view src/share/vm/gc_implementation/g1/heapRegionSeq.inline.hpp @ 3766:c3f1170908be

7045330: G1: Simplify/fix the HeapRegionSeq class 7042285: G1: native memory leak during humongous object allocation 6804436: G1: heap region indices should be size_t Summary: A series of fixes and improvements to the HeapRegionSeq class: a) replace the _regions growable array with a standard C array, b) avoid de-allocating / re-allocating HeapRegion instances when the heap shrinks / grows (fix for 7042285), c) introduce fast method to map address to HeapRegion via a "biased" array pointer, d) embed the _hrs object in G1CollectedHeap, instead of pointing to it via an indirection, e) assume that all the regions added to the HeapRegionSeq instance are contiguous, f) replace int's with size_t's for indexes (and expand that to HeapRegion as part of 6804436), g) remove unnecessary / unused methods, h) rename a couple of fields (_alloc_search_start and _seq_bottom), i) fix iterate_from() not to always start from index 0 irrespective of the region passed to it, j) add a verification method to check the HeapRegionSeq assumptions, k) always call the wrappers for _hrs.iterate(), _hrs_length(), and _hrs.at() from G1CollectedHeap, not those methods directly, and l) unify the code that expands the sequence (by either re-using or creating a new HeapRegion) and make it robust wrt to a HeapRegion allocation failing. Reviewed-by: stefank, johnc, brutisso
author tonyp
date Fri, 10 Jun 2011 13:16:40 -0400
parents f95d63e2154a
children 720b6a76dd9d
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/*
 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP
#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP

#include "gc_implementation/g1/heapRegion.hpp"
#include "gc_implementation/g1/heapRegionSeq.hpp"

inline size_t HeapRegionSeq::addr_to_index_biased(HeapWord* addr) const {
  assert(_heap_bottom <= addr && addr < _heap_end,
         err_msg("addr: "PTR_FORMAT" bottom: "PTR_FORMAT" end: "PTR_FORMAT,
                 addr, _heap_bottom, _heap_end));
  size_t index = (size_t) addr >> _region_shift;
  return index;
}

inline HeapRegion* HeapRegionSeq::addr_to_region_unsafe(HeapWord* addr) const {
  assert(_heap_bottom <= addr && addr < _heap_end,
         err_msg("addr: "PTR_FORMAT" bottom: "PTR_FORMAT" end: "PTR_FORMAT,
                 addr, _heap_bottom, _heap_end));
  size_t index_biased = addr_to_index_biased(addr);
  HeapRegion* hr = _regions_biased[index_biased];
  assert(hr != NULL, "invariant");
  return hr;
}

inline HeapRegion* HeapRegionSeq::addr_to_region(HeapWord* addr) const {
  if (addr != NULL && addr < _heap_end) {
    assert(addr >= _heap_bottom,
          err_msg("addr: "PTR_FORMAT" bottom: "PTR_FORMAT, addr, _heap_bottom));
    return addr_to_region_unsafe(addr);
  }
  return NULL;
}

inline HeapRegion* HeapRegionSeq::at(size_t index) const {
  assert(index < length(), "pre-condition");
  HeapRegion* hr = _regions[index];
  assert(hr != NULL, "sanity");
  assert(hr->hrs_index() == index, "sanity");
  return hr;
}

#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP