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.hpp"
  36 #include "threads/thread.hpp"
  37
  38 #include "vm/jit/builtin.hpp"
  39 #include "vm/class.h"
  40 #include "vm/classcache.h"
  41 #include "vm/method.h"
  42 #include "vm/options.h"
  43 #include "vm/string.hpp"
  44
  45 #include "vm/jit/jit.hpp"
  46 #include "vm/jit/methodheader.h"
  47 #include "vm/jit/methodtree.h"
  48
  49 #include "vm/jit/optimizing/recompiler.hpp"
  50
  51
  52 /* profile_init ****************************************************************
  53
  54    Initializes the profile global lock.
  55
  56 *******************************************************************************/
  57
  58 bool profile_init(void)
  59 {
  60         /* everything's ok */
  61
  62         return true;
  63 }
  64
  65
  66 /* profile_thread **************************************************************
  67
  68    XXX
  69
  70 *******************************************************************************/
  71
  72 static s4 runs = 0;
  73 static s4 hits = 0;
  74 static s4 misses = 0;
  75
  76 #if defined(ENABLE_THREADS)
  77 static void profile_thread(void)
  78 {
  79         threadobject *t;
  80         s4            nanos;
  81         u1           *pc;
  82         u1           *pv;
  83         methodinfo   *m;
  84         codeinfo     *code;
  85
  86         while (true) {
  87                 /* sleep thread for 0.5-1.0 ms */
  88
  89                 nanos = 500 + (int) (500.0 * (rand() / (RAND_MAX + 1.0)));
  90 /*              fprintf(stderr, "%d\n", nanos); */
  91
  92                 threads_sleep(0, nanos);
  93                 runs++;
  94
  95                 // Lock the thread lists.
  96                 ThreadList_lock();
  97
  98                 /* iterate over all started threads */
  99
 100                 for (t = ThreadList_first(); t != NULL; t = ThreadList_next(t)) {
 101                         /* is this a Java thread? */
 102
 103                         if (!(t->flags & THREAD_FLAG_JAVA))
 104                                 continue;
 105
 106                         /* send SIGUSR2 to thread to get the current PC */
 107                         /* XXX write a threads-function for that */
 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 = methodtree_find_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 NULL
 128                                    (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 and
 148                                                            start recompilation */
 149
 150                                                         Recompiler_queue_method(m);
 151                                                 }
 152                                         }
 153                                 }
 154                         }
 155                 }
 156
 157                 // Unlock the thread lists.
 158                 ThreadList_unlock();
 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         classinfo              *c;
 197         methodinfo             *m;
 198         codeinfo               *code;
 199         u4                      slot;
 200         classcache_name_entry  *nmen;
 201         classcache_class_entry *clsen;
 202         s4                      i;
 203         s4                      j;
 204         u4                      frequency;
 205         s8                      cycles;
 206
 207         frequency = 0;
 208         cycles    = 0;
 209
 210         /* create new method list */
 211         // TODO Use a sorted container.
 212         List* l = List_new();
 213
 214         /* iterate through all classes and methods */
 215
 216         for (slot = 0; slot < hashtable_classcache.size; slot++) {
 217                 nmen = (classcache_name_entry *) hashtable_classcache.ptr[slot];
 218
 219                 for (; nmen; nmen = nmen->hashlink) {
 220                         /* iterate over all class entries */
 221
 222                         for (clsen = nmen->classes; clsen; clsen = clsen->next) {
 223                                 c = clsen->classobj;
 224
 225                                 if (c == NULL)
 226                                         continue;
 227
 228                                 /* interate over all class methods */
 229
 230                                 for (i = 0; i < c->methodscount; i++) {
 231                                         m = &(c->methods[i]);
 232
 233                                         code = m->code;
 234
 235                                         /* was this method actually called? */
 236
 237                                         if ((code != NULL) && (code->frequency > 0)) {
 238                                                 /* add to overall stats */
 239
 240                                                 frequency += code->frequency;
 241                                                 cycles    += code->cycles;
 242
 243                                                 /* sort the new entry into the list */
 244
 245                                                 if (List_empty(l) == NULL) {
 246                                                         List_push_back(l, m);
 247                                                 }
 248                                                 else {
 249                                                         for (; tlme != NULL; tlme = list_next(l, tlme)) {
 250                                                                 /* check the frequency */
 251
 252                                                                 if (code->frequency > tlme->m->code->frequency) {
 253                                                                         list_add_before(l, tlme, lme);
 254                                                                         break;
 255                                                                 }
 256                                                         }
 257
 258                                                         /* if we are at the end of the list, add
 259                                                            it as last entry */
 260
 261                                                         if (tlme == NULL)
 262                                                                 list_add_last(l, lme);
 263                                                 }
 264                                         }
 265                                 }
 266                         }
 267                 }
 268         }
 269
 270         /* print all methods sorted */
 271
 272         printf(" frequency     ratio         cycles     ratio   method name\n");
 273         printf("----------- --------- -------------- --------- -------------\n");
 274
 275         /* now iterate through the list and print it */
 276
 277         for (lme = list_first(l); lme != NULL; lme = list_next(l, lme)) {
 278                 /* get method of the list element */
 279
 280                 m = lme->m;
 281
 282                 code = m->code;
 283
 284                 printf("%10d   %.5f   %12ld   %.5f   ",
 285                            code->frequency,
 286                            (double) code->frequency / (double) frequency,
 287                            (long) code->cycles,
 288                            (double) code->cycles / (double) cycles);
 289
 290                 method_println(m);
 291
 292                 /* print basic block frequencies */
 293
 294                 if (opt_prof_bb) {
 295                         for (j = 0; j < code->basicblockcount; j++)
 296                                 printf("                                                    L%03d: %10d\n",
 297                                            j, code->bbfrequency[j]);
 298                 }
 299         }
 300
 301         printf("-----------           -------------- \n");
 302         printf("%10d             %12ld\n", frequency, (long) cycles);
 303
 304         printf("\nruns  : %10d\n", runs);
 305         printf("hits  : %10d\n", hits);
 306         printf("misses: %10d\n", misses);
 307 }
 308 #endif /* !defined(NDEBUG) */
 309
 310
 311 /*
 312  * These are local overrides for various environment variables in Emacs.
 313  * Please do not remove this and leave it at the end of the file, where
 314  * Emacs will automagically detect them.
 315  * ---------------------------------------------------------------------
 316  * Local variables:
 317  * mode: c
 318  * indent-tabs-mode: t
 319  * c-basic-offset: 4
 320  * tab-width: 4
 321  * End:
 322  */