85 lines
3.6 KiB
C++
85 lines
3.6 KiB
C++
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/*
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* Copyright (c) 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/g1/g1EvacStats.hpp"
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#include "gc/shared/gcId.hpp"
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#include "trace/tracing.hpp"
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void G1EvacStats::adjust_desired_plab_sz() {
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if (PrintPLAB) {
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gclog_or_tty->print(" (allocated = " SIZE_FORMAT " wasted = " SIZE_FORMAT " "
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"unused = " SIZE_FORMAT " used = " SIZE_FORMAT " "
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"undo_waste = " SIZE_FORMAT " region_end_waste = " SIZE_FORMAT " "
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"regions filled = %u direct_allocated = " SIZE_FORMAT " "
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"failure_used = " SIZE_FORMAT " failure_waste = " SIZE_FORMAT ") ",
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_allocated, _wasted, _unused, used(), _undo_wasted, _region_end_waste,
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_regions_filled, _direct_allocated, _failure_used, _failure_waste);
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}
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if (ResizePLAB) {
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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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"_region_end_waste: "SIZE_FORMAT", "
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"_unused: "SIZE_FORMAT", "
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"_used : "SIZE_FORMAT,
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_allocated, _wasted, _region_end_waste, _unused, used()));
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_allocated = 1;
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}
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// We account region end waste fully to PLAB allocation. This is not completely fair,
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// but is a conservative assumption because PLABs may be sized flexibly while we
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// cannot adjust direct allocations.
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// In some cases, wasted_frac may become > 1 but that just reflects the problem
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// with region_end_waste.
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double wasted_frac = (double)(_unused + _wasted + _region_end_waste) / (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 cur_plab_sz = used() / target_refills;
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// Take historical weighted average
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_filter.sample(cur_plab_sz);
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// Clip from above and below, and align to object boundary
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size_t plab_sz;
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plab_sz = MAX2(min_size(), (size_t)_filter.average());
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plab_sz = MIN2(max_size(), plab_sz);
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plab_sz = align_object_size(plab_sz);
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// Latch the result
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_desired_net_plab_sz = plab_sz;
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if (PrintPLAB) {
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gclog_or_tty->print_cr(" (plab_sz = " SIZE_FORMAT " desired_plab_sz = " SIZE_FORMAT ") ", cur_plab_sz, plab_sz);
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}
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}
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// Clear accumulators for next round.
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reset();
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}
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