hotspot/src/share/vm/gc_implementation/g1/g1CardCounts.cpp
author jwilhelm
Thu, 03 Oct 2013 21:36:29 +0200
changeset 20398 b206c580c45f
parent 20309 7445302daff6
child 22551 9bf46d16dcc6
permissions -rw-r--r--
8025852: Remove unnecessary setters in collector policy classes Summary: Use instance variables directly within the collector policy classes and remove unused setters. Reviewed-by: tschatzl, jcoomes
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/*
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 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "gc_implementation/g1/g1CardCounts.hpp"
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#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
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#include "gc_implementation/g1/g1CollectorPolicy.hpp"
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#include "gc_implementation/g1/g1GCPhaseTimes.hpp"
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#include "memory/cardTableModRefBS.hpp"
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#include "services/memTracker.hpp"
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#include "utilities/copy.hpp"
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void G1CardCounts::clear_range(size_t from_card_num, size_t to_card_num) {
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  if (has_count_table()) {
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    assert(from_card_num >= 0 && from_card_num < _committed_max_card_num,
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           err_msg("from card num out of range: "SIZE_FORMAT, from_card_num));
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    assert(from_card_num < to_card_num,
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           err_msg("Wrong order? from: " SIZE_FORMAT ", to: "SIZE_FORMAT,
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                   from_card_num, to_card_num));
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    assert(to_card_num <= _committed_max_card_num,
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           err_msg("to card num out of range: "
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                   "to: "SIZE_FORMAT ", "
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                   "max: "SIZE_FORMAT,
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                   to_card_num, _committed_max_card_num));
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    to_card_num = MIN2(_committed_max_card_num, to_card_num);
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    Copy::fill_to_bytes(&_card_counts[from_card_num], (to_card_num - from_card_num));
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  }
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}
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G1CardCounts::G1CardCounts(G1CollectedHeap *g1h):
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  _g1h(g1h), _card_counts(NULL),
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  _reserved_max_card_num(0), _committed_max_card_num(0),
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  _committed_size(0) {}
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void G1CardCounts::initialize() {
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  assert(_g1h->max_capacity() > 0, "initialization order");
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  assert(_g1h->capacity() == 0, "initialization order");
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  if (G1ConcRSHotCardLimit > 0) {
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    // The max value we can store in the counts table is
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    // max_jubyte. Guarantee the value of the hot
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    // threshold limit is no more than this.
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    guarantee(G1ConcRSHotCardLimit <= max_jubyte, "sanity");
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    _ct_bs = _g1h->g1_barrier_set();
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    _ct_bot = _ct_bs->byte_for_const(_g1h->reserved_region().start());
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    // Allocate/Reserve the counts table
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    size_t reserved_bytes = _g1h->max_capacity();
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    _reserved_max_card_num = reserved_bytes >> CardTableModRefBS::card_shift;
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    size_t reserved_size = _reserved_max_card_num * sizeof(jbyte);
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    ReservedSpace rs(ReservedSpace::allocation_align_size_up(reserved_size));
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    if (!rs.is_reserved()) {
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      warning("Could not reserve enough space for the card counts table");
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      guarantee(!has_reserved_count_table(), "should be NULL");
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      return;
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    }
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    MemTracker::record_virtual_memory_type((address)rs.base(), mtGC);
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    _card_counts_storage.initialize(rs, 0);
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    _card_counts = (jubyte*) _card_counts_storage.low();
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  }
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}
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void G1CardCounts::resize(size_t heap_capacity) {
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  // Expand the card counts table to handle a heap with the given capacity.
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  if (!has_reserved_count_table()) {
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    // Don't expand if we failed to reserve the card counts table.
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    return;
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  }
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  assert(_committed_size ==
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         ReservedSpace::allocation_align_size_up(_committed_size),
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         err_msg("Unaligned? committed_size: " SIZE_FORMAT, _committed_size));
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  // Verify that the committed space for the card counts matches our
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  // committed max card num. Note for some allocation alignments, the
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  // amount of space actually committed for the counts table will be able
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  // to span more cards than the number spanned by the maximum heap.
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  size_t prev_committed_size = _committed_size;
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  size_t prev_committed_card_num = committed_to_card_num(prev_committed_size);
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  assert(prev_committed_card_num == _committed_max_card_num,
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         err_msg("Card mismatch: "
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                 "prev: " SIZE_FORMAT ", "
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                 "committed: "SIZE_FORMAT", "
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                 "reserved: "SIZE_FORMAT,
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                 prev_committed_card_num, _committed_max_card_num, _reserved_max_card_num));
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  size_t new_size = (heap_capacity >> CardTableModRefBS::card_shift) * sizeof(jbyte);
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  size_t new_committed_size = ReservedSpace::allocation_align_size_up(new_size);
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  size_t new_committed_card_num = committed_to_card_num(new_committed_size);
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  if (_committed_max_card_num < new_committed_card_num) {
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    // we need to expand the backing store for the card counts
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    size_t expand_size = new_committed_size - prev_committed_size;
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    if (!_card_counts_storage.expand_by(expand_size)) {
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      warning("Card counts table backing store commit failure");
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      return;
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    }
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    assert(_card_counts_storage.committed_size() == new_committed_size,
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           "expansion commit failure");
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    _committed_size = new_committed_size;
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    _committed_max_card_num = new_committed_card_num;
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    clear_range(prev_committed_card_num, _committed_max_card_num);
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  }
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}
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   137
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uint G1CardCounts::add_card_count(jbyte* card_ptr) {
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  // Returns the number of times the card has been refined.
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  // If we failed to reserve/commit the counts table, return 0.
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  // If card_ptr is beyond the committed end of the counts table,
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  // return 0.
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  // Otherwise return the actual count.
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  // Unless G1ConcRSHotCardLimit has been set appropriately,
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  // returning 0 will result in the card being considered
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  // cold and will be refined immediately.
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  uint count = 0;
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  if (has_count_table()) {
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    size_t card_num = ptr_2_card_num(card_ptr);
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    if (card_num < _committed_max_card_num) {
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      count = (uint) _card_counts[card_num];
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      if (count < G1ConcRSHotCardLimit) {
18496
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        _card_counts[card_num] =
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          (jubyte)(MIN2((uintx)(_card_counts[card_num] + 1), G1ConcRSHotCardLimit));
17327
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      }
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    }
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  }
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  return count;
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}
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bool G1CardCounts::is_hot(uint count) {
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  return (count >= G1ConcRSHotCardLimit);
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}
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void G1CardCounts::clear_region(HeapRegion* hr) {
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  assert(!hr->isHumongous(), "Should have been cleared");
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  if (has_count_table()) {
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    HeapWord* bottom = hr->bottom();
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   169
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    // We use the last address in hr as hr could be the
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    // last region in the heap. In which case trying to find
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    // the card for hr->end() will be an OOB accesss to the
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    // card table.
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    HeapWord* last = hr->end() - 1;
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    assert(_g1h->g1_committed().contains(last),
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           err_msg("last not in committed: "
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                   "last: " PTR_FORMAT ", "
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                   "committed: [" PTR_FORMAT ", " PTR_FORMAT ")",
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                   last,
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                   _g1h->g1_committed().start(),
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                   _g1h->g1_committed().end()));
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   182
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    const jbyte* from_card_ptr = _ct_bs->byte_for_const(bottom);
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    const jbyte* last_card_ptr = _ct_bs->byte_for_const(last);
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   185
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#ifdef ASSERT
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    HeapWord* start_addr = _ct_bs->addr_for(from_card_ptr);
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   188
    assert(start_addr == hr->bottom(), "alignment");
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    HeapWord* last_addr = _ct_bs->addr_for(last_card_ptr);
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    assert((last_addr + CardTableModRefBS::card_size_in_words) == hr->end(), "alignment");
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#endif // ASSERT
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    // Clear the counts for the (exclusive) card range.
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    size_t from_card_num = ptr_2_card_num(from_card_ptr);
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   195
    size_t to_card_num = ptr_2_card_num(last_card_ptr) + 1;
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    clear_range(from_card_num, to_card_num);
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   197
  }
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}
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   199
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void G1CardCounts::clear_all() {
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  assert(SafepointSynchronize::is_at_safepoint(), "don't call this otherwise");
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  clear_range((size_t)0, _committed_max_card_num);
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   203
}
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   204
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G1CardCounts::~G1CardCounts() {
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   206
  if (has_reserved_count_table()) {
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   207
    _card_counts_storage.release();
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   208
  }
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}
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   210