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src/hotspot/share/memory/metaspace/metachunk.cpp

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rev 54012 : imported patch autouncommit-metachunks


   6  * under the terms of the GNU General Public License version 2 only, as
   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 "memory/allocation.hpp"
  27 #include "memory/metaspace/metachunk.hpp"
  28 #include "memory/metaspace/occupancyMap.hpp"
  29 #include "memory/metaspace/virtualSpaceNode.hpp"
  30 #include "utilities/align.hpp"
  31 #include "utilities/copy.hpp"
  32 #include "utilities/debug.hpp"
  33 
  34 namespace metaspace {
  35 
  36 size_t Metachunk::object_alignment() {
  37   // Must align pointers and sizes to 8,
  38   // so that 64 bit types get correctly aligned.
  39   const size_t alignment = 8;
  40 
  41   // Make sure that the Klass alignment also agree.
  42   STATIC_ASSERT(alignment == (size_t)KlassAlignmentInBytes);
  43 
  44   return alignment;
  45 }


 116   if (chunk_type != HumongousIndex) {
 117     assert(word_size() == get_size_for_nonhumongous_chunktype(chunk_type, is_class()),
 118            "Chunk " PTR_FORMAT ": wordsize " SIZE_FORMAT " does not fit chunk type %s.",
 119            p2i(this), word_size(), chunk_size_name(chunk_type));
 120   }
 121   assert(is_valid_chunkorigin(get_origin()), "Chunk " PTR_FORMAT ": Invalid chunk origin.", p2i(this));
 122   assert(bottom() <= _top && _top <= (MetaWord*)end(),
 123          "Chunk " PTR_FORMAT ": Chunk top out of chunk bounds.", p2i(this));
 124 
 125   // For non-humongous chunks, starting address shall be aligned
 126   // to its chunk size. Humongous chunks start address is
 127   // aligned to specialized chunk size.
 128   const size_t required_alignment =
 129     (chunk_type != HumongousIndex ? word_size() : get_size_for_nonhumongous_chunktype(SpecializedIndex, is_class())) * sizeof(MetaWord);
 130   assert(is_aligned((address)this, required_alignment),
 131          "Chunk " PTR_FORMAT ": (size " SIZE_FORMAT ") not aligned to " SIZE_FORMAT ".",
 132          p2i(this), word_size() * sizeof(MetaWord), required_alignment);
 133 }
 134 
 135 #endif // ASSERT








































 136 
 137 // Helper, returns a descriptive name for the given index.
 138 const char* chunk_size_name(ChunkIndex index) {
 139   switch (index) {
 140     case SpecializedIndex:
 141       return "specialized";
 142     case SmallIndex:
 143       return "small";
 144     case MediumIndex:
 145       return "medium";
 146     case HumongousIndex:
 147       return "humongous";
 148     default:
 149       return "Invalid index";
 150   }
 151 }
 152 
 153 #ifdef ASSERT
 154 void do_verify_chunk(Metachunk* chunk) {
 155   guarantee(chunk != NULL, "Sanity");


   6  * under the terms of the GNU General Public License version 2 only, as
   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 "logging/log.hpp"
  27 #include "memory/allocation.hpp"
  28 #include "memory/metaspace/metachunk.hpp"
  29 #include "memory/metaspace/occupancyMap.hpp"
  30 #include "memory/metaspace/virtualSpaceNode.hpp"
  31 #include "utilities/align.hpp"
  32 #include "utilities/copy.hpp"
  33 #include "utilities/debug.hpp"
  34 
  35 namespace metaspace {
  36 
  37 size_t Metachunk::object_alignment() {
  38   // Must align pointers and sizes to 8,
  39   // so that 64 bit types get correctly aligned.
  40   const size_t alignment = 8;
  41 
  42   // Make sure that the Klass alignment also agree.
  43   STATIC_ASSERT(alignment == (size_t)KlassAlignmentInBytes);
  44 
  45   return alignment;
  46 }


 117   if (chunk_type != HumongousIndex) {
 118     assert(word_size() == get_size_for_nonhumongous_chunktype(chunk_type, is_class()),
 119            "Chunk " PTR_FORMAT ": wordsize " SIZE_FORMAT " does not fit chunk type %s.",
 120            p2i(this), word_size(), chunk_size_name(chunk_type));
 121   }
 122   assert(is_valid_chunkorigin(get_origin()), "Chunk " PTR_FORMAT ": Invalid chunk origin.", p2i(this));
 123   assert(bottom() <= _top && _top <= (MetaWord*)end(),
 124          "Chunk " PTR_FORMAT ": Chunk top out of chunk bounds.", p2i(this));
 125 
 126   // For non-humongous chunks, starting address shall be aligned
 127   // to its chunk size. Humongous chunks start address is
 128   // aligned to specialized chunk size.
 129   const size_t required_alignment =
 130     (chunk_type != HumongousIndex ? word_size() : get_size_for_nonhumongous_chunktype(SpecializedIndex, is_class())) * sizeof(MetaWord);
 131   assert(is_aligned((address)this, required_alignment),
 132          "Chunk " PTR_FORMAT ": (size " SIZE_FORMAT ") not aligned to " SIZE_FORMAT ".",
 133          p2i(this), word_size() * sizeof(MetaWord), required_alignment);
 134 }
 135 
 136 #endif // ASSERT
 137 
 138 bool Metachunk::calc_uncommit_range(address* start, size_t* len) const {
 139   // All but the first page (which contains the header) can be uncommitted
 140   if (size() * sizeof(MetaWord) > (size_t)os::vm_page_size()) {
 141     address from = align_up((address)initial_top(), os::vm_page_size());
 142     address to = align_down((address)end(), os::vm_page_size());
 143     if (from < to) {
 144       *start = from;
 145       *len = to - from;
 146       return true;
 147     }
 148   }
 149   return false;
 150 }
 151 
 152 bool Metachunk::commit() {
 153   bool rc = false;
 154   address p = NULL; size_t len = 0;
 155   if (calc_uncommit_range(&p, &len)) {
 156     rc = os::commit_memory((char*)p, len, false);
 157     if (rc) {
 158       log_info(gc, metaspace)("Committed chunk " PTR_FORMAT " (payload area from " PTR_FORMAT " to " PTR_FORMAT ")",
 159                               p2i(this), p2i(p), p2i(p + len));
 160     }
 161   }
 162   return rc;
 163 }
 164 
 165 bool Metachunk::uncommit() {
 166   bool rc = false;
 167   address p = NULL; size_t len = 0;
 168   if (calc_uncommit_range(&p, &len)) {
 169     rc = os::uncommit_memory((char*)p, len);
 170     if (rc) {
 171       log_info(gc, metaspace)("Uncommitted chunk " PTR_FORMAT " (payload area from " PTR_FORMAT " to " PTR_FORMAT ")",
 172                               p2i(this), p2i(p), p2i(p + len));
 173     }
 174   }
 175   return rc;
 176 }
 177 
 178 // Helper, returns a descriptive name for the given index.
 179 const char* chunk_size_name(ChunkIndex index) {
 180   switch (index) {
 181     case SpecializedIndex:
 182       return "specialized";
 183     case SmallIndex:
 184       return "small";
 185     case MediumIndex:
 186       return "medium";
 187     case HumongousIndex:
 188       return "humongous";
 189     default:
 190       return "Invalid index";
 191   }
 192 }
 193 
 194 #ifdef ASSERT
 195 void do_verify_chunk(Metachunk* chunk) {
 196   guarantee(chunk != NULL, "Sanity");
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