--- a/src/hotspot/share/gc/cms/jvmFlagConstraintsCMS.cpp Fri Nov 08 14:54:17 2019 +0000
+++ /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);
-}