rev 7746 : 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29
Summary: Allow partial use of large pages for auxiliary data structures in G1.
Reviewed-by:
rev 7747 : [mq]: 8058354-jon-fixes

   1 /*
   2  * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   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 "gc_implementation/g1/g1PageBasedVirtualSpace.hpp"
  27 #include "oops/markOop.hpp"
  28 #include "oops/oop.inline.hpp"
  29 #include "services/memTracker.hpp"
  30 #ifdef TARGET_OS_FAMILY_linux
  31 # include "os_linux.inline.hpp"
  32 #endif
  33 #ifdef TARGET_OS_FAMILY_solaris
  34 # include "os_solaris.inline.hpp"
  35 #endif
  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() : _low_boundary(NULL),
  48   _high_boundary(NULL), _committed(), _commit_size(0), _special(false),
  49   _dirty(), _executable(false) {
  50 }
  51 
  52 bool G1PageBasedVirtualSpace::initialize_with_granularity(ReservedSpace rs, size_t actual_size, size_t commit_size) {
  53   if (!rs.is_reserved()) {
  54     return false;  // Allocation failed.
  55   }
  56   assert(_low_boundary == NULL, "VirtualSpace already initialized");
  57   assert(commit_size > 0, "Granularity must be non-zero.");
  58 
  59   guarantee(is_ptr_aligned(rs.base(), commit_size),
  60             err_msg("Reserved space base " PTR_FORMAT" is not aligned to requested page size " SIZE_FORMAT, p2i(rs.base()), commit_size));
  61   guarantee(is_size_aligned(actual_size, os::vm_page_size()),
  62             err_msg("Given actual reserved space size needs to be OS page size aligned (%d bytes) but is " SIZE_FORMAT, os::vm_page_size(), actual_size));
  63   guarantee(actual_size <= rs.size(),
  64             err_msg("Actual size of reserved space " SIZE_FORMAT" bytes is smaller than reservation at " SIZE_FORMAT" bytes", actual_size, rs.size()));
  65 
  66   _low_boundary  = rs.base();
  67   _high_boundary = _low_boundary + actual_size;
  68 
  69   _special = rs.special();
  70   _executable = rs.executable();
  71 
  72   _commit_size = commit_size;
  73 
  74   assert(_committed.size() == 0, "virtual space initialized more than once");
  75   BitMap::idx_t size_in_commit_pages = round_to(rs.size(), commit_size);
  76   _committed.resize(size_in_commit_pages, /* in_resource_area */ false);
  77   if (_special) {
  78     _dirty.resize(size_in_commit_pages, /* in_resource_area */ false);
  79   }
  80 
  81   return true;
  82 }
  83 

  84 G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() {
  85   release();
  86 }
  87 
  88 void G1PageBasedVirtualSpace::release() {
  89   // This does not release memory it never reserved.
  90   // Caller must release via rs.release();
  91   _low_boundary           = NULL;
  92   _high_boundary          = NULL;
  93   _special                = false;
  94   _executable             = false;
  95   _commit_size            = 0;
  96   _committed.resize(0, false);
  97   _dirty.resize(0, false);
  98 }
  99 
 100 size_t G1PageBasedVirtualSpace::committed_size() const {
 101   size_t result = _committed.count_one_bits() * _commit_size;
 102   // The last page might not be in full.
 103   if (_committed.at(_committed.size()-1)) {
 104     result -= pointer_delta((char*)align_ptr_up(_high_boundary, _commit_size), _high_boundary, sizeof(char));
 105   }
 106   return result;
 107 }
 108 
 109 size_t G1PageBasedVirtualSpace::reserved_size() const {
 110   return pointer_delta(_high_boundary, _low_boundary, sizeof(char));
 111 }
 112 
 113 size_t G1PageBasedVirtualSpace::uncommitted_size()  const {
 114   return reserved_size() - committed_size();
 115 }
 116 
 117 uintptr_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const {
 118   return (addr - _low_boundary) / _commit_size;
 119 }
 120 
 121 bool G1PageBasedVirtualSpace::is_area_committed(uintptr_t start, size_t size_in_pages) const {
 122   uintptr_t end = start + size_in_pages;
 123   return _committed.get_next_zero_offset(start, end) >= end;
 124 }
 125 
 126 bool G1PageBasedVirtualSpace::is_area_uncommitted(uintptr_t start, size_t size_in_pages) const {
 127   uintptr_t end = start + size_in_pages;
 128   return _committed.get_next_one_offset(start, end) >= end;
 129 }
 130 
 131 char* G1PageBasedVirtualSpace::page_start(uintptr_t index) {
 132   return _low_boundary + index * _commit_size;
 133 }
 134 
 135 char* G1PageBasedVirtualSpace::page_end(uintptr_t index) {
 136   guarantee(index < _committed.size(), "invariant");
 137   if (index != (_committed.size() - 1)) {
 138     return page_start(index + 1);
 139   }
 140   return _high_boundary;
 141 }
 142 
 143 void G1PageBasedVirtualSpace::commit_internal(char* start, char* end) {
 144   guarantee(start >= _low_boundary && start < _high_boundary,
 145             err_msg("Start address " PTR_FORMAT" is outside of reserved space.", p2i(start)));
 146   guarantee(is_ptr_aligned(start, _commit_size),
 147             err_msg("Start address should be aligned to commit size " SIZE_FORMAT" but got " PTR_FORMAT".",
 148                     _commit_size, p2i(start)));
 149 
 150   guarantee(end >= _low_boundary && end <= _high_boundary,
 151             err_msg("End address " PTR_FORMAT" is outside of reserved space.", p2i(end)));
 152   bool is_high_aligned_to_commit_size = is_ptr_aligned(_high_boundary, _commit_size);
 153   guarantee(is_ptr_aligned(end, is_high_aligned_to_commit_size ? _commit_size : os::vm_page_size()),
 154             err_msg("End address should be aligned to page size " SIZE_FORMAT" but got " PTR_FORMAT".",
 155                     is_high_aligned_to_commit_size ? _commit_size : os::vm_page_size(),
 156                     p2i(end)));
 157   // First try to commit in commit_size chunks.
 158   char* const aligned_end_address = (char*)align_ptr_down(end, _commit_size);
 159   size_t const size = pointer_delta(aligned_end_address, start, sizeof(char));
 160   if (size != 0) {
 161     os::commit_memory_or_exit(start, size, _commit_size, _executable,
 162                               err_msg("Failed to commit area from " PTR_FORMAT" to " PTR_FORMAT" of length " SIZE_FORMAT".",
 163                                       p2i(start), p2i(aligned_end_address), size));
 164   }
 165   // Finally, commit any remaining tail.
 166   if (end != aligned_end_address) {
 167     size_t const tail_size = pointer_delta(end, aligned_end_address, sizeof(char));
 168     guarantee(tail_size < _commit_size,
 169               err_msg("Remaining size " SIZE_FORMAT "must be smaller than commit size of " SIZE_FORMAT, tail_size, _commit_size));
 170     os::commit_memory_or_exit(start, tail_size, _executable,
 171                               err_msg("Failed to commit remainder pages from " PTR_FORMAT" to " PTR_FORMAT" of length "SIZE_FORMAT".",
 172                                       p2i(aligned_end_address), p2i(end), tail_size));
 173   }
 174 }
 175 
 176 bool G1PageBasedVirtualSpace::commit(uintptr_t start, size_t size_in_pages) {
 177   // We need to make sure to commit all pages covered by the given area.
 178   guarantee(is_area_uncommitted(start, size_in_pages), "Specified area is not uncommitted");
 179 
 180   bool zero_filled = true;
 181   uintptr_t end = start + size_in_pages;
 182 
 183   if (_special) {
 184     // Check for dirty pages and update zero_filled if any found.
 185     if (_dirty.get_next_one_offset(start,end) < end) {
 186       zero_filled = false;
 187       _dirty.clear_range(start, end);
 188     }
 189   } else {
 190     commit_internal(page_start(start), page_end(end - 1));

 191   }
 192   _committed.set_range(start, end);
 193 
 194   if (AlwaysPreTouch) {
 195     os::pretouch_memory(page_start(start), page_end(end - 1));
 196   }
 197   return zero_filled;
 198 }
 199 
 200 void G1PageBasedVirtualSpace::uncommit_internal(char* start, char* end) {
 201   os::uncommit_memory(start, pointer_delta(end, start, sizeof(char)));
 202 }
 203 
 204 void G1PageBasedVirtualSpace::uncommit(uintptr_t start, size_t size_in_pages) {
 205   guarantee(is_area_committed(start, size_in_pages), "checking");
 206 
 207   uintptr_t end = start + size_in_pages;
 208   if (_special) {
 209     // Mark that memory is dirty. If committed again the memory might
 210     // need to be cleared explicitly.
 211     _dirty.set_range(start, end);
 212   } else {
 213     uncommit_internal(page_start(start), page_end(end - 1));
 214   }
 215 
 216   _committed.clear_range(start, end);
 217 }
 218 
 219 bool G1PageBasedVirtualSpace::contains(const void* p) const {
 220   return _low_boundary <= (const char*) p && (const char*) p < _high_boundary;
 221 }
 222 
 223 #ifndef PRODUCT
 224 void G1PageBasedVirtualSpace::print_on(outputStream* out) {
 225   out->print   ("Virtual space:");
 226   if (_special) out->print(" (pinned in memory)");
 227   out->cr();
 228   out->print_cr(" - committed: " SIZE_FORMAT, committed_size());
 229   out->print_cr(" - reserved:  " SIZE_FORMAT, reserved_size());
 230   out->print_cr(" - [low_b, high_b]: [" PTR_FORMAT", " PTR_FORMAT"]",  p2i(_low_boundary), p2i(_high_boundary));
 231 }
 232 
 233 void G1PageBasedVirtualSpace::print() {
 234   print_on(tty);
 235 }
 236 #endif
--- EOF ---