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src/share/vm/gc/g1/g1AllocRegion.cpp

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   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "gc/g1/g1AllocRegion.inline.hpp"
  27 #include "gc/g1/g1EvacStats.inline.hpp"
  28 #include "gc/g1/g1CollectedHeap.inline.hpp"

  29 #include "runtime/orderAccess.inline.hpp"
  30 
  31 G1CollectedHeap* G1AllocRegion::_g1h = NULL;
  32 HeapRegion* G1AllocRegion::_dummy_region = NULL;
  33 
  34 void G1AllocRegion::setup(G1CollectedHeap* g1h, HeapRegion* dummy_region) {
  35   assert(_dummy_region == NULL, "should be set once");
  36   assert(dummy_region != NULL, "pre-condition");
  37   assert(dummy_region->free() == 0, "pre-condition");
  38 
  39   // Make sure that any allocation attempt on this region will fail
  40   // and will not trigger any asserts.
  41   assert(allocate(dummy_region, 1, false) == NULL, "should fail");
  42   assert(par_allocate(dummy_region, 1, false) == NULL, "should fail");
  43   assert(allocate(dummy_region, 1, true) == NULL, "should fail");
  44   assert(par_allocate(dummy_region, 1, true) == NULL, "should fail");
  45 
  46   _g1h = g1h;
  47   _dummy_region = dummy_region;
  48 }


 177   // We explicitly check that the region is not empty to make sure we
 178   // maintain the "the alloc region cannot be empty" invariant.
 179   assert_alloc_region(alloc_region != NULL && !alloc_region->is_empty(), "pre-condition");
 180 
 181   _alloc_region = alloc_region;
 182   _alloc_region->set_allocation_context(allocation_context());
 183   _count += 1;
 184   trace("updated");
 185 }
 186 
 187 HeapRegion* G1AllocRegion::release() {
 188   trace("releasing");
 189   HeapRegion* alloc_region = _alloc_region;
 190   retire(false /* fill_up */);
 191   assert_alloc_region(_alloc_region == _dummy_region, "post-condition of retire()");
 192   _alloc_region = NULL;
 193   trace("released");
 194   return (alloc_region == _dummy_region) ? NULL : alloc_region;
 195 }
 196 
 197 #if G1_ALLOC_REGION_TRACING
 198 void G1AllocRegion::trace(const char* str, size_t min_word_size, size_t desired_word_size, size_t actual_word_size, HeapWord* result) {
 199   // All the calls to trace that set either just the size or the size
 200   // and the result are considered part of level 2 tracing and are
 201   // skipped during level 1 tracing.
 202   if ((actual_word_size == 0 && result == NULL) || (G1_ALLOC_REGION_TRACING > 1)) {
 203     const size_t buffer_length = 128;
 204     char hr_buffer[buffer_length];
 205     char rest_buffer[buffer_length];
 206 
 207     HeapRegion* alloc_region = _alloc_region;
 208     if (alloc_region == NULL) {
 209       jio_snprintf(hr_buffer, buffer_length, "NULL");
 210     } else if (alloc_region == _dummy_region) {
 211       jio_snprintf(hr_buffer, buffer_length, "DUMMY");
 212     } else {
 213       jio_snprintf(hr_buffer, buffer_length,
 214                    HR_FORMAT, HR_FORMAT_PARAMS(alloc_region));
 215     }
 216 
 217     if (G1_ALLOC_REGION_TRACING > 1) {
 218       if (result != NULL) {
 219         jio_snprintf(rest_buffer, buffer_length, "min " SIZE_FORMAT " desired " SIZE_FORMAT " actual " SIZE_FORMAT " " PTR_FORMAT,
 220                      min_word_size, desired_word_size, actual_word_size, result);
 221       } else if (min_word_size != 0) {
 222         jio_snprintf(rest_buffer, buffer_length, "min " SIZE_FORMAT " desired " SIZE_FORMAT, min_word_size, desired_word_size);


 223       } else {
 224         jio_snprintf(rest_buffer, buffer_length, "");
 225       }







 226     } else {
 227       jio_snprintf(rest_buffer, buffer_length, "");
 228     }
 229 
 230     tty->print_cr("[%s] %u %s : %s %s",
 231                   _name, _count, hr_buffer, str, rest_buffer);









 232   }
 233 }
 234 #endif // G1_ALLOC_REGION_TRACING
 235 
 236 G1AllocRegion::G1AllocRegion(const char* name,
 237                              bool bot_updates)
 238   : _name(name), _bot_updates(bot_updates),
 239     _alloc_region(NULL), _count(0), _used_bytes_before(0),
 240     _allocation_context(AllocationContext::system()) { }
 241 
 242 
 243 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size,
 244                                                     bool force) {
 245   return _g1h->new_mutator_alloc_region(word_size, force);
 246 }
 247 
 248 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region,
 249                                        size_t allocated_bytes) {
 250   _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes);
 251 }
 252 
 253 HeapRegion* G1GCAllocRegion::allocate_new_region(size_t word_size,
 254                                                  bool force) {




   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "gc/g1/g1AllocRegion.inline.hpp"
  27 #include "gc/g1/g1EvacStats.inline.hpp"
  28 #include "gc/g1/g1CollectedHeap.inline.hpp"
  29 #include "memory/resourceArea.hpp"
  30 #include "runtime/orderAccess.inline.hpp"
  31 
  32 G1CollectedHeap* G1AllocRegion::_g1h = NULL;
  33 HeapRegion* G1AllocRegion::_dummy_region = NULL;
  34 
  35 void G1AllocRegion::setup(G1CollectedHeap* g1h, HeapRegion* dummy_region) {
  36   assert(_dummy_region == NULL, "should be set once");
  37   assert(dummy_region != NULL, "pre-condition");
  38   assert(dummy_region->free() == 0, "pre-condition");
  39 
  40   // Make sure that any allocation attempt on this region will fail
  41   // and will not trigger any asserts.
  42   assert(allocate(dummy_region, 1, false) == NULL, "should fail");
  43   assert(par_allocate(dummy_region, 1, false) == NULL, "should fail");
  44   assert(allocate(dummy_region, 1, true) == NULL, "should fail");
  45   assert(par_allocate(dummy_region, 1, true) == NULL, "should fail");
  46 
  47   _g1h = g1h;
  48   _dummy_region = dummy_region;
  49 }


 178   // We explicitly check that the region is not empty to make sure we
 179   // maintain the "the alloc region cannot be empty" invariant.
 180   assert_alloc_region(alloc_region != NULL && !alloc_region->is_empty(), "pre-condition");
 181 
 182   _alloc_region = alloc_region;
 183   _alloc_region->set_allocation_context(allocation_context());
 184   _count += 1;
 185   trace("updated");
 186 }
 187 
 188 HeapRegion* G1AllocRegion::release() {
 189   trace("releasing");
 190   HeapRegion* alloc_region = _alloc_region;
 191   retire(false /* fill_up */);
 192   assert_alloc_region(_alloc_region == _dummy_region, "post-condition of retire()");
 193   _alloc_region = NULL;
 194   trace("released");
 195   return (alloc_region == _dummy_region) ? NULL : alloc_region;
 196 }
 197 
 198 #ifndef PRODUCT
 199 void G1AllocRegion::trace(const char* str, size_t min_word_size, size_t desired_word_size, size_t actual_word_size, HeapWord* result) {
 200   // All the calls to trace that set either just the size or the size
 201   // and the result are considered part of detailed tracing and are
 202   // skipped during other tracing.




 203 
 204   if (!log_develop_is_enabled(Debug, gc, alloc, region)) {
 205     return;






 206   }
 207 
 208   bool detailed_info = log_develop_is_enabled(Trace, gc, alloc, region);
 209 
 210   if ((actual_word_size == 0 && result == NULL) || detailed_info) {
 211     LogHandle(gc, alloc, region) log;
 212     ResourceMark rm;
 213     outputStream* out;
 214     if (detailed_info) {
 215       out = log.trace_stream();
 216     } else {
 217       out = log.debug_stream();
 218     }
 219 
 220     out->print("%s: %u ", _name, _count);
 221 
 222     if (_alloc_region == NULL) {
 223       out->print("NULL");
 224     } else if (_alloc_region == _dummy_region) {
 225       out->print("DUMMY");
 226     } else {
 227       out->print(HR_FORMAT, HR_FORMAT_PARAMS(_alloc_region));
 228     }
 229 
 230     out->print(" : %s", str);
 231 
 232     if (detailed_info) {
 233       if (result != NULL) {
 234         out->print(" min " SIZE_FORMAT " desired " SIZE_FORMAT " actual " SIZE_FORMAT " " PTR_FORMAT,
 235                      min_word_size, desired_word_size, actual_word_size, p2i(result));
 236       } else if (min_word_size != 0) {
 237         out->print(" min " SIZE_FORMAT " desired " SIZE_FORMAT, min_word_size, desired_word_size);
 238       }
 239     }
 240     out->cr();
 241   }
 242 }
 243 #endif // PRODUCT
 244 
 245 G1AllocRegion::G1AllocRegion(const char* name,
 246                              bool bot_updates)
 247   : _name(name), _bot_updates(bot_updates),
 248     _alloc_region(NULL), _count(0), _used_bytes_before(0),
 249     _allocation_context(AllocationContext::system()) { }
 250 
 251 
 252 HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size,
 253                                                     bool force) {
 254   return _g1h->new_mutator_alloc_region(word_size, force);
 255 }
 256 
 257 void MutatorAllocRegion::retire_region(HeapRegion* alloc_region,
 258                                        size_t allocated_bytes) {
 259   _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes);
 260 }
 261 
 262 HeapRegion* G1GCAllocRegion::allocate_new_region(size_t word_size,
 263                                                  bool force) {


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