hotspot/src/share/vm/gc_implementation/shared/plab.cpp
author sangheki
Tue, 28 Apr 2015 12:02:50 -0700
changeset 30571 9223db5721fe
parent 30564 a37d98a1eb54
child 30586 23e6e981e89c
permissions -rw-r--r--
8073204: Determining the desired PLAB size adjusts to the the number of threads at the wrong place Summary: Calculate the desired PLAB value for a single thread and then return desired PLAB size according to the current number of threads when needed Reviewed-by: ysr, jwilhelm, tschatzl
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/*
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 * Copyright (c) 2001, 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 "gc_implementation/shared/plab.hpp"
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#include "gc_interface/collectedHeap.hpp"
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#include "memory/threadLocalAllocBuffer.hpp"
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#include "oops/arrayOop.hpp"
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#include "oops/oop.inline.hpp"
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size_t PLAB::min_size() {
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  // Make sure that we return something that is larger than AlignmentReserve
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  return align_object_size(MAX2(MinTLABSize / HeapWordSize, (uintx)oopDesc::header_size())) + AlignmentReserve;
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}
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size_t PLAB::max_size() {
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  return ThreadLocalAllocBuffer::max_size();
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}
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PLAB::PLAB(size_t desired_plab_sz_) :
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  _word_sz(desired_plab_sz_), _bottom(NULL), _top(NULL),
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  _end(NULL), _hard_end(NULL), _allocated(0), _wasted(0), _undo_wasted(0)
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{
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  // ArrayOopDesc::header_size depends on command line initialization.
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  AlignmentReserve = oopDesc::header_size() > MinObjAlignment ? align_object_size(arrayOopDesc::header_size(T_INT)) : 0;
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  assert(min_size() > AlignmentReserve,
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         err_msg("Minimum PLAB size " SIZE_FORMAT" must be larger than alignment reserve " SIZE_FORMAT" "
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                 "to be able to contain objects", min_size(), AlignmentReserve));
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}
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// If the minimum object size is greater than MinObjAlignment, we can
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// end up with a shard at the end of the buffer that's smaller than
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// the smallest object.  We can't allow that because the buffer must
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// look like it's full of objects when we retire it, so we make
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// sure we have enough space for a filler int array object.
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size_t PLAB::AlignmentReserve;
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void PLAB::flush_and_retire_stats(PLABStats* stats) {
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  // Retire the last allocation buffer.
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  size_t unused = retire_internal();
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  // Now flush the statistics.
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  stats->add_allocated(_allocated);
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  stats->add_wasted(_wasted);
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  stats->add_undo_wasted(_undo_wasted);
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  stats->add_unused(unused);
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  // Since we have flushed the stats we need to clear  the _allocated and _wasted
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  // fields in case somebody retains an instance of this over GCs. Not doing so
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  // will artifically inflate the values in the statistics.
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  _allocated   = 0;
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  _wasted      = 0;
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  _undo_wasted = 0;
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}
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void PLAB::retire() {
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  _wasted += retire_internal();
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}
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size_t PLAB::retire_internal() {
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  size_t result = 0;
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  if (_top < _hard_end) {
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    CollectedHeap::fill_with_object(_top, _hard_end);
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    result += invalidate();
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  }
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  return result;
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}
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void PLAB::add_undo_waste(HeapWord* obj, size_t word_sz) {
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  CollectedHeap::fill_with_object(obj, word_sz);
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  _undo_wasted += word_sz;
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}
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void PLAB::undo_last_allocation(HeapWord* obj, size_t word_sz) {
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  assert(pointer_delta(_top, _bottom) >= word_sz, "Bad undo");
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  assert(pointer_delta(_top, obj) == word_sz, "Bad undo");
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  _top = obj;
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}
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void PLAB::undo_allocation(HeapWord* obj, size_t word_sz) {
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  // Is the alloc in the current alloc buffer?
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  if (contains(obj)) {
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    assert(contains(obj + word_sz - 1),
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      "should contain whole object");
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    undo_last_allocation(obj, word_sz);
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  } else {
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    add_undo_waste(obj, word_sz);
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  }
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}
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// Calculates plab size for current number of gc worker threads.
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size_t PLABStats::desired_plab_sz(uint no_of_gc_workers) {
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  assert(no_of_gc_workers > 0, "Number of GC workers should be larger than zero");
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  return align_object_size(_desired_net_plab_sz / MAX2(no_of_gc_workers, 1U));
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}
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// Compute desired plab size for one gc worker thread and latch result for later
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// use. This should be called once at the end of parallel
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// scavenge; it clears the sensor accumulators.
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void PLABStats::adjust_desired_plab_sz() {
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  assert(ResizePLAB, "Not set");
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  assert(is_object_aligned(max_size()) && min_size() <= max_size(),
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         "PLAB clipping computation may be incorrect");
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  if (_allocated == 0) {
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    assert(_unused == 0,
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           err_msg("Inconsistency in PLAB stats: "
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                   "_allocated: "SIZE_FORMAT", "
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                   "_wasted: "SIZE_FORMAT", "
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                   "_unused: "SIZE_FORMAT", "
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                   "_undo_wasted: "SIZE_FORMAT,
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                   _allocated, _wasted, _unused, _undo_wasted));
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    _allocated = 1;
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  }
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  double wasted_frac    = (double)_unused / (double)_allocated;
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  size_t target_refills = (size_t)((wasted_frac * TargetSurvivorRatio) / TargetPLABWastePct);
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  if (target_refills == 0) {
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    target_refills = 1;
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  }
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  size_t used = _allocated - _wasted - _unused;
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  // Assumed to have 1 gc worker thread
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  size_t recent_plab_sz = used / target_refills;
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  // Take historical weighted average
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  _filter.sample(recent_plab_sz);
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  // Clip from above and below, and align to object boundary
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  size_t new_plab_sz = MAX2(min_size(), (size_t)_filter.average());
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  new_plab_sz = MIN2(max_size(), new_plab_sz);
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  new_plab_sz = align_object_size(new_plab_sz);
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  // Latch the result
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  if (PrintPLAB) {
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    gclog_or_tty->print(" (plab_sz = " SIZE_FORMAT" desired_plab_sz = " SIZE_FORMAT") ", recent_plab_sz, new_plab_sz);
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  }
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  _desired_net_plab_sz = new_plab_sz;
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  reset();
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}
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#ifndef PRODUCT
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void PLAB::print() {
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  gclog_or_tty->print_cr("PLAB: _bottom: " PTR_FORMAT "  _top: " PTR_FORMAT
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    "  _end: " PTR_FORMAT "  _hard_end: " PTR_FORMAT ")",
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    p2i(_bottom), p2i(_top), p2i(_end), p2i(_hard_end));
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}
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#endif // !PRODUCT