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

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  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 #ifndef SHARE_VM_GC_G1_G1PAGEBASEDVIRTUALSPACE_HPP
  26 #define SHARE_VM_GC_G1_G1PAGEBASEDVIRTUALSPACE_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "memory/memRegion.hpp"
  30 #include "memory/virtualspace.hpp"

  31 #include "utilities/bitMap.hpp"
  32 
  33 class WorkGang;
  34 
  35 // Virtual space management helper for a virtual space with an OS page allocation
  36 // granularity.
  37 // (De-)Allocation requests are always OS page aligned by passing a page index
  38 // and multiples of pages.
  39 // For systems that only commits of memory in a given size (always greater than
  40 // page size) the base address is required to be aligned to that page size.
  41 // The actual size requested need not be aligned to that page size, but the size
  42 // of the reservation passed may be rounded up to this page size. Any fragment
  43 // (less than the page size) of the actual size at the tail of the request will
  44 // be committed using OS small pages.
  45 // The implementation gives an error when trying to commit or uncommit pages that
  46 // have already been committed or uncommitted.
  47 class G1PageBasedVirtualSpace VALUE_OBJ_CLASS_SPEC {
  48   friend class VMStructs;
  49  private:
  50   // Reserved area addresses.




  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 #ifndef SHARE_VM_GC_G1_G1PAGEBASEDVIRTUALSPACE_HPP
  26 #define SHARE_VM_GC_G1_G1PAGEBASEDVIRTUALSPACE_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "memory/memRegion.hpp"
  30 #include "memory/virtualspace.hpp"
  31 #include "utilities/align.hpp"
  32 #include "utilities/bitMap.hpp"
  33 
  34 class WorkGang;
  35 
  36 // Virtual space management helper for a virtual space with an OS page allocation
  37 // granularity.
  38 // (De-)Allocation requests are always OS page aligned by passing a page index
  39 // and multiples of pages.
  40 // For systems that only commits of memory in a given size (always greater than
  41 // page size) the base address is required to be aligned to that page size.
  42 // The actual size requested need not be aligned to that page size, but the size
  43 // of the reservation passed may be rounded up to this page size. Any fragment
  44 // (less than the page size) of the actual size at the tail of the request will
  45 // be committed using OS small pages.
  46 // The implementation gives an error when trying to commit or uncommit pages that
  47 // have already been committed or uncommitted.
  48 class G1PageBasedVirtualSpace VALUE_OBJ_CLASS_SPEC {
  49   friend class VMStructs;
  50  private:
  51   // Reserved area addresses.


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