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/*
* Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef SHARE_GC_G1_G1EVACSTATS_HPP
#define SHARE_GC_G1_G1EVACSTATS_HPP
#include "gc/shared/plab.hpp"
#include "gc/shared/gcUtil.hpp"
// Records various memory allocation statistics gathered during evacuation. All sizes
// are in HeapWords.
class G1EvacStats : public PLABStats {
size_t _default_plab_size;
size_t _desired_net_plab_size; // Output of filter (below), suitably trimmed and quantized
AdaptiveWeightedAverage
_net_plab_size_filter; // Integrator with decay
size_t _region_end_waste; // Number of words wasted due to skipping to the next region.
uint _regions_filled; // Number of regions filled completely.
size_t _num_plab_filled; // Number of PLABs filled and retired.
size_t _direct_allocated; // Number of words allocated directly into the regions.
size_t _num_direct_allocated; // Number of direct allocation attempts.
// Number of words in live objects remaining in regions that ultimately suffered an
// evacuation failure. This is used in the regions when the regions are made old regions.
size_t _failure_used;
// Number of words wasted in regions which failed evacuation. This is the sum of space
// for objects successfully copied out of the regions (now dead space) plus waste at the
// end of regions.
size_t _failure_waste;
virtual void reset() {
PLABStats::reset();
_region_end_waste = 0;
_regions_filled = 0;
_num_plab_filled = 0;
_direct_allocated = 0;
_num_direct_allocated = 0;
_failure_used = 0;
_failure_waste = 0;
}
void log_plab_allocation();
void log_sizing(size_t calculated_words, size_t net_desired_words);
size_t compute_desired_plab_size() const;
public:
G1EvacStats(const char* description, size_t default_per_thread_plab_size, unsigned wt);
// Calculates plab size for current number of gc worker threads.
size_t desired_plab_size(uint no_of_gc_workers) const;
// Computes the new desired PLAB size assuming one gc worker thread, updating
// _desired_plab_sz, and clearing statistics for the next GC.
// Should be called at the end of a GC pause.
void adjust_desired_plab_size();
uint regions_filled() const { return _regions_filled; }
size_t num_plab_filled() const { return _num_plab_filled; }
size_t region_end_waste() const { return _region_end_waste; }
size_t direct_allocated() const { return _direct_allocated; }
size_t num_direct_allocated() const { return _num_direct_allocated; }
// Amount of space in heapwords used in the failing regions when an evacuation failure happens.
size_t failure_used() const { return _failure_used; }
// Amount of space in heapwords wasted (unused) in the failing regions when an evacuation failure happens.
size_t failure_waste() const { return _failure_waste; }
inline void add_num_plab_filled(size_t value);
inline void add_direct_allocated(size_t value);
inline void add_num_direct_allocated(size_t value);
inline void add_region_end_waste(size_t value);
inline void add_failure_used_and_waste(size_t used, size_t waste);
};
#endif // SHARE_GC_G1_G1EVACSTATS_HPP
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