILE *ofp)
 297 {
 298         fprintf(ofp, "usage: lttng add-context -t TYPE\n");
 299         fprintf(ofp, "\n");
 300         fprintf(ofp, "If no event name is given (-e), the context will be added to\n");
 301         fprintf(ofp, "all events in the channel.\n");
 302         fprintf(ofp, "If no channel and no event is given (-c/-e), the context\n");
 303         fprintf(ofp, "will be added to all events in all channels.\n");
 304         fprintf(ofp, "\n");
 305         fprintf(ofp, "Options:\n");
 306         fprintf(ofp, "  -h, --help               Show this help\n");
 307         fprintf(ofp, "  -s, --session            Apply on session name\n");
 308         fprintf(ofp, "  -c, --channel NAME       Apply on channel\n");
 309         fprintf(ofp, "  -e, --event NAME         Apply on event\n");
 310         fprintf(ofp, "  -k, --kernel             Apply for the kernel tracer\n");
 311         fprintf(ofp, "  -u, --userspace          Apply for the user-space tracer\n");
 312         fprintf(ofp, "      --all                If -u, apply on all traceable apps\n");
 313         fprintf(ofp, "  -p, --pid PID            If -u, apply on a specific PID\n");
 314         fprintf(ofp, "  -t, --type TYPE          Context type. You can repeat that option on\n");
 315         fprintf(ofp, "                           the command line.\n");
 316         fprintf(ofp, "                           TYPE can be one of the strings below:\n");
 317         print_ctx_type(ofp);
 318         fprintf(ofp, "\n");
 319         fprintf(ofp, "Example:\n");
 320         fprintf(ofp, "This command will add the context information 'prio' and two perf\n"
 321                         "counters: hardware branch misses and cache misses, to all events\n"
 322                         "in the trace data output:\n");
 323         fprintf(ofp, "# lttng add-context -k -t prio -t perf:branch-misses -t perf:cache-misses\n");
 324         fprintf(ofp, "\n");
 325 }
 326
 327 /*
 328  * Find context numerical value from string.
 329  */
 330 static int find_ctx_type_idx(const char *opt)
 331 {
 332         int ret = -1, i = 0;
 333
 334         while (ctx_opts[i].symbol != NULL) {
 335                 if (strcmp(opt, ctx_opts[i].symbol) == 0) {
 336                         ret = i;
 337                         goto end;
 338                 }
 339                 i++;
 340         }
 341
 342 end:
 343         return ret;
 344 }
 345
 346 /*
 347  * Add context to channel or event.
 348  */
 349 static int add_context(char *session_name)
 350 {
 351         int ret = CMD_SUCCESS;
 352         struct lttng_event_context context;
 353         struct lttng_domain dom;
 354         struct ctx_type *type;
 355         char *ptr;
 356
 357         if (opt_kernel) {
 358                 dom.type = LTTNG_DOMAIN_KERNEL;
 359         }
 360
 361         handle = lttng_create_handle(session_name, &dom);
 362         if (handle == NULL) {
 363                 ret = -1;
 364                 goto error;
 365         }
 366
 367         /* Iterate over all context type given */
 368         cds_list_for_each_entry(type, &ctx_type_list.head, list) {
 369
 370                 context.ctx = type->opt->ctx_type;
 371                 if (context.ctx == LTTNG_EVENT_CONTEXT_PERF_COUNTER) {
 372                         context.u.perf_counter.type = type->opt->u.perf.type;
 373                         context.u.perf_counter.config = type->opt->u.perf.config;
 374                         strcpy(context.u.perf_counter.name, type->opt->symbol);
 375                         /* Replace : and - by _ */
 376                         while ((ptr = strchr(context.u.perf_counter.name, '-')) != NULL) {
 377                                 *ptr = '_';
 378                         }
 379                         while ((ptr = strchr(context.u.perf_counter.name, ':')) != NULL) {
 380                                 *ptr = '_';
 381                         }
 382                 }
 383                 if (opt_kernel) {
 384                         DBG("Adding kernel context");
 385                         ret = lttng_add_context(handle, &context, opt_event_name,
 386                                         opt_channel_name);
 387                         if (ret < 0) {
 388                                 fprintf(stderr, "%s: ", type->opt->symbol);
 389                                 continue;
 390                         } else {
 391                                 MSG("Kernel context %s added", type->opt->symbol);
 392                         }
 393                 } else if (opt_userspace) {             /* User-space tracer action */
 394                         /*
 395                          * TODO: Waiting on lttng UST 2.0
 396                          */
 397                         if (opt_pid_all) {
 398                         } else if (opt_pid != 0) {
 399                         }
 400                         ret = CMD_NOT_IMPLEMENTED;
 401                         goto error;
 402                 } else {
 403                         ERR("Please specify a tracer (--kernel or --userspace)");
 404                         goto error;
 405                 }
 406         }
 407
 408 error:
 409         lttng_destroy_handle(handle);
 410
 411         return ret;
 412 }
 413
 414 /*
 415  * Add context on channel or event.
 416  */
 417 int cmd_add_context(int argc, const char **argv)
 418 {
 419         int index, opt, ret = CMD_SUCCESS;
 420         static poptContext pc;
 421         struct ctx_type *type, *tmptype;
 422         char *session_name = NULL;
 423
 424         if (argc < 2) {
 425                 usage(stderr);
 426                 goto end;
 427         }
 428
 429         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 430         poptReadDefaultConfig(pc, 0);
 431
 432         while ((opt = poptGetNextOpt(pc)) != -1) {
 433                 switch (opt) {
 434                 case OPT_HELP:
 435                         usage(stderr);
 436                         ret = CMD_SUCCESS;
 437                         goto end;
 438                 case OPT_TYPE:
 439                         type = malloc(sizeof(struct ctx_type));
 440                         if (type == NULL) {
 441                                 perror("malloc ctx_type");
 442                                 ret = -1;
 443                                 goto end;
 444                         }
 445                         index = find_ctx_type_idx(opt_type);
 446                         if (index < 0) {
 447                                 ERR("Unknown context type %s", opt_type);
 448                                 goto end;
 449                         }
 450                         type->opt = &ctx_opts[index];
 451                         if (type->opt->ctx_type == -1) {
 452                                 ERR("Unknown context type %s", opt_type);
 453                         } else {
 454                                 cds_list_add(&type->list, &ctx_type_list.head);
 455                         }
 456                         break;
 457                 case OPT_USERSPACE:
 458                         opt_userspace = 1;
 459                         opt_cmd_name = poptGetOptArg(pc);
 460                         break;
 461                 default:
 462                         usage(stderr);
 463                         ret = CMD_UNDEFINED;
 464                         goto end;
 465                 }
 466         }
 467
 468         if (!opt_session_name) {
 469                 session_name = get_session_name();
 470                 if (session_name == NULL) {
 471                         ret = -1;
 472                         goto end;
 473                 }
 474         } else {
 475                 session_name = opt_session_name;
 476         }
 477
 478         ret = add_context(session_name);
 479
 480         /* Cleanup allocated memory */
 481         cds_list_for_each_entry_safe(type, tmptype, &ctx_type_list.head, list) {
 482                 free(type);
 483         }
 484
 485 end:
 486         return ret;
 487 }