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: cacao.c 4357 2006-01-22 23:33:38Z 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 "threads/native/threads.h"
  42
  43 #include "vm/builtin.h"
  44 #include "vm/stringlocal.h"
  45
  46 #include "vm/jit/jit.h"
  47 #include "vm/jit/methodheader.h"
  48 #include "vm/jit/optimizing/recompile.h"
  49
  50 #include "vmcore/class.h"
  51 #include "vmcore/classcache.h"
  52 #include "vmcore/method.h"
  53 #include "vmcore/options.h"
  54
  55
  56 /* profile_init ****************************************************************
  57
  58    Initializes the profile global lock.
  59
  60 *******************************************************************************/
  61
  62 bool profile_init(void)
  63 {
  64         /* everything's ok */
  65
  66         return true;
  67 }
  68
  69
  70 /* profile_thread **************************************************************
  71
  72    XXX
  73
  74 *******************************************************************************/
  75
  76 static s4 runs = 0;
  77 static s4 hits = 0;
  78 static s4 misses = 0;
  79
  80 #if defined(ENABLE_THREADS)
  81 static void profile_thread(void)
  82 {
  83         threadobject *t;
  84         s4            nanos;
  85         u1           *pc;
  86         u1           *pv;
  87         methodinfo   *m;
  88         codeinfo     *code;
  89
  90         while (true) {
  91                 /* sleep thread for 0.5-1.0 ms */
  92
  93                 nanos = 500 + (int) (500.0 * (rand() / (RAND_MAX + 1.0)));
  94 /*              fprintf(stderr, "%d\n", nanos); */
  95
  96                 threads_sleep(0, nanos);
  97                 runs++;
  98
  99                 /* iterate over all started threads */
 100
 101                 t = mainthreadobj;
 102
 103                 do {
 104                         /* is this a Java thread? */
 105
 106                         if (t->flags & THREAD_FLAG_JAVA) {
 107                                 /* send SIGUSR2 to thread to get the current PC */
 108
 109                                 pthread_kill(t->tid, SIGUSR2);
 110
 111                                 /* the thread object now contains the current thread PC */
 112
 113                                 pc = t->pc;
 114
 115                                 /* get the PV for the current PC */
 116
 117                                 pv = codegen_get_pv_from_pc_nocheck(pc);
 118
 119                                 /* get methodinfo pointer from data segment */
 120
 121                                 if (pv == NULL) {
 122                                         misses++;
 123                                 }
 124                                 else {
 125                                         code = *((codeinfo **) (pv + CodeinfoPointer));
 126
 127                                         /* For asm_vm_call_method the codeinfo pointer is
 128                                            NULL (which is also in the method tree). */
 129
 130                                         if (code != NULL) {
 131                                                 m = code->m;
 132
 133                                                 /* native methods are never recompiled */
 134
 135                                                 if (!(m->flags & ACC_NATIVE)) {
 136                                                         /* increase the method incovation counter */
 137
 138                                                         code->frequency++;
 139                                                         hits++;
 140
 141                                                         if (code->frequency > 500) {
 142                                                                 /* clear frequency count before
 143                                                                    recompilation */
 144
 145                                                                 code->frequency = 0;
 146
 147                                                                 /* add this method to the method list
 148                                                                    and start recompilation */
 149
 150                                                                 recompile_queue_method(m);
 151                                                         }
 152                                                 }
 153                                         }
 154                                 }
 155                         }
 156
 157                         t = t->next;
 158                 } while ((t != NULL) && (t != mainthreadobj));
 159         }
 160 }
 161 #endif
 162
 163
 164 /* profile_start_thread ********************************************************
 165
 166    Starts the profile sampling thread.
 167
 168 *******************************************************************************/
 169
 170 #if defined(ENABLE_THREADS)
 171 bool profile_start_thread(void)
 172 {
 173         utf *name;
 174
 175         name = utf_new_char("Profiling Sampler");
 176
 177         if (!threads_thread_start_internal(name, profile_thread))
 178                 return false;
 179
 180         /* everything's ok */
 181
 182         return true;
 183 }
 184 #endif
 185
 186
 187 /* profile_printstats **********************************************************
 188
 189    Prints profiling statistics gathered during runtime.
 190
 191 *******************************************************************************/
 192
 193 #if !defined(NDEBUG)
 194 void profile_printstats(void)
 195 {
 196         list_t                 *l;
 197         list_method_entry      *lme;
 198         list_method_entry      *tlme;
 199         classinfo              *c;
 200         methodinfo             *m;
 201         codeinfo               *code;
 202         u4                      slot;
 203         classcache_name_entry  *nmen;
 204         classcache_class_entry *clsen;
 205         s4                      i;
 206         s4                      j;
 207         u4                      frequency;
 208         s8                      cycles;
 209
 210         frequency = 0;
 211         cycles    = 0;
 212
 213         /* create new method list */
 214
 215         l = list_create(OFFSET(list_method_entry, linkage));
 216
 217         /* iterate through all classes and methods */
 218
 219         for (slot = 0; slot < hashtable_classcache.size; slot++) {
 220                 nmen = (classcache_name_entry *) hashtable_classcache.ptr[slot];
 221
 222                 for (; nmen; nmen = nmen->hashlink) {
 223                         /* iterate over all class entries */
 224
 225                         for (clsen = nmen->classes; clsen; clsen = clsen->next) {
 226                                 c = clsen->classobj;
 227
 228                                 if (c == NULL)
 229                                         continue;
 230
 231                                 /* interate over all class methods */
 232
 233                                 for (i = 0; i < c->methodscount; i++) {
 234                                         m = &(c->methods[i]);
 235
 236                                         code = m->code;
 237
 238                                         /* was this method actually called? */
 239
 240                                         if ((code != NULL) && (code->frequency > 0)) {
 241                                                 /* add to overall stats */
 242
 243                                                 frequency += code->frequency;
 244                                                 cycles    += code->cycles;
 245
 246                                                 /* create new list entry */
 247
 248                                                 lme = NEW(list_method_entry);
 249                                                 lme->m = m;
 250
 251                                                 /* sort the new entry into the list */
 252
 253                                                 if ((tlme = list_first(l)) == NULL) {
 254                                                         list_add_first(l, lme);
 255                                                 }
 256                                                 else {
 257                                                         for (; tlme != NULL; tlme = list_next(l, tlme)) {
 258                                                                 /* check the frequency */
 259
 260                                                                 if (code->frequency > tlme->m->code->frequency) {
 261                                                                         list_add_before(l, tlme, lme);
 262                                                                         break;
 263                                                                 }
 264                                                         }
 265
 266                                                         /* if we are at the end of the list, add
 267                                                            it as last entry */
 268
 269                                                         if (tlme == NULL)
 270                                                                 list_add_last(l, lme);
 271                                                 }
 272                                         }
 273                                 }
 274                         }
 275                 }
 276         }
 277
 278         /* print all methods sorted */
 279
 280         printf(" frequency     ratio         cycles     ratio   method name\n");
 281         printf("----------- --------- -------------- --------- -------------\n");
 282
 283         /* now iterate through the list and print it */
 284
 285         for (lme = list_first(l); lme != NULL; lme = list_next(l, lme)) {
 286                 /* get method of the list element */
 287
 288                 m = lme->m;
 289
 290                 code = m->code;
 291
 292                 printf("%10d   %.5f   %12ld   %.5f   ",
 293                            code->frequency,
 294                            (double) code->frequency / (double) frequency,
 295                            (long) code->cycles,
 296                            (double) code->cycles / (double) cycles);
 297
 298                 method_println(m);
 299
 300                 /* print basic block frequencies */
 301
 302                 if (opt_prof_bb) {
 303                         for (j = 0; j < code->basicblockcount; j++)
 304                                 printf("                                                    L%03d: %10d\n",
 305                                            j, code->bbfrequency[j]);
 306                 }
 307         }
 308
 309         printf("-----------           -------------- \n");
 310         printf("%10d             %12ld\n", frequency, (long) cycles);
 311
 312         printf("\nruns  : %10d\n", runs);
 313         printf("hits  : %10d\n", hits);
 314         printf("misses: %10d\n", misses);
 315 }
 316 #endif /* !defined(NDEBUG) */
 317
 318
 319 /*
 320  * These are local overrides for various environment variables in Emacs.
 321  * Please do not remove this and leave it at the end of the file, where
 322  * Emacs will automagically detect them.
 323  * ---------------------------------------------------------------------
 324  * Local variables:
 325  * mode: c
 326  * indent-tabs-mode: t
 327  * c-basic-offset: 4
 328  * tab-width: 4
 329  * End:
 330  */