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

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rev 7192 : [mq]: 8058354-fix


  36 #ifdef TARGET_OS_FAMILY_windows
  37 # include "os_windows.inline.hpp"
  38 #endif
  39 #ifdef TARGET_OS_FAMILY_aix
  40 # include "os_aix.inline.hpp"
  41 #endif
  42 #ifdef TARGET_OS_FAMILY_bsd
  43 # include "os_bsd.inline.hpp"
  44 #endif
  45 #include "utilities/bitMap.inline.hpp"
  46 
  47 G1PageBasedVirtualSpace::G1PageBasedVirtualSpace(ReservedSpace rs, size_t used_size, size_t page_size) :
  48   _low_boundary(NULL), _high_boundary(NULL), _committed(), _page_size(0), _special(false),
  49   _dirty(), _executable(false) {
  50   initialize_with_page_size(rs, used_size, page_size);
  51 }
  52 
  53 void G1PageBasedVirtualSpace::initialize_with_page_size(ReservedSpace rs, size_t used_size, size_t page_size) {
  54   guarantee(rs.is_reserved(), "Given reserved space must have been reserved already.");
  55 
  56   vmassert(_low_boundary == NULL, "VirtualSpace already initialized");
  57   vmassert(page_size > 0, "Page size must be non-zero.");
  58 
  59   guarantee(is_ptr_aligned(rs.base(), page_size),
  60             err_msg("Reserved space base " PTR_FORMAT " is not aligned to requested page size " SIZE_FORMAT, p2i(rs.base()), page_size));
  61   guarantee(is_size_aligned(used_size, os::vm_page_size()),
  62             err_msg("Given used reserved space size needs to be OS page size aligned (%d bytes) but is " SIZE_FORMAT, os::vm_page_size(), used_size));
  63   guarantee(used_size <= rs.size(),
  64             err_msg("Used size of reserved space " SIZE_FORMAT " bytes is smaller than reservation at " SIZE_FORMAT " bytes", used_size, rs.size()));
  65   guarantee(is_size_aligned(rs.size(), page_size),
  66             err_msg("Expected that the virtual space is size aligned, but " SIZE_FORMAT " is not aligned to page size " SIZE_FORMAT, rs.size(), page_size));
  67 
  68   _low_boundary  = rs.base();
  69   _high_boundary = _low_boundary + used_size;
  70 
  71   _special = rs.special();
  72   _executable = rs.executable();
  73 
  74   _page_size = page_size;
  75 
  76   vmassert(_committed.size() == 0, "virtual space initialized more than once");
  77   BitMap::idx_t size_in_pages = rs.size() / page_size;
  78   _committed.resize(size_in_pages, /* in_resource_area */ false);
  79   if (_special) {
  80     _dirty.resize(size_in_pages, /* in_resource_area */ false);
  81   }
  82 
  83   _tail_size = used_size % _page_size;
  84 }
  85 
  86 G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() {
  87   release();
  88 }
  89 
  90 void G1PageBasedVirtualSpace::release() {
  91   // This does not release memory it never reserved.
  92   // Caller must release via rs.release();
  93   _low_boundary           = NULL;
  94   _high_boundary          = NULL;
  95   _special                = false;
  96   _executable             = false;


 100   _dirty.resize(0, false);
 101 }
 102 
 103 size_t G1PageBasedVirtualSpace::committed_size() const {
 104   size_t result = _committed.count_one_bits() * _page_size;
 105   // The last page might not be in full.
 106   if (is_last_page_partial() && _committed.at(_committed.size() - 1)) {
 107     result -= _page_size - _tail_size;
 108   }
 109   return result;
 110 }
 111 
 112 size_t G1PageBasedVirtualSpace::reserved_size() const {
 113   return pointer_delta(_high_boundary, _low_boundary, sizeof(char));
 114 }
 115 
 116 size_t G1PageBasedVirtualSpace::uncommitted_size()  const {
 117   return reserved_size() - committed_size();
 118 }
 119 
 120 uintptr_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const {
 121   return (addr - _low_boundary) / _page_size;
 122 }
 123 
 124 bool G1PageBasedVirtualSpace::is_area_committed(uintptr_t start, size_t size_in_pages) const {
 125   uintptr_t end = start + size_in_pages;
 126   return _committed.get_next_zero_offset(start, end) >= end;
 127 }
 128 
 129 bool G1PageBasedVirtualSpace::is_area_uncommitted(uintptr_t start, size_t size_in_pages) const {
 130   uintptr_t end = start + size_in_pages;
 131   return _committed.get_next_one_offset(start, end) >= end;
 132 }
 133 
 134 char* G1PageBasedVirtualSpace::page_start(uintptr_t index) {
 135   return _low_boundary + index * _page_size;
 136 }
 137 
 138 size_t G1PageBasedVirtualSpace::byte_size_for_pages(size_t num) {
 139   return num * _page_size;


 140 }
 141 
 142 bool G1PageBasedVirtualSpace::commit(uintptr_t start, size_t size_in_pages) {



























































 143   // We need to make sure to commit all pages covered by the given area.
 144   guarantee(is_area_uncommitted(start, size_in_pages), "Specified area is not uncommitted");
 145 
 146   bool zero_filled = true;
 147   uintptr_t end = start + size_in_pages;
 148 
 149   if (_special) {
 150     // Check for dirty pages and update zero_filled if any found.
 151     if (_dirty.get_next_one_offset(start,end) < end) {
 152       zero_filled = false;
 153       _dirty.clear_range(start, end);
 154     }
 155   } else {
 156     os::commit_memory_or_exit(page_start(start), byte_size_for_pages(size_in_pages), _executable,
 157                               err_msg("Failed to commit pages from "SIZE_FORMAT" of length "SIZE_FORMAT, start, size_in_pages));
 158   }
 159   _committed.set_range(start, end);
 160 
 161   if (AlwaysPreTouch) {
 162     os::pretouch_memory(page_start(start), page_start(start) + byte_size_for_pages(size_in_pages));
 163   }
 164   return zero_filled;
 165 }
 166 
 167 void G1PageBasedVirtualSpace::uncommit(uintptr_t start, size_t size_in_pages) {
 168   guarantee(is_area_committed(start, size_in_pages), "checking");








 169 

 170   if (_special) {
 171     // Mark that memory is dirty. If committed again the memory might
 172     // need to be cleared explicitly.
 173     _dirty.set_range(start, start + size_in_pages);
 174   } else {
 175     os::uncommit_memory(page_start(start), byte_size_for_pages(size_in_pages));
 176   }
 177 
 178   _committed.clear_range(start, start + size_in_pages);
 179 }
 180 
 181 bool G1PageBasedVirtualSpace::contains(const void* p) const {
 182   return _low_boundary <= (const char*) p && (const char*) p < _high_boundary;
 183 }
 184 
 185 #ifndef PRODUCT
 186 void G1PageBasedVirtualSpace::print_on(outputStream* out) {
 187   out->print   ("Virtual space:");
 188   if (_special) out->print(" (pinned in memory)");
 189   out->cr();
 190   out->print_cr(" - committed: " SIZE_FORMAT, committed_size());
 191   out->print_cr(" - reserved:  " SIZE_FORMAT, reserved_size());
 192   out->print_cr(" - preferred page size: " SIZE_FORMAT, _page_size);
 193   out->print_cr(" - [low_b, high_b]: [" PTR_FORMAT ", " PTR_FORMAT "]",  p2i(_low_boundary), p2i(_high_boundary));
 194 }
 195 
 196 void G1PageBasedVirtualSpace::print() {
 197   print_on(tty);
 198 }


  36 #ifdef TARGET_OS_FAMILY_windows
  37 # include "os_windows.inline.hpp"
  38 #endif
  39 #ifdef TARGET_OS_FAMILY_aix
  40 # include "os_aix.inline.hpp"
  41 #endif
  42 #ifdef TARGET_OS_FAMILY_bsd
  43 # include "os_bsd.inline.hpp"
  44 #endif
  45 #include "utilities/bitMap.inline.hpp"
  46 
  47 G1PageBasedVirtualSpace::G1PageBasedVirtualSpace(ReservedSpace rs, size_t used_size, size_t page_size) :
  48   _low_boundary(NULL), _high_boundary(NULL), _committed(), _page_size(0), _special(false),
  49   _dirty(), _executable(false) {
  50   initialize_with_page_size(rs, used_size, page_size);
  51 }
  52 
  53 void G1PageBasedVirtualSpace::initialize_with_page_size(ReservedSpace rs, size_t used_size, size_t page_size) {
  54   guarantee(rs.is_reserved(), "Given reserved space must have been reserved already.");
  55 
  56   assert(_low_boundary == NULL, "VirtualSpace already initialized");
  57   assert(page_size > 0, "Page size must be non-zero.");
  58 
  59   guarantee(is_ptr_aligned(rs.base(), page_size),
  60             err_msg("Reserved space base " PTR_FORMAT " is not aligned to requested page size " SIZE_FORMAT, p2i(rs.base()), page_size));
  61   guarantee(is_size_aligned(used_size, os::vm_page_size()),
  62             err_msg("Given used reserved space size needs to be OS page size aligned (%d bytes) but is " SIZE_FORMAT, os::vm_page_size(), used_size));
  63   guarantee(used_size <= rs.size(),
  64             err_msg("Used size of reserved space " SIZE_FORMAT " bytes is smaller than reservation at " SIZE_FORMAT " bytes", used_size, rs.size()));
  65   guarantee(is_size_aligned(rs.size(), page_size),
  66             err_msg("Expected that the virtual space is size aligned, but " SIZE_FORMAT " is not aligned to page size " SIZE_FORMAT, rs.size(), page_size));
  67 
  68   _low_boundary  = rs.base();
  69   _high_boundary = _low_boundary + used_size;
  70 
  71   _special = rs.special();
  72   _executable = rs.executable();
  73 
  74   _page_size = page_size;
  75 
  76   assert(_committed.size() == 0, "virtual space initialized more than once");
  77   BitMap::idx_t size_in_pages = rs.size() / page_size;
  78   _committed.resize(size_in_pages, /* in_resource_area */ false);
  79   if (_special) {
  80     _dirty.resize(size_in_pages, /* in_resource_area */ false);
  81   }
  82 
  83   _tail_size = used_size % _page_size;
  84 }
  85 
  86 G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() {
  87   release();
  88 }
  89 
  90 void G1PageBasedVirtualSpace::release() {
  91   // This does not release memory it never reserved.
  92   // Caller must release via rs.release();
  93   _low_boundary           = NULL;
  94   _high_boundary          = NULL;
  95   _special                = false;
  96   _executable             = false;


 100   _dirty.resize(0, false);
 101 }
 102 
 103 size_t G1PageBasedVirtualSpace::committed_size() const {
 104   size_t result = _committed.count_one_bits() * _page_size;
 105   // The last page might not be in full.
 106   if (is_last_page_partial() && _committed.at(_committed.size() - 1)) {
 107     result -= _page_size - _tail_size;
 108   }
 109   return result;
 110 }
 111 
 112 size_t G1PageBasedVirtualSpace::reserved_size() const {
 113   return pointer_delta(_high_boundary, _low_boundary, sizeof(char));
 114 }
 115 
 116 size_t G1PageBasedVirtualSpace::uncommitted_size()  const {
 117   return reserved_size() - committed_size();
 118 }
 119 
 120 size_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const {
 121   return (addr - _low_boundary) / _page_size;
 122 }
 123 
 124 bool G1PageBasedVirtualSpace::is_area_committed(size_t start_page, size_t size_in_pages) const {
 125   size_t end_page = start_page + size_in_pages;
 126   return _committed.get_next_zero_offset(start_page, end_page) >= end_page;
 127 }
 128 
 129 bool G1PageBasedVirtualSpace::is_area_uncommitted(size_t start_page, size_t size_in_pages) const {
 130   size_t end_page = start_page + size_in_pages;
 131   return _committed.get_next_one_offset(start_page, end_page) >= end_page;
 132 }
 133 
 134 char* G1PageBasedVirtualSpace::page_start(size_t index) const {
 135   return _low_boundary + index * _page_size;
 136 }
 137 
 138 bool G1PageBasedVirtualSpace::is_after_last_page(size_t index) const {
 139   guarantee(index <= _committed.size(),
 140             err_msg("Given boundary page " SIZE_FORMAT " is beyond managed page count " SIZE_FORMAT, index, _committed.size()));
 141   return index == _committed.size();
 142 }
 143 
 144 void G1PageBasedVirtualSpace::commit_preferred_pages(size_t start, size_t num_pages) {
 145   assert(num_pages > 0, "No full pages to commit");
 146   assert(start + num_pages <= _committed.size(),
 147            err_msg("Tried to commit area from page " SIZE_FORMAT " to page " SIZE_FORMAT " "
 148                    "that is outside of managed space of " SIZE_FORMAT " pages",
 149                    start, start + num_pages, _committed.size()));
 150 
 151   char* start_addr = page_start(start);
 152   size_t size = num_pages * _page_size;
 153 
 154   os::commit_memory_or_exit(start_addr, size, _page_size, _executable,
 155                             err_msg("Failed to commit area from " PTR_FORMAT " to " PTR_FORMAT " of length " SIZE_FORMAT ".",
 156                                     p2i(start_addr), p2i(start_addr + size), size));
 157 }
 158 
 159 void G1PageBasedVirtualSpace::commit_tail() {
 160   assert(_tail_size > 0, "The size of the tail area must be > 0 when reaching here");
 161 
 162   char* const aligned_end_address = (char*)align_ptr_down(_high_boundary, _page_size);
 163   os::commit_memory_or_exit(aligned_end_address, _tail_size, os::vm_page_size(), _executable,
 164                             err_msg("Failed to commit tail area from " PTR_FORMAT " to " PTR_FORMAT " of length " SIZE_FORMAT ".",
 165                                     p2i(aligned_end_address), p2i(_high_boundary), _tail_size));
 166 }
 167 
 168 void G1PageBasedVirtualSpace::commit_internal(size_t start_page, size_t end_page) {
 169   guarantee(start_page < end_page,
 170             err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page));
 171   guarantee(end_page <= _committed.size(),
 172             err_msg("Given end page " SIZE_FORMAT " is beyond end of managed page amount of " SIZE_FORMAT, end_page, _committed.size()));
 173 
 174   size_t pages = end_page - start_page;
 175   bool need_to_commit_tail = is_after_last_page(end_page) && is_last_page_partial();
 176 
 177   // If we have to commit some (partial) tail area, decrease the amount of pages to avoid
 178   // committing that in the full-page commit code.
 179   if (need_to_commit_tail) {
 180     pages--;
 181   }
 182 
 183   if (pages > 0) {
 184     commit_preferred_pages(start_page, pages);
 185   }
 186 
 187   if (need_to_commit_tail) {
 188     commit_tail();
 189   }
 190 }
 191 
 192 char* G1PageBasedVirtualSpace::bounded_end_addr(size_t end_page) const {
 193   return MIN2(_high_boundary, page_start(end_page));
 194 }
 195 
 196 void G1PageBasedVirtualSpace::pretouch_internal(size_t start_page, size_t end_page) {
 197   guarantee(start_page < end_page,
 198             err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page));
 199 
 200   os::pretouch_memory(page_start(start_page), bounded_end_addr(end_page));
 201 }
 202 
 203 bool G1PageBasedVirtualSpace::commit(size_t start_page, size_t size_in_pages) {
 204   // We need to make sure to commit all pages covered by the given area.
 205   guarantee(is_area_uncommitted(start_page, size_in_pages), "Specified area is not uncommitted");
 206 
 207   bool zero_filled = true;
 208   size_t end_page = start_page + size_in_pages;
 209 
 210   if (_special) {
 211     // Check for dirty pages and update zero_filled if any found.
 212     if (_dirty.get_next_one_offset(start_page, end_page) < end_page) {
 213       zero_filled = false;
 214       _dirty.clear_range(start_page, end_page);
 215     }
 216   } else {
 217     commit_internal(start_page, end_page);

 218   }
 219   _committed.set_range(start_page, end_page);
 220 
 221   if (AlwaysPreTouch) {
 222     pretouch_internal(start_page, end_page);
 223   }
 224   return zero_filled;
 225 }
 226 
 227 void G1PageBasedVirtualSpace::uncommit_internal(size_t start_page, size_t end_page) {
 228   guarantee(start_page < end_page,
 229             err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page));
 230 
 231   char* start_addr = page_start(start_page);
 232   os::uncommit_memory(start_addr, pointer_delta(bounded_end_addr(end_page), start_addr, sizeof(char)));
 233 }
 234 
 235 void G1PageBasedVirtualSpace::uncommit(size_t start_page, size_t size_in_pages) {
 236   guarantee(is_area_committed(start_page, size_in_pages), "checking");
 237 
 238   size_t end_page = start_page + size_in_pages;
 239   if (_special) {
 240     // Mark that memory is dirty. If committed again the memory might
 241     // need to be cleared explicitly.
 242     _dirty.set_range(start_page, end_page);
 243   } else {
 244     uncommit_internal(start_page, end_page);
 245   }
 246 
 247   _committed.clear_range(start_page, end_page);
 248 }
 249 
 250 bool G1PageBasedVirtualSpace::contains(const void* p) const {
 251   return _low_boundary <= (const char*) p && (const char*) p < _high_boundary;
 252 }
 253 
 254 #ifndef PRODUCT
 255 void G1PageBasedVirtualSpace::print_on(outputStream* out) {
 256   out->print   ("Virtual space:");
 257   if (_special) out->print(" (pinned in memory)");
 258   out->cr();
 259   out->print_cr(" - committed: " SIZE_FORMAT, committed_size());
 260   out->print_cr(" - reserved:  " SIZE_FORMAT, reserved_size());
 261   out->print_cr(" - preferred page size: " SIZE_FORMAT, _page_size);
 262   out->print_cr(" - [low_b, high_b]: [" PTR_FORMAT ", " PTR_FORMAT "]",  p2i(_low_boundary), p2i(_high_boundary));
 263 }
 264 
 265 void G1PageBasedVirtualSpace::print() {
 266   print_on(tty);
 267 }
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