src/vm/jit/optimizing/profile.c

   1 /* src/vm/jit/optimizing/profile.c - runtime profiling
   2
   3    Copyright (C) 1996-2005, 2006, 2007 R. Grafl, A. Krall, C. Kruegel,
   4    C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
   5    E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
   6    J. Wenninger, J. Wenninger, Institut f. Computersprachen - TU Wien
   7
   8    This file is part of CACAO.
   9
  10    This program is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU General Public License as
  12    published by the Free Software Foundation; either version 2, or (at
  13    your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful, but
  16    WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  23    02110-1301, USA.
  24
  25    $Id: profile.c 7952 2007-05-23 17:53:13Z twisti $
  26
  27 */
  28
  29
  30 #include "config.h"
  31
  32 #include <assert.h>
  33 #include <stdlib.h>
  34
  35 #include "vm/types.h"
  36
  37 #include "mm/memory.h"
  38
  39 #include "threads/threads-common.h"
  40
  41 #include "vm/builtin.h"
  42 #include "vm/stringlocal.h"
  43
  44 #include "vm/jit/jit.h"
  45 #include "vm/jit/methodheader.h"
  46 #include "vm/jit/optimizing/recompile.h"
  47
  48 #include "vmcore/class.h"
  49 #include "vmcore/classcache.h"
  50 #include "vmcore/method.h"
  51 #include "vmcore/options.h"
  52
  53
  54 /* profile_init ****************************************************************
  55
  56    Initializes the profile global lock.
  57
  58 *******************************************************************************/
  59
  60 bool profile_init(void)
  61 {
  62         /* everything's ok */
  63
  64         return true;
  65 }
  66
  67
  68 /* profile_thread **************************************************************
  69
  70    XXX
  71
  72 *******************************************************************************/
  73
  74 static s4 runs = 0;
  75 static s4 hits = 0;
  76 static s4 misses = 0;
  77
  78 #if defined(ENABLE_THREADS)
  79 static void profile_thread(void)
  80 {
  81         threadobject *t;
  82         s4            nanos;
  83         u1           *pc;
  84         u1           *pv;
  85         methodinfo   *m;
  86         codeinfo     *code;
  87
  88         while (true) {
  89                 /* sleep thread for 0.5-1.0 ms */
  90
  91                 nanos = 500 + (int) (500.0 * (rand() / (RAND_MAX + 1.0)));
  92 /*              fprintf(stderr, "%d\n", nanos); */
  93
  94                 threads_sleep(0, nanos);
  95                 runs++;
  96
  97                 /* lock the threads lists */
  98
  99                 threads_list_lock();
 100
 101                 /* iterate over all started threads */
 102
 103                 for (t = threads_list_first(); t != NULL; t = threads_list_next(t)) {
 104                         /* is this a Java thread? */
 105
 106                         if (!(t->flags & THREAD_FLAG_JAVA))
 107                                 continue;
 108
 109                         /* send SIGUSR2 to thread to get the current PC */
 110                         /* XXX write a threads-function for that */
 111
 112                         pthread_kill(t->tid, SIGUSR2);
 113
 114                         /* the thread object now contains the current thread PC */
 115
 116                         pc = t->pc;
 117
 118                         /* get the PV for the current PC */
 119
 120                         pv = codegen_get_pv_from_pc_nocheck(pc);
 121
 122                         /* get methodinfo pointer from data segment */
 123
 124                         if (pv == NULL) {
 125                                 misses++;
 126                         }
 127                         else {
 128                                 code = *((codeinfo **) (pv + CodeinfoPointer));
 129
 130                                 /* For asm_vm_call_method the codeinfo pointer is NULL
 131                                    (which is also in the method tree). */
 132
 133                                 if (code != NULL) {
 134                                         m = code->m;
 135
 136                                         /* native methods are never recompiled */
 137
 138                                         if (!(m->flags & ACC_NATIVE)) {
 139                                                 /* increase the method incovation counter */
 140
 141                                                 code->frequency++;
 142                                                 hits++;
 143
 144                                                 if (code->frequency > 500) {
 145                                                         /* clear frequency count before
 146                                                            recompilation */
 147
 148                                                         code->frequency = 0;
 149
 150                                                         /* add this method to the method list and
 151                                                            start recompilation */
 152
 153                                                         recompile_queue_method(m);
 154                                                 }
 155                                         }
 156                                 }
 157                         }
 158                 }
 159
 160                 /* unlock the threads lists */
 161
 162                 threads_list_unlock();
 163         }
 164 }
 165 #endif
 166
 167
 168 /* profile_start_thread ********************************************************
 169
 170    Starts the profile sampling thread.
 171
 172 *******************************************************************************/
 173
 174 #if defined(ENABLE_THREADS)
 175 bool profile_start_thread(void)
 176 {
 177         utf *name;
 178
 179         name = utf_new_char("Profiling Sampler");
 180
 181         if (!threads_thread_start_internal(name, profile_thread))
 182                 return false;
 183
 184         /* everything's ok */
 185
 186         return true;
 187 }
 188 #endif
 189
 190
 191 /* profile_printstats **********************************************************
 192
 193    Prints profiling statistics gathered during runtime.
 194
 195 *******************************************************************************/
 196
 197 #if !defined(NDEBUG)
 198 void profile_printstats(void)
 199 {
 200         list_t                 *l;
 201         list_method_entry      *lme;
 202         list_method_entry      *tlme;
 203         classinfo              *c;
 204         methodinfo             *m;
 205         codeinfo               *code;
 206         u4                      slot;
 207         classcache_name_entry  *nmen;
 208         classcache_class_entry *clsen;
 209         s4                      i;
 210         s4                      j;
 211         u4                      frequency;
 212         s8                      cycles;
 213
 214         frequency = 0;
 215         cycles    = 0;
 216
 217         /* create new method list */
 218
 219         l = list_create(OFFSET(list_method_entry, linkage));
 220
 221         /* iterate through all classes and methods */
 222
 223         for (slot = 0; slot < hashtable_classcache.size; slot++) {
 224                 nmen = (classcache_name_entry *) hashtable_classcache.ptr[slot];
 225
 226                 for (; nmen; nmen = nmen->hashlink) {
 227                         /* iterate over all class entries */
 228
 229                         for (clsen = nmen->classes; clsen; clsen = clsen->next) {
 230                                 c = clsen->classobj;
 231
 232                                 if (c == NULL)
 233                                         continue;
 234
 235                                 /* interate over all class methods */
 236
 237                                 for (i = 0; i < c->methodscount; i++) {
 238                                         m = &(c->methods[i]);
 239
 240                                         code = m->code;
 241
 242                                         /* was this method actually called? */
 243
 244                                         if ((code != NULL) && (code->frequency > 0)) {
 245                                                 /* add to overall stats */
 246
 247                                                 frequency += code->frequency;
 248                                                 cycles    += code->cycles;
 249
 250                                                 /* create new list entry */
 251
 252                                                 lme = NEW(list_method_entry);
 253                                                 lme->m = m;
 254
 255                                                 /* sort the new entry into the list */
 256
 257                                                 if ((tlme = list_first(l)) == NULL) {
 258                                                         list_add_first(l, lme);
 259                                                 }
 260                                                 else {
 261                                                         for (; tlme != NULL; tlme = list_next(l, tlme)) {
 262                                                                 /* check the frequency */
 263
 264                                                                 if (code->frequency > tlme->m->code->frequency) {
 265                                                                         list_add_before(l, tlme, lme);
 266                                                                         break;
 267                                                                 }
 268                                                         }
 269
 270                                                         /* if we are at the end of the list, add
 271                                                            it as last entry */
 272
 273                                                         if (tlme == NULL)
 274                                                                 list_add_last(l, lme);
 275                                                 }
 276                                         }
 277                                 }
 278                         }
 279                 }
 280         }
 281
 282         /* print all methods sorted */
 283
 284         printf(" frequency     ratio         cycles     ratio   method name\n");
 285         printf("----------- --------- -------------- --------- -------------\n");
 286
 287         /* now iterate through the list and print it */
 288
 289         for (lme = list_first(l); lme != NULL; lme = list_next(l, lme)) {
 290                 /* get method of the list element */
 291
 292                 m = lme->m;
 293
 294                 code = m->code;
 295
 296                 printf("%10d   %.5f   %12ld   %.5f   ",
 297                            code->frequency,
 298                            (double) code->frequency / (double) frequency,
 299                            (long) code->cycles,
 300                            (double) code->cycles / (double) cycles);
 301
 302                 method_println(m);
 303
 304                 /* print basic block frequencies */
 305
 306                 if (opt_prof_bb) {
 307                         for (j = 0; j < code->basicblockcount; j++)
 308                                 printf("                                                    L%03d: %10d\n",
 309                                            j, code->bbfrequency[j]);
 310                 }
 311         }
 312
 313         printf("-----------           -------------- \n");
 314         printf("%10d             %12ld\n", frequency, (long) cycles);
 315
 316         printf("\nruns  : %10d\n", runs);
 317         printf("hits  : %10d\n", hits);
 318         printf("misses: %10d\n", misses);
 319 }
 320 #endif /* !defined(NDEBUG) */
 321
 322
 323 /*
 324  * These are local overrides for various environment variables in Emacs.
 325  * Please do not remove this and leave it at the end of the file, where
 326  * Emacs will automagically detect them.
 327  * ---------------------------------------------------------------------
 328  * Local variables:
 329  * mode: c
 330  * indent-tabs-mode: t
 331  * c-basic-offset: 4
 332  * tab-width: 4
 333  * End:
 334  */