src/vm/jit/optimizing/profile.c

   1 /* src/vm/jit/optimizing/profile.c - runtime profiling
   2
   3    Copyright (C) 1996-2005, 2006, 2007, 2008
   4    CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
   5
   6    This file is part of CACAO.
   7
   8    This program is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU General Public License as
  10    published by the Free Software Foundation; either version 2, or (at
  11    your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful, but
  14    WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21    02110-1301, USA.
  22
  23 */
  24
  25
  26 #include "config.h"
  27
  28 #include <assert.h>
  29 #include <stdlib.h>
  30
  31 #include "vm/types.h"
  32
  33 #include "mm/memory.h"
  34
  35 #include "threads/threadlist.h"
  36 #include "threads/thread.h"
  37
  38 #include "vm/builtin.h"
  39 #include "vm/stringlocal.h"
  40
  41 #include "vm/jit/jit.h"
  42 #include "vm/jit/methodheader.h"
  43 #include "vm/jit/methodtree.h"
  44
  45 #include "vm/jit/optimizing/recompile.h"
  46
  47 #include "vmcore/class.h"
  48 #include "vmcore/classcache.h"
  49 #include "vmcore/method.h"
  50 #include "vmcore/options.h"
  51
  52
  53 /* profile_init ****************************************************************
  54
  55    Initializes the profile global lock.
  56
  57 *******************************************************************************/
  58
  59 bool profile_init(void)
  60 {
  61         /* everything's ok */
  62
  63         return true;
  64 }
  65
  66
  67 /* profile_thread **************************************************************
  68
  69    XXX
  70
  71 *******************************************************************************/
  72
  73 static s4 runs = 0;
  74 static s4 hits = 0;
  75 static s4 misses = 0;
  76
  77 #if defined(ENABLE_THREADS)
  78 static void profile_thread(void)
  79 {
  80         threadobject *t;
  81         s4            nanos;
  82         u1           *pc;
  83         u1           *pv;
  84         methodinfo   *m;
  85         codeinfo     *code;
  86
  87         while (true) {
  88                 /* sleep thread for 0.5-1.0 ms */
  89
  90                 nanos = 500 + (int) (500.0 * (rand() / (RAND_MAX + 1.0)));
  91 /*              fprintf(stderr, "%d\n", nanos); */
  92
  93                 threads_sleep(0, nanos);
  94                 runs++;
  95
  96                 /* lock the threads lists */
  97
  98                 threadlist_lock();
  99
 100                 /* iterate over all started threads */
 101
 102                 for (t = threadlist_first(); t != NULL; t = threadlist_next(t)) {
 103                         /* is this a Java thread? */
 104
 105                         if (!(t->flags & THREAD_FLAG_JAVA))
 106                                 continue;
 107
 108                         /* send SIGUSR2 to thread to get the current PC */
 109                         /* XXX write a threads-function for that */
 110
 111                         pthread_kill(t->tid, SIGUSR2);
 112
 113                         /* the thread object now contains the current thread PC */
 114
 115                         pc = t->pc;
 116
 117                         /* Get the PV for the current PC. */
 118
 119                         pv = methodtree_find_nocheck(pc);
 120
 121                         /* get methodinfo pointer from data segment */
 122
 123                         if (pv == NULL) {
 124                                 misses++;
 125                         }
 126                         else {
 127                                 code = *((codeinfo **) (pv + CodeinfoPointer));
 128
 129                                 /* For asm_vm_call_method the codeinfo pointer is NULL
 130                                    (which is also in the method tree). */
 131
 132                                 if (code != NULL) {
 133                                         m = code->m;
 134
 135                                         /* native methods are never recompiled */
 136
 137                                         if (!(m->flags & ACC_NATIVE)) {
 138                                                 /* increase the method incovation counter */
 139
 140                                                 code->frequency++;
 141                                                 hits++;
 142
 143                                                 if (code->frequency > 500) {
 144                                                         /* clear frequency count before
 145                                                            recompilation */
 146
 147                                                         code->frequency = 0;
 148
 149                                                         /* add this method to the method list and
 150                                                            start recompilation */
 151
 152                                                         recompile_queue_method(m);
 153                                                 }
 154                                         }
 155                                 }
 156                         }
 157                 }
 158
 159                 /* unlock the threads lists */
 160
 161                 threadlist_unlock();
 162         }
 163 }
 164 #endif
 165
 166
 167 /* profile_start_thread ********************************************************
 168
 169    Starts the profile sampling thread.
 170
 171 *******************************************************************************/
 172
 173 #if defined(ENABLE_THREADS)
 174 bool profile_start_thread(void)
 175 {
 176         utf *name;
 177
 178         name = utf_new_char("Profiling Sampler");
 179
 180         if (!threads_thread_start_internal(name, profile_thread))
 181                 return false;
 182
 183         /* everything's ok */
 184
 185         return true;
 186 }
 187 #endif
 188
 189
 190 /* profile_printstats **********************************************************
 191
 192    Prints profiling statistics gathered during runtime.
 193
 194 *******************************************************************************/
 195
 196 #if !defined(NDEBUG)
 197 void profile_printstats(void)
 198 {
 199         list_t                 *l;
 200         list_method_entry      *lme;
 201         list_method_entry      *tlme;
 202         classinfo              *c;
 203         methodinfo             *m;
 204         codeinfo               *code;
 205         u4                      slot;
 206         classcache_name_entry  *nmen;
 207         classcache_class_entry *clsen;
 208         s4                      i;
 209         s4                      j;
 210         u4                      frequency;
 211         s8                      cycles;
 212
 213         frequency = 0;
 214         cycles    = 0;
 215
 216         /* create new method list */
 217
 218         l = list_create(OFFSET(list_method_entry, linkage));
 219
 220         /* iterate through all classes and methods */
 221
 222         for (slot = 0; slot < hashtable_classcache.size; slot++) {
 223                 nmen = (classcache_name_entry *) hashtable_classcache.ptr[slot];
 224
 225                 for (; nmen; nmen = nmen->hashlink) {
 226                         /* iterate over all class entries */
 227
 228                         for (clsen = nmen->classes; clsen; clsen = clsen->next) {
 229                                 c = clsen->classobj;
 230
 231                                 if (c == NULL)
 232                                         continue;
 233
 234                                 /* interate over all class methods */
 235
 236                                 for (i = 0; i < c->methodscount; i++) {
 237                                         m = &(c->methods[i]);
 238
 239                                         code = m->code;
 240
 241                                         /* was this method actually called? */
 242
 243                                         if ((code != NULL) && (code->frequency > 0)) {
 244                                                 /* add to overall stats */
 245
 246                                                 frequency += code->frequency;
 247                                                 cycles    += code->cycles;
 248
 249                                                 /* create new list entry */
 250
 251                                                 lme = NEW(list_method_entry);
 252                                                 lme->m = m;
 253
 254                                                 /* sort the new entry into the list */
 255
 256                                                 if ((tlme = list_first(l)) == NULL) {
 257                                                         list_add_first(l, lme);
 258                                                 }
 259                                                 else {
 260                                                         for (; tlme != NULL; tlme = list_next(l, tlme)) {
 261                                                                 /* check the frequency */
 262
 263                                                                 if (code->frequency > tlme->m->code->frequency) {
 264                                                                         list_add_before(l, tlme, lme);
 265                                                                         break;
 266                                                                 }
 267                                                         }
 268
 269                                                         /* if we are at the end of the list, add
 270                                                            it as last entry */
 271
 272                                                         if (tlme == NULL)
 273                                                                 list_add_last(l, lme);
 274                                                 }
 275                                         }
 276                                 }
 277                         }
 278                 }
 279         }
 280
 281         /* print all methods sorted */
 282
 283         printf(" frequency     ratio         cycles     ratio   method name\n");
 284         printf("----------- --------- -------------- --------- -------------\n");
 285
 286         /* now iterate through the list and print it */
 287
 288         for (lme = list_first(l); lme != NULL; lme = list_next(l, lme)) {
 289                 /* get method of the list element */
 290
 291                 m = lme->m;
 292
 293                 code = m->code;
 294
 295                 printf("%10d   %.5f   %12ld   %.5f   ",
 296                            code->frequency,
 297                            (double) code->frequency / (double) frequency,
 298                            (long) code->cycles,
 299                            (double) code->cycles / (double) cycles);
 300
 301                 method_println(m);
 302
 303                 /* print basic block frequencies */
 304
 305                 if (opt_prof_bb) {
 306                         for (j = 0; j < code->basicblockcount; j++)
 307                                 printf("                                                    L%03d: %10d\n",
 308                                            j, code->bbfrequency[j]);
 309                 }
 310         }
 311
 312         printf("-----------           -------------- \n");
 313         printf("%10d             %12ld\n", frequency, (long) cycles);
 314
 315         printf("\nruns  : %10d\n", runs);
 316         printf("hits  : %10d\n", hits);
 317         printf("misses: %10d\n", misses);
 318 }
 319 #endif /* !defined(NDEBUG) */
 320
 321
 322 /*
 323  * These are local overrides for various environment variables in Emacs.
 324  * Please do not remove this and leave it at the end of the file, where
 325  * Emacs will automagically detect them.
 326  * ---------------------------------------------------------------------
 327  * Local variables:
 328  * mode: c
 329  * indent-tabs-mode: t
 330  * c-basic-offset: 4
 331  * tab-width: 4
 332  * End:
 333  */