src/common.c

   1 /*
   2  * Copyright (C) 2011 Julien Desfossez
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License Version 2 as
   6  * published by the Free Software Foundation;
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #include <babeltrace/ctf/events.h>
  19 #include <stdlib.h>
  20 #include <linux/unistd.h>
  21 #include <string.h>
  22 #include "common.h"
  23
  24 uint64_t get_cpu_id(const struct bt_ctf_event *event)
  25 {
  26         const struct definition *scope;
  27         uint64_t cpu_id;
  28
  29         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_PACKET_CONTEXT);
  30         cpu_id = bt_ctf_get_uint64(bt_ctf_get_field(event, scope, "cpu_id"));
  31         if (bt_ctf_field_get_error()) {
  32                 fprintf(stderr, "[error] get cpu_id\n");
  33                 return -1ULL;
  34         }
  35
  36         return cpu_id;
  37 }
  38
  39 uint64_t get_context_tid(const struct bt_ctf_event *event)
  40 {
  41         const struct definition *scope;
  42         uint64_t tid;
  43
  44         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
  45         tid = bt_ctf_get_int64(bt_ctf_get_field(event,
  46                                 scope, "_tid"));
  47         if (bt_ctf_field_get_error()) {
  48                 fprintf(stderr, "Missing tid context info\n");
  49                 return -1ULL;
  50         }
  51
  52         return tid;
  53 }
  54
  55 uint64_t get_context_pid(const struct bt_ctf_event *event)
  56 {
  57         const struct definition *scope;
  58         uint64_t pid;
  59
  60         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
  61         pid = bt_ctf_get_int64(bt_ctf_get_field(event,
  62                                 scope, "_pid"));
  63         if (bt_ctf_field_get_error()) {
  64                 fprintf(stderr, "Missing pid context info\n");
  65                 return -1ULL;
  66         }
  67
  68         return pid;
  69 }
  70
  71 uint64_t get_context_ppid(const struct bt_ctf_event *event)
  72 {
  73         const struct definition *scope;
  74         uint64_t ppid;
  75
  76         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
  77         ppid = bt_ctf_get_int64(bt_ctf_get_field(event,
  78                                 scope, "_ppid"));
  79         if (bt_ctf_field_get_error()) {
  80                 fprintf(stderr, "Missing ppid context info\n");
  81                 return -1ULL;
  82         }
  83
  84         return ppid;
  85 }
  86
  87 char *get_context_comm(const struct bt_ctf_event *event)
  88 {
  89         const struct definition *scope;
  90         char *comm;
  91
  92         scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
  93         comm = bt_ctf_get_char_array(bt_ctf_get_field(event,
  94                                 scope, "_procname"));
  95         if (bt_ctf_field_get_error()) {
  96                 fprintf(stderr, "Missing comm context info\n");
  97                 return NULL;
  98         }
  99
 100         return comm;
 101 }
 102
 103 /*
 104  * To get the parent process, put the pid in the tid field
 105  * because the parent process gets pid = tid
 106  *
 107  * FIXME : char *comm useful ???
 108  */
 109 struct processtop *find_process_tid(struct lttngtop *ctx, int tid, char *comm)
 110 {
 111         gint i;
 112         struct processtop *tmp;
 113
 114         for (i = 0; i < ctx->process_table->len; i++) {
 115                 tmp = g_ptr_array_index(ctx->process_table, i);
 116                 if (tmp && tmp->tid == tid)
 117                         return tmp;
 118         }
 119         return NULL;
 120 }
 121
 122 struct processtop* add_proc(struct lttngtop *ctx, int tid, char *comm,
 123                 unsigned long timestamp)
 124 {
 125         struct processtop *newproc;
 126
 127         /* if the PID already exists, we just rename the process */
 128         /* FIXME : need to integrate with clone/fork/exit to be accurate */
 129         newproc = find_process_tid(ctx, tid, comm);
 130         if (!newproc) {
 131                 newproc = g_new0(struct processtop, 1);
 132                 newproc->tid = tid;
 133                 newproc->birth = timestamp;
 134                 newproc->process_files_table = g_ptr_array_new();
 135                 newproc->files_history = NULL;
 136                 newproc->totalfileread = 0;
 137                 newproc->totalfilewrite = 0;
 138                 newproc->fileread = 0;
 139                 newproc->filewrite = 0;
 140                 newproc->syscall_info = NULL;
 141                 newproc->threadparent = NULL;
 142                 newproc->threads = g_ptr_array_new();
 143                 newproc->perf = g_hash_table_new(g_str_hash, g_str_equal);
 144                 g_ptr_array_add(ctx->process_table, newproc);
 145
 146                 ctx->nbnewthreads++;
 147                 ctx->nbthreads++;
 148         }
 149         newproc->comm = strdup(comm);
 150
 151         return newproc;
 152 }
 153
 154 struct processtop* update_proc(struct processtop* proc, int pid, int tid,
 155                 int ppid, char *comm)
 156 {
 157         if (proc) {
 158                 proc->pid = pid;
 159                 proc->tid = tid;
 160                 proc->ppid = ppid;
 161                 if (strcmp(proc->comm, comm) != 0) {
 162                         free(proc->comm);
 163                         proc->comm = strdup(comm);
 164                 }
 165         }
 166         return proc;
 167 }
 168
 169 /*
 170  * This function just sets the time of death of a process.
 171  * When we rotate the cputime we remove it from the process list.
 172  */
 173 void death_proc(struct lttngtop *ctx, int tid, char *comm,
 174                 unsigned long timestamp)
 175 {
 176         struct processtop *tmp;
 177         tmp = find_process_tid(ctx, tid, comm);
 178         if (tmp && strcmp(tmp->comm, comm) == 0) {
 179                 tmp->death = timestamp;
 180                 ctx->nbdeadthreads++;
 181                 ctx->nbthreads--;
 182         }
 183 }
 184
 185 struct processtop* get_proc(struct lttngtop *ctx, int tid, char *comm,
 186                 unsigned long timestamp)
 187 {
 188         struct processtop *tmp;
 189         tmp = find_process_tid(ctx, tid, comm);
 190         if (tmp && strcmp(tmp->comm, comm) == 0)
 191                 return tmp;
 192         return add_proc(ctx, tid, comm, timestamp);
 193 }
 194
 195 struct processtop *get_proc_pid(struct lttngtop *ctx, int tid, int pid,
 196                 unsigned long timestamp)
 197 {
 198         struct processtop *tmp;
 199         tmp = find_process_tid(ctx, tid, NULL);
 200         if (tmp && tmp->pid == pid)
 201                 return tmp;
 202         return add_proc(ctx, tid, "Unknown", timestamp);
 203 }
 204
 205 void add_thread(struct processtop *parent, struct processtop *thread)
 206 {
 207         gint i;
 208         struct processtop *tmp;
 209
 210         for (i = 0; i < parent->threads->len; i++) {
 211                 tmp = g_ptr_array_index(parent->threads, i);
 212                 if (tmp == thread)
 213                         return;
 214         }
 215         g_ptr_array_add(parent->threads, thread);
 216 }
 217
 218 struct cputime* add_cpu(int cpu)
 219 {
 220         struct cputime *newcpu;
 221
 222         newcpu = g_new0(struct cputime, 1);
 223         newcpu->id = cpu;
 224         newcpu->current_task = NULL;
 225         newcpu->perf = g_hash_table_new(g_str_hash, g_str_equal);
 226
 227         g_ptr_array_add(lttngtop.cpu_table, newcpu);
 228
 229         return newcpu;
 230 }
 231 struct cputime* get_cpu(int cpu)
 232 {
 233         gint i;
 234         struct cputime *tmp;
 235
 236         for (i = 0; i < lttngtop.cpu_table->len; i++) {
 237                 tmp = g_ptr_array_index(lttngtop.cpu_table, i);
 238                 if (tmp->id == cpu)
 239                         return tmp;
 240         }
 241
 242         return add_cpu(cpu);
 243 }
 244
 245 /*
 246  * At the end of a sampling period, we need to display the cpu time for each
 247  * process and to reset it to zero for the next period
 248  */
 249 void rotate_cputime(unsigned long end)
 250 {
 251         gint i;
 252         struct cputime *tmp;
 253         unsigned long elapsed;
 254
 255         for (i = 0; i < lttngtop.cpu_table->len; i++) {
 256                 tmp = g_ptr_array_index(lttngtop.cpu_table, i);
 257                 elapsed = end - tmp->task_start;
 258                 if (tmp->current_task) {
 259                         tmp->current_task->totalcpunsec += elapsed;
 260                         tmp->current_task->threadstotalcpunsec += elapsed;
 261                         if (tmp->current_task->pid != tmp->current_task->tid &&
 262                                         tmp->current_task->threadparent) {
 263                                 tmp->current_task->threadparent->threadstotalcpunsec += elapsed;
 264                         }
 265                 }
 266                 tmp->task_start = end;
 267         }
 268 }
 269
 270 void reset_perf_counter(gpointer key, gpointer value, gpointer user_data)
 271 {
 272         ((struct perfcounter*) value)->count = 0;
 273 }
 274
 275 void copy_perf_counter(gpointer key, gpointer value, gpointer new_table)
 276 {
 277         struct perfcounter *newperf;
 278
 279         newperf = g_new0(struct perfcounter, 1);
 280         newperf->count = ((struct perfcounter *) value)->count;
 281         newperf->visible = ((struct perfcounter *) value)->visible;
 282         newperf->sort = ((struct perfcounter *) value)->sort;
 283         g_hash_table_insert((GHashTable *) new_table, strdup(key), newperf);
 284 }
 285
 286 void rotate_perfcounter() {
 287         int i;
 288         struct processtop *tmp;
 289         for (i = 0; i < lttngtop.process_table->len; i++) {
 290                 tmp = g_ptr_array_index(lttngtop.process_table, i);
 291                 g_hash_table_foreach(tmp->perf, reset_perf_counter, NULL);
 292         }
 293 }
 294
 295 void cleanup_processtop()
 296 {
 297         gint i, j;
 298         struct processtop *tmp;
 299         struct files *tmpf; /* a temporary file */
 300
 301         for (i = 0; i < lttngtop.process_table->len; i++) {
 302                 tmp = g_ptr_array_index(lttngtop.process_table, i);
 303                 tmp->totalcpunsec = 0;
 304                 tmp->threadstotalcpunsec = 0;
 305                 tmp->fileread = 0;
 306                 tmp->filewrite = 0;
 307
 308                 for (j = 0; j < tmp->process_files_table->len; j++) {
 309                         tmpf = g_ptr_array_index(tmp->process_files_table, j);
 310                         if (tmpf != NULL) {
 311                                 tmpf->read = 0;
 312                                 tmpf->write = 0;
 313
 314                                 if (tmpf->flag == __NR_close)
 315                                         g_ptr_array_index(
 316                                                 tmp->process_files_table, j
 317                                         ) = NULL;
 318                         }
 319                 }
 320         }
 321 }
 322
 323 void reset_global_counters()
 324 {
 325         lttngtop.nbnewproc = 0;
 326         lttngtop.nbdeadproc = 0;
 327         lttngtop.nbnewthreads = 0;
 328         lttngtop.nbdeadthreads = 0;
 329         lttngtop.nbnewfiles = 0;
 330         lttngtop.nbclosedfiles = 0;
 331 }
 332
 333 void copy_global_counters(struct lttngtop *dst)
 334 {
 335         dst->nbproc = lttngtop.nbproc;
 336         dst->nbnewproc = lttngtop.nbnewproc;
 337         dst->nbdeadproc = lttngtop.nbdeadproc;
 338         dst->nbthreads = lttngtop.nbthreads;
 339         dst->nbnewthreads = lttngtop.nbnewthreads;
 340         dst->nbdeadthreads = lttngtop.nbdeadthreads;
 341         dst->nbfiles = lttngtop.nbfiles;
 342         dst->nbnewfiles = lttngtop.nbnewfiles;
 343         dst->nbclosedfiles = lttngtop.nbclosedfiles;
 344         reset_global_counters();
 345 }
 346
 347 struct lttngtop* get_copy_lttngtop(unsigned long start, unsigned long end)
 348 {
 349         gint i, j;
 350         unsigned long time;
 351         struct lttngtop *dst;
 352         struct processtop *tmp, *tmp2, *new;
 353         struct cputime *tmpcpu, *newcpu;
 354         struct files *tmpfile, *newfile;
 355
 356         dst = g_new0(struct lttngtop, 1);
 357         dst->start = start;
 358         dst->end = end;
 359         copy_global_counters(dst);
 360         dst->process_table = g_ptr_array_new();
 361         dst->files_table = g_ptr_array_new();
 362         dst->cpu_table = g_ptr_array_new();
 363         dst->perf_list = g_hash_table_new(g_str_hash, g_str_equal);
 364
 365         rotate_cputime(end);
 366
 367         g_hash_table_foreach(lttngtop.perf_list, copy_perf_counter, dst->perf_list);
 368         for (i = 0; i < lttngtop.process_table->len; i++) {
 369                 tmp = g_ptr_array_index(lttngtop.process_table, i);
 370                 new = g_new0(struct processtop, 1);
 371
 372                 memcpy(new, tmp, sizeof(struct processtop));
 373                 new->threads = g_ptr_array_new();
 374                 new->comm = strdup(tmp->comm);
 375                 new->process_files_table = g_ptr_array_new();
 376                 new->files_history = tmp->files_history;
 377                 new->perf = g_hash_table_new(g_str_hash, g_str_equal);
 378                 g_hash_table_foreach(tmp->perf, copy_perf_counter, new->perf);
 379
 380                 /* compute the stream speed */
 381                 if (end - start != 0) {
 382                         time = (end - start) / NSEC_PER_SEC;
 383                         new->fileread = new->fileread/(time);
 384                         new->filewrite = new->filewrite/(time);
 385                 }
 386
 387                 for (j = 0; j < tmp->process_files_table->len; j++) {
 388                         tmpfile = g_ptr_array_index(tmp->process_files_table, j);
 389
 390                         newfile = malloc(sizeof(struct files));
 391
 392                         if (tmpfile != NULL) {
 393                                 memcpy(newfile, tmpfile, sizeof(struct files));
 394                                 newfile->name = strdup(tmpfile->name);
 395                                 newfile->ref = new;
 396                                 g_ptr_array_add(new->process_files_table,
 397                                                 newfile);
 398                                 g_ptr_array_add(dst->files_table, newfile);
 399                         } else {
 400                                 g_ptr_array_add(new->process_files_table, NULL);
 401                                 g_ptr_array_add(dst->files_table, NULL);
 402                         }
 403                         /*
 404                          * if the process died during the last period, we remove all
 405                          * files associated with if after the copy
 406                          */
 407                         if (tmp->death > 0 && tmp->death < end) {
 408                                 /* FIXME : close the files before */
 409                                 g_ptr_array_remove(tmp->process_files_table, tmpfile);
 410                                 g_free(tmpfile);
 411                         }
 412                 }
 413                 g_ptr_array_add(dst->process_table, new);
 414
 415                 /*
 416                  * if the process died during the last period, we remove it from
 417                  * the current process list after the copy
 418                  */
 419                 if (tmp->death > 0 && tmp->death < end) {
 420                         g_ptr_array_remove(lttngtop.process_table, tmp);
 421                         /* FIXME : TRUE does not mean clears the object in it */
 422                         g_ptr_array_free(tmp->threads, TRUE);
 423                         free(tmp->comm);
 424                         g_ptr_array_free(tmp->process_files_table, TRUE);
 425                         /* FIXME : clear elements */
 426                         g_hash_table_destroy(tmp->perf);
 427                         g_free(tmp);
 428                 }
 429         }
 430         rotate_perfcounter();
 431
 432         for (i = 0; i < lttngtop.cpu_table->len; i++) {
 433                 tmpcpu = g_ptr_array_index(lttngtop.cpu_table, i);
 434                 newcpu = g_new0(struct cputime, 1);
 435                 memcpy(newcpu, tmpcpu, sizeof(struct cputime));
 436                 newcpu->perf = g_hash_table_new(g_str_hash, g_str_equal);
 437                 g_hash_table_foreach(tmpcpu->perf, copy_perf_counter, newcpu->perf);
 438                 /*
 439                  * note : we don't care about the current process pointer in the copy
 440                  * so the reference is invalid after the memcpy
 441                  */
 442                 g_ptr_array_add(dst->cpu_table, newcpu);
 443         }
 444         /* FIXME : better algo */
 445         /* create the threads index if required */
 446         for (i = 0; i < dst->process_table->len; i++) {
 447                 tmp = g_ptr_array_index(dst->process_table, i);
 448                 if (tmp->pid == tmp->tid) {
 449                         for (j = 0; j < dst->process_table->len; j++) {
 450                                 tmp2 = g_ptr_array_index(dst->process_table, j);
 451                                 if (tmp2->pid == tmp->pid) {
 452                                         tmp2->threadparent = tmp;
 453                                         g_ptr_array_add(tmp->threads, tmp2);
 454                                 }
 455                         }
 456                 }
 457         }
 458
 459         //  update_global_stats(dst);
 460         cleanup_processtop();
 461
 462         return dst;
 463 }
 464
 465
 466 enum bt_cb_ret handle_statedump_process_state(struct bt_ctf_event *call_data,
 467                 void *private_data)
 468 {
 469         const struct definition *scope;
 470         struct processtop *proc;
 471         unsigned long timestamp;
 472         int64_t pid, tid;
 473         char *procname;
 474
 475         timestamp = bt_ctf_get_timestamp(call_data);
 476         if (timestamp == -1ULL)
 477                 goto error;
 478
 479         scope = bt_ctf_get_top_level_scope(call_data,
 480                          BT_EVENT_FIELDS);
 481         pid = bt_ctf_get_int64(bt_ctf_get_field(call_data,
 482                              scope, "_pid"));
 483         if (bt_ctf_field_get_error()) {
 484                 fprintf(stderr, "Missing pid context info\n");
 485                 goto error;
 486         }
 487
 488         scope = bt_ctf_get_top_level_scope(call_data,
 489                         BT_EVENT_FIELDS);
 490         tid = bt_ctf_get_int64(bt_ctf_get_field(call_data,
 491                                 scope, "_tid"));
 492         if (bt_ctf_field_get_error()) {
 493                 fprintf(stderr, "Missing tid context info\n");
 494                 goto error;
 495         }
 496
 497         /*
 498          * FIXME
 499          * I first tried with bt_ctf_get_string but doesn`t work at all
 500          * It couldn`t find the field _name because it is an integer in
 501          * the metadata and not a string like _filename for the
 502          * statedump_file_descriptor
 503          */
 504         scope = bt_ctf_get_top_level_scope(call_data,
 505                         BT_EVENT_FIELDS);
 506         procname = bt_ctf_get_char_array(bt_ctf_get_field(call_data,
 507                                 scope, "_name"));
 508         if (bt_ctf_field_get_error()) {
 509                 fprintf(stderr, "Missing process name context info\n");
 510                 goto error;
 511         }
 512
 513         proc = find_process_tid(&lttngtop, tid, procname);
 514         if (proc == NULL)
 515                 proc = add_proc(&lttngtop, tid, procname, timestamp);
 516
 517         free(proc->comm);
 518         proc->comm = strdup(procname);
 519         proc->pid = pid;
 520
 521         /*
 522          * FIXME
 523          * I would like to free procname because it is duplicated
 524          * when the process is created but it segfaults...
 525          *
 526          * free(procname);
 527          */
 528
 529         return BT_CB_OK;
 530
 531 error:
 532         return BT_CB_ERROR_STOP;
 533 }