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1 /* |
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2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 #include "precompiled.hpp" |
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26 #include "gc/g1/g1EvacStats.hpp" |
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27 #include "gc/shared/gcId.hpp" |
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28 #include "trace/tracing.hpp" |
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29 |
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30 void G1EvacStats::adjust_desired_plab_sz() { |
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31 if (PrintPLAB) { |
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32 gclog_or_tty->print(" (allocated = " SIZE_FORMAT " wasted = " SIZE_FORMAT " " |
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33 "unused = " SIZE_FORMAT " used = " SIZE_FORMAT " " |
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34 "undo_waste = " SIZE_FORMAT " region_end_waste = " SIZE_FORMAT " " |
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35 "regions filled = %u direct_allocated = " SIZE_FORMAT " " |
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36 "failure_used = " SIZE_FORMAT " failure_waste = " SIZE_FORMAT ") ", |
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37 _allocated, _wasted, _unused, used(), _undo_wasted, _region_end_waste, |
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38 _regions_filled, _direct_allocated, _failure_used, _failure_waste); |
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39 } |
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40 |
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41 if (ResizePLAB) { |
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42 |
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43 assert(is_object_aligned(max_size()) && min_size() <= max_size(), |
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44 "PLAB clipping computation may be incorrect"); |
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45 |
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46 if (_allocated == 0) { |
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47 assert((_unused == 0), |
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48 err_msg("Inconsistency in PLAB stats: " |
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49 "_allocated: "SIZE_FORMAT", " |
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50 "_wasted: "SIZE_FORMAT", " |
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51 "_region_end_waste: "SIZE_FORMAT", " |
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52 "_unused: "SIZE_FORMAT", " |
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53 "_used : "SIZE_FORMAT, |
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54 _allocated, _wasted, _region_end_waste, _unused, used())); |
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55 _allocated = 1; |
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56 } |
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57 // We account region end waste fully to PLAB allocation. This is not completely fair, |
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58 // but is a conservative assumption because PLABs may be sized flexibly while we |
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59 // cannot adjust direct allocations. |
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60 // In some cases, wasted_frac may become > 1 but that just reflects the problem |
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61 // with region_end_waste. |
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62 double wasted_frac = (double)(_unused + _wasted + _region_end_waste) / (double)_allocated; |
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63 size_t target_refills = (size_t)((wasted_frac * TargetSurvivorRatio) / TargetPLABWastePct); |
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64 if (target_refills == 0) { |
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65 target_refills = 1; |
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66 } |
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67 size_t cur_plab_sz = used() / target_refills; |
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68 // Take historical weighted average |
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69 _filter.sample(cur_plab_sz); |
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70 // Clip from above and below, and align to object boundary |
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71 size_t plab_sz; |
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72 plab_sz = MAX2(min_size(), (size_t)_filter.average()); |
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73 plab_sz = MIN2(max_size(), plab_sz); |
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74 plab_sz = align_object_size(plab_sz); |
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75 // Latch the result |
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76 _desired_net_plab_sz = plab_sz; |
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77 if (PrintPLAB) { |
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78 gclog_or_tty->print_cr(" (plab_sz = " SIZE_FORMAT " desired_plab_sz = " SIZE_FORMAT ") ", cur_plab_sz, plab_sz); |
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79 } |
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80 } |
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81 // Clear accumulators for next round. |
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82 reset(); |
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83 } |
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84 |