| /* |
| * Copyright (c) 2018, Red Hat, Inc. All rights reserved. |
| * |
| * 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_SHENANDOAH_SHENANDOAHNUMBERSEQ_HPP |
| #define SHARE_GC_SHENANDOAH_SHENANDOAHNUMBERSEQ_HPP |
| |
| #include "utilities/numberSeq.hpp" |
| |
| // HDR sequence stores the low-resolution high-dynamic-range values. |
| // It does so by maintaining the double array, where first array defines |
| // the magnitude of the value being stored, and the second array maintains |
| // the low resolution histogram within that magnitude. For example, storing |
| // 4.352819 * 10^3 increments the bucket _hdr[3][435]. This allows for |
| // memory efficient storage of huge amount of samples. |
| // |
| // Accepts positive numbers only. |
| class HdrSeq: public NumberSeq { |
| private: |
| enum PrivateConstants { |
| ValBuckets = 512, |
| MagBuckets = 24, |
| MagMinimum = -12 |
| }; |
| int** _hdr; |
| |
| public: |
| HdrSeq(); |
| ~HdrSeq(); |
| |
| virtual void add(double val); |
| double percentile(double level) const; |
| }; |
| |
| // Binary magnitude sequence stores the power-of-two histogram. |
| // It has very low memory requirements, and is thread-safe. When accuracy |
| // is not needed, it is preferred over HdrSeq. |
| class BinaryMagnitudeSeq { |
| private: |
| size_t _sum; |
| size_t* _mags; |
| |
| public: |
| BinaryMagnitudeSeq(); |
| ~BinaryMagnitudeSeq(); |
| |
| void add(size_t val); |
| size_t num() const; |
| size_t level(int level) const; |
| size_t sum() const; |
| int min_level() const; |
| int max_level() const; |
| }; |
| |
| #endif // SHARE_GC_SHENANDOAH_SHENANDOAHNUMBERSEQ_HPP |