hotspot/src/share/vm/memory/heap.cpp
author coleenp
Wed, 15 Feb 2017 22:59:57 -0500
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child 43945 e7f2e49d2274
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8169881: Remove implicit Handle conversions oop->Handle Summary: Pass THREAD to Handle as argument instead of implicit Thread::current() call. Reviewed-by: dholmes, sspitsyn
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/*
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 * Copyright (c) 1997, 2015, 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 "memory/heap.hpp"
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#include "oops/oop.inline.hpp"
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#include "runtime/os.hpp"
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#include "services/memTracker.hpp"
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size_t CodeHeap::header_size() {
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  return sizeof(HeapBlock);
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}
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// Implementation of Heap
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CodeHeap::CodeHeap(const char* name, const int code_blob_type)
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  : _code_blob_type(code_blob_type) {
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  _name                         = name;
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  _number_of_committed_segments = 0;
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  _number_of_reserved_segments  = 0;
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  _segment_size                 = 0;
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  _log2_segment_size            = 0;
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  _next_segment                 = 0;
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  _freelist                     = NULL;
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  _freelist_segments            = 0;
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  _freelist_length              = 0;
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  _max_allocated_capacity       = 0;
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  _blob_count                   = 0;
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  _nmethod_count                = 0;
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  _adapter_count                = 0;
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  _full_count                   = 0;
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}
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void CodeHeap::mark_segmap_as_free(size_t beg, size_t end) {
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  assert(              beg <  _number_of_committed_segments, "interval begin out of bounds");
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  assert(beg <  end && end <= _number_of_committed_segments, "interval end   out of bounds");
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  // setup _segmap pointers for faster indexing
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  address p = (address)_segmap.low() + beg;
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  address q = (address)_segmap.low() + end;
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  // initialize interval
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  while (p < q) *p++ = free_sentinel;
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}
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void CodeHeap::mark_segmap_as_used(size_t beg, size_t end) {
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  assert(              beg <  _number_of_committed_segments, "interval begin out of bounds");
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  assert(beg <  end && end <= _number_of_committed_segments, "interval end   out of bounds");
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  // setup _segmap pointers for faster indexing
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  address p = (address)_segmap.low() + beg;
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  address q = (address)_segmap.low() + end;
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  // initialize interval
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  int i = 0;
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  while (p < q) {
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    *p++ = i++;
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    if (i == free_sentinel) i = 1;
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  }
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}
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static size_t align_to_page_size(size_t size) {
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  const size_t alignment = (size_t)os::vm_page_size();
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  assert(is_power_of_2(alignment), "no kidding ???");
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  return (size + alignment - 1) & ~(alignment - 1);
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}
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void CodeHeap::on_code_mapping(char* base, size_t size) {
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#ifdef LINUX
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  extern void linux_wrap_code(char* base, size_t size);
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  linux_wrap_code(base, size);
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#endif
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}
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bool CodeHeap::reserve(ReservedSpace rs, size_t committed_size, size_t segment_size) {
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  assert(rs.size() >= committed_size, "reserved < committed");
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  assert(segment_size >= sizeof(FreeBlock), "segment size is too small");
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  assert(is_power_of_2(segment_size), "segment_size must be a power of 2");
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  _segment_size      = segment_size;
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  _log2_segment_size = exact_log2(segment_size);
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  // Reserve and initialize space for _memory.
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  size_t page_size = os::vm_page_size();
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  if (os::can_execute_large_page_memory()) {
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    const size_t min_pages = 8;
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    page_size = MIN2(os::page_size_for_region_aligned(committed_size, min_pages),
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                     os::page_size_for_region_aligned(rs.size(), min_pages));
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  }
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  const size_t granularity = os::vm_allocation_granularity();
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  const size_t c_size = align_size_up(committed_size, page_size);
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  os::trace_page_sizes(_name, committed_size, rs.size(), page_size,
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                       rs.base(), rs.size());
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  if (!_memory.initialize(rs, c_size)) {
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    return false;
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  }
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  on_code_mapping(_memory.low(), _memory.committed_size());
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  _number_of_committed_segments = size_to_segments(_memory.committed_size());
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  _number_of_reserved_segments  = size_to_segments(_memory.reserved_size());
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  assert(_number_of_reserved_segments >= _number_of_committed_segments, "just checking");
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  const size_t reserved_segments_alignment = MAX2((size_t)os::vm_page_size(), granularity);
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  const size_t reserved_segments_size = align_size_up(_number_of_reserved_segments, reserved_segments_alignment);
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  const size_t committed_segments_size = align_to_page_size(_number_of_committed_segments);
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  // reserve space for _segmap
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  if (!_segmap.initialize(reserved_segments_size, committed_segments_size)) {
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    return false;
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  }
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  MemTracker::record_virtual_memory_type((address)_segmap.low_boundary(), mtCode);
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  assert(_segmap.committed_size() >= (size_t) _number_of_committed_segments, "could not commit  enough space for segment map");
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  assert(_segmap.reserved_size()  >= (size_t) _number_of_reserved_segments , "could not reserve enough space for segment map");
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  assert(_segmap.reserved_size()  >= _segmap.committed_size()     , "just checking");
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  // initialize remaining instance variables
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  clear();
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  return true;
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}
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bool CodeHeap::expand_by(size_t size) {
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  // expand _memory space
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  size_t dm = align_to_page_size(_memory.committed_size() + size) - _memory.committed_size();
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  if (dm > 0) {
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    // Use at least the available uncommitted space if 'size' is larger
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    if (_memory.uncommitted_size() != 0 && dm > _memory.uncommitted_size()) {
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      dm = _memory.uncommitted_size();
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    }
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    char* base = _memory.low() + _memory.committed_size();
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    if (!_memory.expand_by(dm)) return false;
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    on_code_mapping(base, dm);
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    size_t i = _number_of_committed_segments;
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    _number_of_committed_segments = size_to_segments(_memory.committed_size());
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    assert(_number_of_reserved_segments == size_to_segments(_memory.reserved_size()), "number of reserved segments should not change");
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    assert(_number_of_reserved_segments >= _number_of_committed_segments, "just checking");
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    // expand _segmap space
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    size_t ds = align_to_page_size(_number_of_committed_segments) - _segmap.committed_size();
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    if ((ds > 0) && !_segmap.expand_by(ds)) {
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      return false;
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    }
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    assert(_segmap.committed_size() >= (size_t) _number_of_committed_segments, "just checking");
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    // initialize additional segmap entries
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    mark_segmap_as_free(i, _number_of_committed_segments);
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  }
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  return true;
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}
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void CodeHeap::clear() {
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  _next_segment = 0;
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  mark_segmap_as_free(0, _number_of_committed_segments);
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}
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void* CodeHeap::allocate(size_t instance_size) {
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  size_t number_of_segments = size_to_segments(instance_size + header_size());
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  assert(segments_to_size(number_of_segments) >= sizeof(FreeBlock), "not enough room for FreeList");
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  // First check if we can satisfy request from freelist
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  NOT_PRODUCT(verify());
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  HeapBlock* block = search_freelist(number_of_segments);
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  NOT_PRODUCT(verify());
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  if (block != NULL) {
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    assert(block->length() >= number_of_segments && block->length() < number_of_segments + CodeCacheMinBlockLength, "sanity check");
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    assert(!block->free(), "must be marked free");
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    DEBUG_ONLY(memset((void*)block->allocated_space(), badCodeHeapNewVal, instance_size));
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    _max_allocated_capacity = MAX2(_max_allocated_capacity, allocated_capacity());
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    _blob_count++;
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    return block->allocated_space();
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  }
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  // Ensure minimum size for allocation to the heap.
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  number_of_segments = MAX2((int)CodeCacheMinBlockLength, (int)number_of_segments);
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  if (_next_segment + number_of_segments <= _number_of_committed_segments) {
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    mark_segmap_as_used(_next_segment, _next_segment + number_of_segments);
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    HeapBlock* b =  block_at(_next_segment);
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    b->initialize(number_of_segments);
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    _next_segment += number_of_segments;
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    DEBUG_ONLY(memset((void *)b->allocated_space(), badCodeHeapNewVal, instance_size));
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    _max_allocated_capacity = MAX2(_max_allocated_capacity, allocated_capacity());
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    _blob_count++;
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    return b->allocated_space();
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  } else {
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    return NULL;
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  }
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}
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void CodeHeap::deallocate(void* p) {
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  assert(p == find_start(p), "illegal deallocation");
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  // Find start of HeapBlock
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  HeapBlock* b = (((HeapBlock *)p) - 1);
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  assert(b->allocated_space() == p, "sanity check");
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  DEBUG_ONLY(memset((void *)b->allocated_space(), badCodeHeapFreeVal,
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             segments_to_size(b->length()) - sizeof(HeapBlock)));
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  add_to_freelist(b);
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  NOT_PRODUCT(verify());
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}
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/**
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 * Uses segment map to find the the start (header) of a nmethod. This works as follows:
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 * The memory of the code cache is divided into 'segments'. The size of a segment is
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 * determined by -XX:CodeCacheSegmentSize=XX. Allocation in the code cache can only
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 * happen at segment boundaries. A pointer in the code cache can be mapped to a segment
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 * by calling segment_for(addr). Each time memory is requested from the code cache,
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 * the segmap is updated accordingly. See the following example, which illustrates the
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 * state of code cache and the segment map: (seg -> segment, nm ->nmethod)
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 *
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 *          code cache          segmap
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 *         -----------        ---------
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 * seg 1   | nm 1    |   ->   | 0     |
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 * seg 2   | nm 1    |   ->   | 1     |
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 * ...     | nm 1    |   ->   | ..    |
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 * seg m   | nm 2    |   ->   | 0     |
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 * seg m+1 | nm 2    |   ->   | 1     |
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 * ...     | nm 2    |   ->   | 2     |
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 * ...     | nm 2    |   ->   | ..    |
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 * ...     | nm 2    |   ->   | 0xFE  |
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 * seg m+n | nm 2    |   ->   | 1     |
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 * ...     | nm 2    |   ->   |       |
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 *
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 * A value of '0' in the segmap indicates that this segment contains the beginning of
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 * an nmethod. Let's walk through a simple example: If we want to find the start of
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 * an nmethod that falls into seg 2, we read the value of the segmap[2]. The value
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 * is an offset that points to the segment that contains the start of the nmethod.
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 * Another example: If we want to get the start of nm 2, and we happen to get a pointer
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 * that points to seg m+n, we first read seg[n+m], which returns '1'. So we have to
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 * do one more read of the segmap[m+n-1] to finally get the segment header.
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 */
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void* CodeHeap::find_start(void* p) const {
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  if (!contains(p)) {
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    return NULL;
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  }
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  size_t seg_idx = segment_for(p);
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  address seg_map = (address)_segmap.low();
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  if (is_segment_unused(seg_map[seg_idx])) {
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    return NULL;
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  }
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  while (seg_map[seg_idx] > 0) {
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    seg_idx -= (int)seg_map[seg_idx];
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  }
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  HeapBlock* h = block_at(seg_idx);
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  if (h->free()) {
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    return NULL;
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  }
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  return h->allocated_space();
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}
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CodeBlob* CodeHeap::find_blob_unsafe(void* start) const {
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  CodeBlob* result = (CodeBlob*)CodeHeap::find_start(start);
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  if (result != NULL && result->blob_contains((address)start)) {
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    return result;
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  }
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  return NULL;
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}
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size_t CodeHeap::alignment_unit() const {
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  // this will be a power of two
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  return _segment_size;
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}
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size_t CodeHeap::alignment_offset() const {
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  // The lowest address in any allocated block will be
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  // equal to alignment_offset (mod alignment_unit).
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  return sizeof(HeapBlock) & (_segment_size - 1);
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}
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// Returns the current block if available and used.
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// If not, it returns the subsequent block (if available), NULL otherwise.
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// Free blocks are merged, therefore there is at most one free block
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// between two used ones. As a result, the subsequent block (if available) is
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// guaranteed to be used.
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void* CodeHeap::next_used(HeapBlock* b) const {
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  if (b != NULL && b->free()) b = next_block(b);
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  assert(b == NULL || !b->free(), "must be in use or at end of heap");
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  return (b == NULL) ? NULL : b->allocated_space();
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}
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// Returns the first used HeapBlock
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HeapBlock* CodeHeap::first_block() const {
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  if (_next_segment > 0)
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    return block_at(0);
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  return NULL;
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}
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   316
HeapBlock* CodeHeap::block_start(void* q) const {
1
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parents:
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   317
  HeapBlock* b = (HeapBlock*)find_start(q);
489c9b5090e2 Initial load
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parents:
diff changeset
   318
  if (b == NULL) return NULL;
489c9b5090e2 Initial load
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parents:
diff changeset
   319
  return b - 1;
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parents:
diff changeset
   320
}
489c9b5090e2 Initial load
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parents:
diff changeset
   321
489c9b5090e2 Initial load
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parents:
diff changeset
   322
// Returns the next Heap block an offset into one
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parents:
diff changeset
   323
HeapBlock* CodeHeap::next_block(HeapBlock *b) const {
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parents:
diff changeset
   324
  if (b == NULL) return NULL;
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parents:
diff changeset
   325
  size_t i = segment_for(b) + b->length();
489c9b5090e2 Initial load
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parents:
diff changeset
   326
  if (i < _next_segment)
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parents:
diff changeset
   327
    return block_at(i);
489c9b5090e2 Initial load
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parents:
diff changeset
   328
  return NULL;
489c9b5090e2 Initial load
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parents:
diff changeset
   329
}
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parents:
diff changeset
   330
489c9b5090e2 Initial load
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parents:
diff changeset
   331
489c9b5090e2 Initial load
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parents:
diff changeset
   332
// Returns current capacity
489c9b5090e2 Initial load
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parents:
diff changeset
   333
size_t CodeHeap::capacity() const {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   334
  return _memory.committed_size();
489c9b5090e2 Initial load
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parents:
diff changeset
   335
}
489c9b5090e2 Initial load
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parents:
diff changeset
   336
489c9b5090e2 Initial load
duke
parents:
diff changeset
   337
size_t CodeHeap::max_capacity() const {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   338
  return _memory.reserved_size();
489c9b5090e2 Initial load
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parents:
diff changeset
   339
}
489c9b5090e2 Initial load
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parents:
diff changeset
   340
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b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   341
int CodeHeap::allocated_segments() const {
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   342
  return (int)_next_segment;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   343
}
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   344
1
489c9b5090e2 Initial load
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parents:
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   345
size_t CodeHeap::allocated_capacity() const {
17016
78b1c3670525 8006952: Slow VM due to excessive code cache freelist iteration
neliasso
parents: 16670
diff changeset
   346
  // size of used heap - size on freelist
78b1c3670525 8006952: Slow VM due to excessive code cache freelist iteration
neliasso
parents: 16670
diff changeset
   347
  return segments_to_size(_next_segment - _freelist_segments);
1
489c9b5090e2 Initial load
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parents:
diff changeset
   348
}
489c9b5090e2 Initial load
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parents:
diff changeset
   349
17016
78b1c3670525 8006952: Slow VM due to excessive code cache freelist iteration
neliasso
parents: 16670
diff changeset
   350
// Returns size of the unallocated heap block
78b1c3670525 8006952: Slow VM due to excessive code cache freelist iteration
neliasso
parents: 16670
diff changeset
   351
size_t CodeHeap::heap_unallocated_capacity() const {
78b1c3670525 8006952: Slow VM due to excessive code cache freelist iteration
neliasso
parents: 16670
diff changeset
   352
  // Total number of segments - number currently used
78b1c3670525 8006952: Slow VM due to excessive code cache freelist iteration
neliasso
parents: 16670
diff changeset
   353
  return segments_to_size(_number_of_reserved_segments - _next_segment);
7715
12998f95a334 7008325: CodeCache exhausted on sparc starting from hs20b04
kvn
parents: 7397
diff changeset
   354
}
12998f95a334 7008325: CodeCache exhausted on sparc starting from hs20b04
kvn
parents: 7397
diff changeset
   355
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   356
// Free list management
489c9b5090e2 Initial load
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parents:
diff changeset
   357
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   358
FreeBlock* CodeHeap::following_block(FreeBlock *b) {
1
489c9b5090e2 Initial load
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parents:
diff changeset
   359
  return (FreeBlock*)(((address)b) + _segment_size * b->length());
489c9b5090e2 Initial load
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parents:
diff changeset
   360
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   361
489c9b5090e2 Initial load
duke
parents:
diff changeset
   362
// Inserts block b after a
489c9b5090e2 Initial load
duke
parents:
diff changeset
   363
void CodeHeap::insert_after(FreeBlock* a, FreeBlock* b) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   364
  assert(a != NULL && b != NULL, "must be real pointers");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   365
489c9b5090e2 Initial load
duke
parents:
diff changeset
   366
  // Link b into the list after a
489c9b5090e2 Initial load
duke
parents:
diff changeset
   367
  b->set_link(a->link());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   368
  a->set_link(b);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   369
489c9b5090e2 Initial load
duke
parents:
diff changeset
   370
  // See if we can merge blocks
489c9b5090e2 Initial load
duke
parents:
diff changeset
   371
  merge_right(b); // Try to make b bigger
489c9b5090e2 Initial load
duke
parents:
diff changeset
   372
  merge_right(a); // Try to make a include b
489c9b5090e2 Initial load
duke
parents:
diff changeset
   373
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   374
489c9b5090e2 Initial load
duke
parents:
diff changeset
   375
// Try to merge this block with the following block
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   376
bool CodeHeap::merge_right(FreeBlock* a) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   377
  assert(a->free(), "must be a free block");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   378
  if (following_block(a) == a->link()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   379
    assert(a->link() != NULL && a->link()->free(), "must be free too");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   380
    // Update block a to include the following block
489c9b5090e2 Initial load
duke
parents:
diff changeset
   381
    a->set_length(a->length() + a->link()->length());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   382
    a->set_link(a->link()->link());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   383
    // Update find_start map
489c9b5090e2 Initial load
duke
parents:
diff changeset
   384
    size_t beg = segment_for(a);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   385
    mark_segmap_as_used(beg, beg + a->length());
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   386
    _freelist_length--;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   387
    return true;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   388
  }
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   389
  return false;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   390
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   391
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   392
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   393
void CodeHeap::add_to_freelist(HeapBlock* a) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   394
  FreeBlock* b = (FreeBlock*)a;
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   395
  _freelist_length++;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   396
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   397
  assert(b != _freelist, "cannot be removed twice");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   398
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   399
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   400
  // Mark as free and update free space count
17016
78b1c3670525 8006952: Slow VM due to excessive code cache freelist iteration
neliasso
parents: 16670
diff changeset
   401
  _freelist_segments += b->length();
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   402
  b->set_free();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   403
489c9b5090e2 Initial load
duke
parents:
diff changeset
   404
  // First element in list?
489c9b5090e2 Initial load
duke
parents:
diff changeset
   405
  if (_freelist == NULL) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   406
    _freelist = b;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   407
    b->set_link(NULL);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   408
    return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   409
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   410
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   411
  // Since the freelist is ordered (smaller addresses -> larger addresses) and the
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   412
  // element we want to insert into the freelist has a smaller address than the first
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   413
  // element, we can simply add 'b' as the first element and we are done.
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   414
  if (b < _freelist) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   415
    // Insert first in list
489c9b5090e2 Initial load
duke
parents:
diff changeset
   416
    b->set_link(_freelist);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   417
    _freelist = b;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   418
    merge_right(_freelist);
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   419
    return;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   420
  }
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   421
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   422
  // Scan for right place to put into list. List
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   423
  // is sorted by increasing addresses
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   424
  FreeBlock* prev = _freelist;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   425
  FreeBlock* cur  = _freelist->link();
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   426
  while(cur != NULL && cur < b) {
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   427
    assert(prev < cur, "Freelist must be ordered");
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   428
    prev = cur;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   429
    cur  = cur->link();
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   430
  }
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   431
  assert((prev < b) && (cur == NULL || b < cur), "free-list must be ordered");
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   432
  insert_after(prev, b);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   433
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   434
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   435
/**
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   436
 * Search freelist for an entry on the list with the best fit.
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   437
 * @return NULL, if no one was found
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   438
 */
27420
04e6f914cce1 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
anoll
parents: 26809
diff changeset
   439
FreeBlock* CodeHeap::search_freelist(size_t length) {
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   440
  FreeBlock* found_block = NULL;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   441
  FreeBlock* found_prev  = NULL;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   442
  size_t     found_length = 0;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   443
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   444
  FreeBlock* prev = NULL;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   445
  FreeBlock* cur = _freelist;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   446
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   447
  // Search for first block that fits
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   448
  while(cur != NULL) {
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   449
    if (cur->length() >= length) {
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   450
      // Remember block, its previous element, and its length
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   451
      found_block = cur;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   452
      found_prev  = prev;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   453
      found_length = found_block->length();
17016
78b1c3670525 8006952: Slow VM due to excessive code cache freelist iteration
neliasso
parents: 16670
diff changeset
   454
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   455
      break;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   456
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   457
    // Next element in list
489c9b5090e2 Initial load
duke
parents:
diff changeset
   458
    prev = cur;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   459
    cur  = cur->link();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   460
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   461
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   462
  if (found_block == NULL) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   463
    // None found
489c9b5090e2 Initial load
duke
parents:
diff changeset
   464
    return NULL;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   465
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   466
489c9b5090e2 Initial load
duke
parents:
diff changeset
   467
  // Exact (or at least good enough) fit. Remove from list.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   468
  // Don't leave anything on the freelist smaller than CodeCacheMinBlockLength.
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   469
  if (found_length - length < CodeCacheMinBlockLength) {
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   470
    _freelist_length--;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   471
    length = found_length;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   472
    if (found_prev == NULL) {
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   473
      assert(_freelist == found_block, "sanity check");
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   474
      _freelist = _freelist->link();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   475
    } else {
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   476
      assert((found_prev->link() == found_block), "sanity check");
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   477
      // Unmap element
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   478
      found_prev->set_link(found_block->link());
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   479
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   480
  } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   481
    // Truncate block and return a pointer to the following block
489c9b5090e2 Initial load
duke
parents:
diff changeset
   482
    // Set used bit and length on new block
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   483
    found_block->set_length(found_length - length);
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   484
    found_block = following_block(found_block);
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   485
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   486
    size_t beg = segment_for(found_block);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   487
    mark_segmap_as_used(beg, beg + length);
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   488
    found_block->set_length(length);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   489
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   490
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   491
  found_block->set_used();
17016
78b1c3670525 8006952: Slow VM due to excessive code cache freelist iteration
neliasso
parents: 16670
diff changeset
   492
  _freelist_segments -= length;
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   493
  return found_block;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   494
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   495
489c9b5090e2 Initial load
duke
parents:
diff changeset
   496
//----------------------------------------------------------------------------
489c9b5090e2 Initial load
duke
parents:
diff changeset
   497
// Non-product code
489c9b5090e2 Initial load
duke
parents:
diff changeset
   498
489c9b5090e2 Initial load
duke
parents:
diff changeset
   499
#ifndef PRODUCT
489c9b5090e2 Initial load
duke
parents:
diff changeset
   500
489c9b5090e2 Initial load
duke
parents:
diff changeset
   501
void CodeHeap::print() {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   502
  tty->print_cr("The Heap");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   503
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   504
489c9b5090e2 Initial load
duke
parents:
diff changeset
   505
void CodeHeap::verify() {
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   506
  if (VerifyCodeCache) {
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   507
    size_t len = 0;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   508
    int count = 0;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   509
    for(FreeBlock* b = _freelist; b != NULL; b = b->link()) {
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   510
      len += b->length();
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   511
      count++;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   512
      // Check if we have merged all free blocks
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   513
      assert(merge_right(b) == false, "Missed merging opportunity");
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   514
    }
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   515
    // Verify that freelist contains the right amount of free space
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   516
    assert(len == _freelist_segments, "wrong freelist");
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   517
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   518
    for(HeapBlock* h = first_block(); h != NULL; h = next_block(h)) {
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   519
      if (h->free()) count--;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   520
    }
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   521
    // Verify that the freelist contains the same number of blocks
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   522
    // than free blocks found on the full list.
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   523
    assert(count == 0, "missing free blocks");
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   524
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   525
    // Verify that the number of free blocks is not out of hand.
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   526
    static int free_block_threshold = 10000;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   527
    if (count > free_block_threshold) {
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   528
      warning("CodeHeap: # of free blocks > %d", free_block_threshold);
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   529
      // Double the warning limit
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   530
      free_block_threshold *= 2;
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   531
    }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   532
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   533
}
23214
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   534
b6426873cb37 8029799: vm/mlvm/anonloader/stress/oome prints warning: CodeHeap: # of free blocks > 10000
anoll
parents: 22551
diff changeset
   535
#endif