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src/share/vm/gc/g1/g1PageBasedVirtualSpace.cpp

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rev 11972 : [mq]: 8157952-sangheon-review


   7  * published by the Free Software Foundation.
   8  *
   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/g1PageBasedVirtualSpace.hpp"

  27 #include "oops/markOop.hpp"
  28 #include "oops/oop.inline.hpp"

  29 #include "runtime/os.inline.hpp"
  30 #include "services/memTracker.hpp"
  31 #include "utilities/bitMap.inline.hpp"
  32 
  33 G1PageBasedVirtualSpace::G1PageBasedVirtualSpace(ReservedSpace rs, size_t used_size, size_t page_size) :
  34   _low_boundary(NULL), _high_boundary(NULL), _committed(), _page_size(0), _special(false),
  35   _dirty(), _executable(false) {
  36   initialize_with_page_size(rs, used_size, page_size);
  37 }
  38 
  39 void G1PageBasedVirtualSpace::initialize_with_page_size(ReservedSpace rs, size_t used_size, size_t page_size) {
  40   guarantee(rs.is_reserved(), "Given reserved space must have been reserved already.");
  41 
  42   vmassert(_low_boundary == NULL, "VirtualSpace already initialized");
  43   vmassert(page_size > 0, "Page size must be non-zero.");
  44 
  45   guarantee(is_ptr_aligned(rs.base(), page_size),
  46             "Reserved space base " PTR_FORMAT " is not aligned to requested page size " SIZE_FORMAT, p2i(rs.base()), page_size);
  47   guarantee(is_size_aligned(used_size, os::vm_page_size()),
  48             "Given used reserved space size needs to be OS page size aligned (%d bytes) but is " SIZE_FORMAT, os::vm_page_size(), used_size);


 160     pages--;
 161   }
 162 
 163   if (pages > 0) {
 164     commit_preferred_pages(start_page, pages);
 165   }
 166 
 167   if (need_to_commit_tail) {
 168     commit_tail();
 169   }
 170 }
 171 
 172 char* G1PageBasedVirtualSpace::bounded_end_addr(size_t end_page) const {
 173   return MIN2(_high_boundary, page_start(end_page));
 174 }
 175 
 176 void G1PageBasedVirtualSpace::pretouch_internal(size_t start_page, size_t end_page) {
 177   guarantee(start_page < end_page,
 178             "Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page);
 179 
 180   os::pretouch_memory(page_start(start_page), bounded_end_addr(end_page));
 181 }
 182 
 183 bool G1PageBasedVirtualSpace::commit(size_t start_page, size_t size_in_pages) {
 184   // We need to make sure to commit all pages covered by the given area.
 185   guarantee(is_area_uncommitted(start_page, size_in_pages), "Specified area is not uncommitted");
 186 
 187   bool zero_filled = true;
 188   size_t end_page = start_page + size_in_pages;
 189 
 190   if (_special) {
 191     // Check for dirty pages and update zero_filled if any found.
 192     if (_dirty.get_next_one_offset(start_page, end_page) < end_page) {
 193       zero_filled = false;
 194       _dirty.clear_range(start_page, end_page);
 195     }
 196   } else {
 197     commit_internal(start_page, end_page);
 198   }
 199   _committed.set_range(start_page, end_page);
 200 
 201   if (AlwaysPreTouch) {
 202     pretouch_internal(start_page, end_page);
 203   }
 204   return zero_filled;
 205 }
 206 
 207 void G1PageBasedVirtualSpace::uncommit_internal(size_t start_page, size_t end_page) {
 208   guarantee(start_page < end_page,
 209             "Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page);
 210 
 211   char* start_addr = page_start(start_page);
 212   os::uncommit_memory(start_addr, pointer_delta(bounded_end_addr(end_page), start_addr, sizeof(char)));
 213 }
 214 
 215 void G1PageBasedVirtualSpace::uncommit(size_t start_page, size_t size_in_pages) {
 216   guarantee(is_area_committed(start_page, size_in_pages), "checking");
 217 
 218   size_t end_page = start_page + size_in_pages;
 219   if (_special) {
 220     // Mark that memory is dirty. If committed again the memory might
 221     // need to be cleared explicitly.
 222     _dirty.set_range(start_page, end_page);
 223   } else {
 224     uncommit_internal(start_page, end_page);
 225   }
 226 
 227   _committed.clear_range(start_page, end_page);















































 228 }
 229 
 230 bool G1PageBasedVirtualSpace::contains(const void* p) const {
 231   return _low_boundary <= (const char*) p && (const char*) p < _high_boundary;
 232 }
 233 
 234 #ifndef PRODUCT
 235 void G1PageBasedVirtualSpace::print_on(outputStream* out) {
 236   out->print   ("Virtual space:");
 237   if (_special) out->print(" (pinned in memory)");
 238   out->cr();
 239   out->print_cr(" - committed: " SIZE_FORMAT, committed_size());
 240   out->print_cr(" - reserved:  " SIZE_FORMAT, reserved_size());
 241   out->print_cr(" - preferred page size: " SIZE_FORMAT, _page_size);
 242   out->print_cr(" - [low_b, high_b]: [" PTR_FORMAT ", " PTR_FORMAT "]",  p2i(_low_boundary), p2i(_high_boundary));
 243 }
 244 
 245 void G1PageBasedVirtualSpace::print() {
 246   print_on(tty);
 247 }


   7  * published by the Free Software Foundation.
   8  *
   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/g1PageBasedVirtualSpace.hpp"
  27 #include "gc/shared/workgroup.hpp"
  28 #include "oops/markOop.hpp"
  29 #include "oops/oop.inline.hpp"
  30 #include "runtime/atomic.hpp"
  31 #include "runtime/os.inline.hpp"
  32 #include "services/memTracker.hpp"
  33 #include "utilities/bitMap.inline.hpp"
  34 
  35 G1PageBasedVirtualSpace::G1PageBasedVirtualSpace(ReservedSpace rs, size_t used_size, size_t page_size) :
  36   _low_boundary(NULL), _high_boundary(NULL), _committed(), _page_size(0), _special(false),
  37   _dirty(), _executable(false) {
  38   initialize_with_page_size(rs, used_size, page_size);
  39 }
  40 
  41 void G1PageBasedVirtualSpace::initialize_with_page_size(ReservedSpace rs, size_t used_size, size_t page_size) {
  42   guarantee(rs.is_reserved(), "Given reserved space must have been reserved already.");
  43 
  44   vmassert(_low_boundary == NULL, "VirtualSpace already initialized");
  45   vmassert(page_size > 0, "Page size must be non-zero.");
  46 
  47   guarantee(is_ptr_aligned(rs.base(), page_size),
  48             "Reserved space base " PTR_FORMAT " is not aligned to requested page size " SIZE_FORMAT, p2i(rs.base()), page_size);
  49   guarantee(is_size_aligned(used_size, os::vm_page_size()),
  50             "Given used reserved space size needs to be OS page size aligned (%d bytes) but is " SIZE_FORMAT, os::vm_page_size(), used_size);


 162     pages--;
 163   }
 164 
 165   if (pages > 0) {
 166     commit_preferred_pages(start_page, pages);
 167   }
 168 
 169   if (need_to_commit_tail) {
 170     commit_tail();
 171   }
 172 }
 173 
 174 char* G1PageBasedVirtualSpace::bounded_end_addr(size_t end_page) const {
 175   return MIN2(_high_boundary, page_start(end_page));
 176 }
 177 
 178 void G1PageBasedVirtualSpace::pretouch_internal(size_t start_page, size_t end_page) {
 179   guarantee(start_page < end_page,
 180             "Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page);
 181 
 182   os::pretouch_memory(page_start(start_page), bounded_end_addr(end_page), _page_size);
 183 }
 184 
 185 bool G1PageBasedVirtualSpace::commit(size_t start_page, size_t size_in_pages) {
 186   // We need to make sure to commit all pages covered by the given area.
 187   guarantee(is_area_uncommitted(start_page, size_in_pages), "Specified area is not uncommitted");
 188 
 189   bool zero_filled = true;
 190   size_t end_page = start_page + size_in_pages;
 191 
 192   if (_special) {
 193     // Check for dirty pages and update zero_filled if any found.
 194     if (_dirty.get_next_one_offset(start_page, end_page) < end_page) {
 195       zero_filled = false;
 196       _dirty.clear_range(start_page, end_page);
 197     }
 198   } else {
 199     commit_internal(start_page, end_page);
 200   }
 201   _committed.set_range(start_page, end_page);
 202 



 203   return zero_filled;
 204 }
 205 
 206 void G1PageBasedVirtualSpace::uncommit_internal(size_t start_page, size_t end_page) {
 207   guarantee(start_page < end_page,
 208             "Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page);
 209 
 210   char* start_addr = page_start(start_page);
 211   os::uncommit_memory(start_addr, pointer_delta(bounded_end_addr(end_page), start_addr, sizeof(char)));
 212 }
 213 
 214 void G1PageBasedVirtualSpace::uncommit(size_t start_page, size_t size_in_pages) {
 215   guarantee(is_area_committed(start_page, size_in_pages), "checking");
 216 
 217   size_t end_page = start_page + size_in_pages;
 218   if (_special) {
 219     // Mark that memory is dirty. If committed again the memory might
 220     // need to be cleared explicitly.
 221     _dirty.set_range(start_page, end_page);
 222   } else {
 223     uncommit_internal(start_page, end_page);
 224   }
 225 
 226   _committed.clear_range(start_page, end_page);
 227 }
 228 
 229 class G1PretouchTask : public AbstractGangTask {
 230 private:
 231   char* volatile _cur_addr;
 232   char* const _start_addr;
 233   char* const _end_addr;
 234   size_t const _page_size;
 235 public:
 236   G1PretouchTask(char* start_address, char* end_address, size_t page_size) :
 237     AbstractGangTask("G1 PreTouch",
 238                      Universe::is_fully_initialized() ? GCId::current_raw() :
 239                                                         // During VM initialization there is
 240                                                         // no GC cycle that this task can be
 241                                                         // associated with.
 242                                                         GCId::undefined()),
 243     _cur_addr(start_address),
 244     _start_addr(start_address),
 245     _end_addr(end_address),
 246     _page_size(page_size) {
 247   }
 248 
 249   virtual void work(uint worker_id) {
 250     size_t const actual_chunk_size = MAX2(chunk_size(), _page_size);
 251     while (true) {
 252       char* touch_addr = (char*)Atomic::add_ptr((intptr_t)actual_chunk_size, (volatile void*) &_cur_addr) - actual_chunk_size;
 253       if (touch_addr < _start_addr || touch_addr >= _end_addr) {
 254         break;
 255       }
 256       char* end_addr = touch_addr + MIN2(actual_chunk_size, pointer_delta(_end_addr, touch_addr, sizeof(char)));
 257       os::pretouch_memory(touch_addr, end_addr, _page_size);     
 258     }
 259   }
 260 
 261   static size_t chunk_size() { return PreTouchParallelChunkSize; }
 262 };
 263 
 264 void G1PageBasedVirtualSpace::pretouch(size_t start_page, size_t size_in_pages, WorkGang* pretouch_gang) {
 265   guarantee(pretouch_gang != NULL, "No pretouch gang specified.");
 266 
 267   size_t num_chunks = MAX2((size_t)1, size_in_pages * _page_size / MAX2(G1PretouchTask::chunk_size(), _page_size));
 268 
 269   uint num_workers = MIN2((uint)num_chunks, pretouch_gang->active_workers());
 270   G1PretouchTask cl(page_start(start_page), bounded_end_addr(start_page + size_in_pages), _page_size);
 271   log_debug(gc, heap)("Running %s with %u workers for " SIZE_FORMAT " work units pre-touching " SIZE_FORMAT "B.",
 272                       cl.name(), num_workers, num_chunks, size_in_pages * _page_size);
 273   pretouch_gang->run_task(&cl, num_workers);
 274 }
 275 
 276 bool G1PageBasedVirtualSpace::contains(const void* p) const {
 277   return _low_boundary <= (const char*) p && (const char*) p < _high_boundary;
 278 }
 279 
 280 #ifndef PRODUCT
 281 void G1PageBasedVirtualSpace::print_on(outputStream* out) {
 282   out->print   ("Virtual space:");
 283   if (_special) out->print(" (pinned in memory)");
 284   out->cr();
 285   out->print_cr(" - committed: " SIZE_FORMAT, committed_size());
 286   out->print_cr(" - reserved:  " SIZE_FORMAT, reserved_size());
 287   out->print_cr(" - preferred page size: " SIZE_FORMAT, _page_size);
 288   out->print_cr(" - [low_b, high_b]: [" PTR_FORMAT ", " PTR_FORMAT "]",  p2i(_low_boundary), p2i(_high_boundary));
 289 }
 290 
 291 void G1PageBasedVirtualSpace::print() {
 292   print_on(tty);
 293 }
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