diff -r f0312c7d5b37 -r ba6c248cae19 src/hotspot/share/gc/cms/jvmFlagConstraintsCMS.cpp --- a/src/hotspot/share/gc/cms/jvmFlagConstraintsCMS.cpp Wed Nov 13 11:21:15 2019 +0100 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,238 +0,0 @@ -/* - * Copyright (c) 2015, 2018, 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. - * - */ - -#include "precompiled.hpp" -#include "gc/cms/jvmFlagConstraintsCMS.hpp" -#include "gc/cms/concurrentMarkSweepGeneration.inline.hpp" -#include "gc/shared/cardTableRS.hpp" -#include "gc/shared/collectedHeap.hpp" -#include "gc/shared/genCollectedHeap.hpp" -#include "gc/shared/jvmFlagConstraintsGC.hpp" -#include "memory/universe.hpp" -#include "runtime/globals_extension.hpp" -#include "utilities/globalDefinitions.hpp" - -static JVMFlag::Error ParallelGCThreadsAndCMSWorkQueueDrainThreshold(uint threads, uintx threshold, bool verbose) { - // CMSWorkQueueDrainThreshold is verified to be less than max_juint - if (UseConcMarkSweepGC && (threads > (uint)(max_jint / (uint)threshold))) { - JVMFlag::printError(verbose, - "ParallelGCThreads (" UINT32_FORMAT ") or CMSWorkQueueDrainThreshold (" - UINTX_FORMAT ") is too large\n", - threads, threshold); - return JVMFlag::VIOLATES_CONSTRAINT; - } - return JVMFlag::SUCCESS; -} - -JVMFlag::Error ParallelGCThreadsConstraintFuncCMS(uint value, bool verbose) { - // To avoid overflow at ParScanClosure::do_oop_work. - if (UseConcMarkSweepGC && (value > (max_jint / 10))) { - JVMFlag::printError(verbose, - "ParallelGCThreads (" UINT32_FORMAT ") must be " - "less than or equal to " UINT32_FORMAT " for CMS GC\n", - value, (max_jint / 10)); - return JVMFlag::VIOLATES_CONSTRAINT; - } - return ParallelGCThreadsAndCMSWorkQueueDrainThreshold(value, CMSWorkQueueDrainThreshold, verbose); -} -JVMFlag::Error ParGCStridesPerThreadConstraintFunc(uintx value, bool verbose) { - if (UseConcMarkSweepGC && (value > ((uintx)max_jint / (uintx)ParallelGCThreads))) { - JVMFlag::printError(verbose, - "ParGCStridesPerThread (" UINTX_FORMAT ") must be " - "less than or equal to ergonomic maximum (" UINTX_FORMAT ")\n", - value, ((uintx)max_jint / (uintx)ParallelGCThreads)); - return JVMFlag::VIOLATES_CONSTRAINT; - } - return JVMFlag::SUCCESS; -} - -JVMFlag::Error ParGCCardsPerStrideChunkConstraintFunc(intx value, bool verbose) { - if (UseConcMarkSweepGC) { - // ParGCCardsPerStrideChunk should be compared with card table size. - size_t heap_size = CMSHeap::heap()->reserved_region().word_size(); - CardTableRS* ct = GenCollectedHeap::heap()->rem_set(); - size_t card_table_size = ct->cards_required(heap_size) - 1; // Valid card table size - - if ((size_t)value > card_table_size) { - JVMFlag::printError(verbose, - "ParGCCardsPerStrideChunk (" INTX_FORMAT ") is too large for the heap size and " - "must be less than or equal to card table size (" SIZE_FORMAT ")\n", - value, card_table_size); - return JVMFlag::VIOLATES_CONSTRAINT; - } - - // ParGCCardsPerStrideChunk is used with n_strides(ParallelGCThreads*ParGCStridesPerThread) - // from CardTableRS::process_stride(). Note that ParGCStridesPerThread is already checked - // not to make an overflow with ParallelGCThreads from its constraint function. - uintx n_strides = ParallelGCThreads * ParGCStridesPerThread; - uintx ergo_max = max_uintx / n_strides; - if ((uintx)value > ergo_max) { - JVMFlag::printError(verbose, - "ParGCCardsPerStrideChunk (" INTX_FORMAT ") must be " - "less than or equal to ergonomic maximum (" UINTX_FORMAT ")\n", - value, ergo_max); - return JVMFlag::VIOLATES_CONSTRAINT; - } - } - return JVMFlag::SUCCESS; -} - -JVMFlag::Error CMSOldPLABMinConstraintFunc(size_t value, bool verbose) { - JVMFlag::Error status = JVMFlag::SUCCESS; - - if (UseConcMarkSweepGC) { - if (value > CMSOldPLABMax) { - JVMFlag::printError(verbose, - "CMSOldPLABMin (" SIZE_FORMAT ") must be " - "less than or equal to CMSOldPLABMax (" SIZE_FORMAT ")\n", - value, CMSOldPLABMax); - return JVMFlag::VIOLATES_CONSTRAINT; - } - status = MaxPLABSizeBounds("CMSOldPLABMin", value, verbose); - } - return status; -} - -JVMFlag::Error CMSOldPLABMaxConstraintFunc(size_t value, bool verbose) { - JVMFlag::Error status = JVMFlag::SUCCESS; - - if (UseConcMarkSweepGC) { - status = MaxPLABSizeBounds("CMSOldPLABMax", value, verbose); - } - return status; -} - -static JVMFlag::Error CMSReservedAreaConstraintFunc(const char* name, size_t value, bool verbose) { - if (UseConcMarkSweepGC) { - ConcurrentMarkSweepGeneration* cms = CMSHeap::heap()->old_gen(); - const size_t ergo_max = cms->cmsSpace()->max_flag_size_for_task_size(); - if (value > ergo_max) { - JVMFlag::printError(verbose, - "%s (" SIZE_FORMAT ") must be " - "less than or equal to ergonomic maximum (" SIZE_FORMAT ") " - "which is based on the maximum size of the old generation of the Java heap\n", - name, value, ergo_max); - return JVMFlag::VIOLATES_CONSTRAINT; - } - } - return JVMFlag::SUCCESS; -} - -JVMFlag::Error CMSRescanMultipleConstraintFunc(size_t value, bool verbose) { - JVMFlag::Error status = CMSReservedAreaConstraintFunc("CMSRescanMultiple", value, verbose); - - if (status == JVMFlag::SUCCESS && UseConcMarkSweepGC) { - // CMSParRemarkTask::do_dirty_card_rescan_tasks requires CompactibleFreeListSpace::rescan_task_size() - // to be aligned to CardTable::card_size * BitsPerWord. - // Note that rescan_task_size() will be aligned if CMSRescanMultiple is a multiple of 'HeapWordSize' - // because rescan_task_size() is CardTable::card_size / HeapWordSize * BitsPerWord. - if (value % HeapWordSize != 0) { - JVMFlag::printError(verbose, - "CMSRescanMultiple (" SIZE_FORMAT ") must be " - "a multiple of %d\n", - value, HeapWordSize); - status = JVMFlag::VIOLATES_CONSTRAINT; - } - } - return status; -} - -JVMFlag::Error CMSConcMarkMultipleConstraintFunc(size_t value, bool verbose) { - return CMSReservedAreaConstraintFunc("CMSConcMarkMultiple", value, verbose); -} - -JVMFlag::Error CMSPrecleanDenominatorConstraintFunc(uintx value, bool verbose) { - if (UseConcMarkSweepGC && (value <= CMSPrecleanNumerator)) { - JVMFlag::printError(verbose, - "CMSPrecleanDenominator (" UINTX_FORMAT ") must be " - "strickly greater than CMSPrecleanNumerator (" UINTX_FORMAT ")\n", - value, CMSPrecleanNumerator); - return JVMFlag::VIOLATES_CONSTRAINT; - } - return JVMFlag::SUCCESS; -} - -JVMFlag::Error CMSPrecleanNumeratorConstraintFunc(uintx value, bool verbose) { - if (UseConcMarkSweepGC && (value >= CMSPrecleanDenominator)) { - JVMFlag::printError(verbose, - "CMSPrecleanNumerator (" UINTX_FORMAT ") must be " - "less than CMSPrecleanDenominator (" UINTX_FORMAT ")\n", - value, CMSPrecleanDenominator); - return JVMFlag::VIOLATES_CONSTRAINT; - } - return JVMFlag::SUCCESS; -} - -JVMFlag::Error CMSSamplingGrainConstraintFunc(uintx value, bool verbose) { - if (UseConcMarkSweepGC) { - size_t max_capacity = CMSHeap::heap()->young_gen()->max_capacity(); - if (value > max_uintx - max_capacity) { - JVMFlag::printError(verbose, - "CMSSamplingGrain (" UINTX_FORMAT ") must be " - "less than or equal to ergonomic maximum (" SIZE_FORMAT ")\n", - value, max_uintx - max_capacity); - return JVMFlag::VIOLATES_CONSTRAINT; - } - } - return JVMFlag::SUCCESS; -} - -JVMFlag::Error CMSWorkQueueDrainThresholdConstraintFunc(uintx value, bool verbose) { - if (UseConcMarkSweepGC) { - return ParallelGCThreadsAndCMSWorkQueueDrainThreshold(ParallelGCThreads, value, verbose); - } - return JVMFlag::SUCCESS; -} - -JVMFlag::Error CMSBitMapYieldQuantumConstraintFunc(size_t value, bool verbose) { - // Skip for current default value. - if (UseConcMarkSweepGC && FLAG_IS_CMDLINE(CMSBitMapYieldQuantum)) { - // CMSBitMapYieldQuantum should be compared with mark bitmap size. - ConcurrentMarkSweepGeneration* cms = CMSHeap::heap()->old_gen(); - size_t bitmap_size = cms->collector()->markBitMap()->sizeInWords(); - - if (value > bitmap_size) { - JVMFlag::printError(verbose, - "CMSBitMapYieldQuantum (" SIZE_FORMAT ") must " - "be less than or equal to bitmap size (" SIZE_FORMAT ") " - "whose size corresponds to the size of old generation of the Java heap\n", - value, bitmap_size); - return JVMFlag::VIOLATES_CONSTRAINT; - } - } - return JVMFlag::SUCCESS; -} - -JVMFlag::Error OldPLABSizeConstraintFuncCMS(size_t value, bool verbose) { - if (value == 0) { - JVMFlag::printError(verbose, - "OldPLABSize (" SIZE_FORMAT ") must be greater than 0", - value); - return JVMFlag::VIOLATES_CONSTRAINT; - } - // For CMS, OldPLABSize is the number of free blocks of a given size that are used when - // replenishing the local per-worker free list caches. - // For more details, please refer to Arguments::set_cms_and_parnew_gc_flags(). - return MaxPLABSizeBounds("OldPLABSize", value, verbose); -}