| /* |
| * 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/shared/collectedHeap.hpp" |
| #include "gc/shared/collectorPolicy.hpp" |
| #include "gc/shared/gcConfig.hpp" |
| #include "gc/shared/jvmFlagConstraintsGC.hpp" |
| #include "gc/shared/plab.hpp" |
| #include "gc/shared/threadLocalAllocBuffer.hpp" |
| #include "runtime/arguments.hpp" |
| #include "runtime/globals.hpp" |
| #include "runtime/globals_extension.hpp" |
| #include "runtime/thread.inline.hpp" |
| #include "utilities/align.hpp" |
| #include "utilities/macros.hpp" |
| #if INCLUDE_CMSGC |
| #include "gc/cms/jvmFlagConstraintsCMS.hpp" |
| #endif |
| #if INCLUDE_G1GC |
| #include "gc/g1/jvmFlagConstraintsG1.hpp" |
| #endif |
| #if INCLUDE_PARALLELGC |
| #include "gc/parallel/jvmFlagConstraintsParallel.hpp" |
| #endif |
| #ifdef COMPILER1 |
| #include "c1/c1_globals.hpp" |
| #endif // COMPILER1 |
| #ifdef COMPILER2 |
| #include "opto/c2_globals.hpp" |
| #endif // COMPILER2 |
| |
| // Some flags that have default values that indicate that the |
| // JVM should automatically determine an appropriate value |
| // for that flag. In those cases it is only appropriate for the |
| // constraint checking to be done if the user has specified the |
| // value(s) of the flag(s) on the command line. In the constraint |
| // checking functions, FLAG_IS_CMDLINE() is used to check if |
| // the flag has been set by the user and so should be checked. |
| |
| // As ParallelGCThreads differs among GC modes, we need constraint function. |
| JVMFlag::Error ParallelGCThreadsConstraintFunc(uint value, bool verbose) { |
| JVMFlag::Error status = JVMFlag::SUCCESS; |
| |
| #if INCLUDE_PARALLELGC |
| status = ParallelGCThreadsConstraintFuncParallel(value, verbose); |
| if (status != JVMFlag::SUCCESS) { |
| return status; |
| } |
| #endif |
| |
| #if INCLUDE_CMSGC |
| status = ParallelGCThreadsConstraintFuncCMS(value, verbose); |
| if (status != JVMFlag::SUCCESS) { |
| return status; |
| } |
| #endif |
| |
| return status; |
| } |
| |
| // As ConcGCThreads should be smaller than ParallelGCThreads, |
| // we need constraint function. |
| JVMFlag::Error ConcGCThreadsConstraintFunc(uint value, bool verbose) { |
| // CMS and G1 GCs use ConcGCThreads. |
| if ((GCConfig::is_gc_selected(CollectedHeap::CMS) || |
| GCConfig::is_gc_selected(CollectedHeap::G1)) && (value > ParallelGCThreads)) { |
| JVMFlag::printError(verbose, |
| "ConcGCThreads (" UINT32_FORMAT ") must be " |
| "less than or equal to ParallelGCThreads (" UINT32_FORMAT ")\n", |
| value, ParallelGCThreads); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } |
| |
| return JVMFlag::SUCCESS; |
| } |
| |
| static JVMFlag::Error MinPLABSizeBounds(const char* name, size_t value, bool verbose) { |
| if ((GCConfig::is_gc_selected(CollectedHeap::CMS) || |
| GCConfig::is_gc_selected(CollectedHeap::G1) || |
| GCConfig::is_gc_selected(CollectedHeap::Parallel)) && (value < PLAB::min_size())) { |
| JVMFlag::printError(verbose, |
| "%s (" SIZE_FORMAT ") must be " |
| "greater than or equal to ergonomic PLAB minimum size (" SIZE_FORMAT ")\n", |
| name, value, PLAB::min_size()); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } |
| |
| return JVMFlag::SUCCESS; |
| } |
| |
| JVMFlag::Error MaxPLABSizeBounds(const char* name, size_t value, bool verbose) { |
| if ((GCConfig::is_gc_selected(CollectedHeap::CMS) || |
| GCConfig::is_gc_selected(CollectedHeap::G1) || |
| GCConfig::is_gc_selected(CollectedHeap::Parallel)) && (value > PLAB::max_size())) { |
| JVMFlag::printError(verbose, |
| "%s (" SIZE_FORMAT ") must be " |
| "less than or equal to ergonomic PLAB maximum size (" SIZE_FORMAT ")\n", |
| name, value, PLAB::max_size()); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } |
| |
| return JVMFlag::SUCCESS; |
| } |
| |
| static JVMFlag::Error MinMaxPLABSizeBounds(const char* name, size_t value, bool verbose) { |
| JVMFlag::Error status = MinPLABSizeBounds(name, value, verbose); |
| |
| if (status == JVMFlag::SUCCESS) { |
| return MaxPLABSizeBounds(name, value, verbose); |
| } |
| return status; |
| } |
| |
| JVMFlag::Error YoungPLABSizeConstraintFunc(size_t value, bool verbose) { |
| return MinMaxPLABSizeBounds("YoungPLABSize", value, verbose); |
| } |
| |
| JVMFlag::Error OldPLABSizeConstraintFunc(size_t value, bool verbose) { |
| JVMFlag::Error status = JVMFlag::SUCCESS; |
| |
| #if INCLUDE_CMSGC |
| if (UseConcMarkSweepGC) { |
| return OldPLABSizeConstraintFuncCMS(value, verbose); |
| } else |
| #endif |
| { |
| status = MinMaxPLABSizeBounds("OldPLABSize", value, verbose); |
| } |
| |
| return status; |
| } |
| |
| JVMFlag::Error MinHeapFreeRatioConstraintFunc(uintx value, bool verbose) { |
| if (value > MaxHeapFreeRatio) { |
| JVMFlag::printError(verbose, |
| "MinHeapFreeRatio (" UINTX_FORMAT ") must be " |
| "less than or equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", |
| value, MaxHeapFreeRatio); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } else { |
| return JVMFlag::SUCCESS; |
| } |
| } |
| |
| JVMFlag::Error MaxHeapFreeRatioConstraintFunc(uintx value, bool verbose) { |
| if (value < MinHeapFreeRatio) { |
| JVMFlag::printError(verbose, |
| "MaxHeapFreeRatio (" UINTX_FORMAT ") must be " |
| "greater than or equal to MinHeapFreeRatio (" UINTX_FORMAT ")\n", |
| value, MinHeapFreeRatio); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } else { |
| return JVMFlag::SUCCESS; |
| } |
| } |
| |
| static JVMFlag::Error CheckMaxHeapSizeAndSoftRefLRUPolicyMSPerMB(size_t maxHeap, intx softRef, bool verbose) { |
| if ((softRef > 0) && ((maxHeap / M) > (max_uintx / softRef))) { |
| JVMFlag::printError(verbose, |
| "Desired lifetime of SoftReferences cannot be expressed correctly. " |
| "MaxHeapSize (" SIZE_FORMAT ") or SoftRefLRUPolicyMSPerMB " |
| "(" INTX_FORMAT ") is too large\n", |
| maxHeap, softRef); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } else { |
| return JVMFlag::SUCCESS; |
| } |
| } |
| |
| JVMFlag::Error SoftRefLRUPolicyMSPerMBConstraintFunc(intx value, bool verbose) { |
| return CheckMaxHeapSizeAndSoftRefLRUPolicyMSPerMB(MaxHeapSize, value, verbose); |
| } |
| |
| JVMFlag::Error MarkStackSizeConstraintFunc(size_t value, bool verbose) { |
| if (value > MarkStackSizeMax) { |
| JVMFlag::printError(verbose, |
| "MarkStackSize (" SIZE_FORMAT ") must be " |
| "less than or equal to MarkStackSizeMax (" SIZE_FORMAT ")\n", |
| value, MarkStackSizeMax); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } else { |
| return JVMFlag::SUCCESS; |
| } |
| } |
| |
| JVMFlag::Error MinMetaspaceFreeRatioConstraintFunc(uintx value, bool verbose) { |
| if (value > MaxMetaspaceFreeRatio) { |
| JVMFlag::printError(verbose, |
| "MinMetaspaceFreeRatio (" UINTX_FORMAT ") must be " |
| "less than or equal to MaxMetaspaceFreeRatio (" UINTX_FORMAT ")\n", |
| value, MaxMetaspaceFreeRatio); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } else { |
| return JVMFlag::SUCCESS; |
| } |
| } |
| |
| JVMFlag::Error MaxMetaspaceFreeRatioConstraintFunc(uintx value, bool verbose) { |
| if (value < MinMetaspaceFreeRatio) { |
| JVMFlag::printError(verbose, |
| "MaxMetaspaceFreeRatio (" UINTX_FORMAT ") must be " |
| "greater than or equal to MinMetaspaceFreeRatio (" UINTX_FORMAT ")\n", |
| value, MinMetaspaceFreeRatio); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } else { |
| return JVMFlag::SUCCESS; |
| } |
| } |
| |
| JVMFlag::Error InitialTenuringThresholdConstraintFunc(uintx value, bool verbose) { |
| #if INCLUDE_PARALLELGC |
| JVMFlag::Error status = InitialTenuringThresholdConstraintFuncParallel(value, verbose); |
| if (status != JVMFlag::SUCCESS) { |
| return status; |
| } |
| #endif |
| |
| return JVMFlag::SUCCESS; |
| } |
| |
| JVMFlag::Error MaxTenuringThresholdConstraintFunc(uintx value, bool verbose) { |
| #if INCLUDE_PARALLELGC |
| JVMFlag::Error status = MaxTenuringThresholdConstraintFuncParallel(value, verbose); |
| if (status != JVMFlag::SUCCESS) { |
| return status; |
| } |
| #endif |
| |
| // MaxTenuringThreshold=0 means NeverTenure=false && AlwaysTenure=true |
| if ((value == 0) && (NeverTenure || !AlwaysTenure)) { |
| JVMFlag::printError(verbose, |
| "MaxTenuringThreshold (0) should match to NeverTenure=false " |
| "&& AlwaysTenure=true. But we have NeverTenure=%s " |
| "AlwaysTenure=%s\n", |
| NeverTenure ? "true" : "false", |
| AlwaysTenure ? "true" : "false"); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } |
| return JVMFlag::SUCCESS; |
| } |
| |
| JVMFlag::Error MaxGCPauseMillisConstraintFunc(uintx value, bool verbose) { |
| #if INCLUDE_G1GC |
| JVMFlag::Error status = MaxGCPauseMillisConstraintFuncG1(value, verbose); |
| if (status != JVMFlag::SUCCESS) { |
| return status; |
| } |
| #endif |
| |
| return JVMFlag::SUCCESS; |
| } |
| |
| JVMFlag::Error GCPauseIntervalMillisConstraintFunc(uintx value, bool verbose) { |
| #if INCLUDE_G1GC |
| JVMFlag::Error status = GCPauseIntervalMillisConstraintFuncG1(value, verbose); |
| if (status != JVMFlag::SUCCESS) { |
| return status; |
| } |
| #endif |
| |
| return JVMFlag::SUCCESS; |
| } |
| |
| JVMFlag::Error InitialBootClassLoaderMetaspaceSizeConstraintFunc(size_t value, bool verbose) { |
| size_t aligned_max = align_down(max_uintx/2, Metaspace::reserve_alignment_words()); |
| if (value > aligned_max) { |
| JVMFlag::printError(verbose, |
| "InitialBootClassLoaderMetaspaceSize (" SIZE_FORMAT ") must be " |
| "less than or equal to aligned maximum value (" SIZE_FORMAT ")\n", |
| value, aligned_max); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } |
| return JVMFlag::SUCCESS; |
| } |
| |
| // To avoid an overflow by 'align_up(value, alignment)'. |
| static JVMFlag::Error MaxSizeForAlignment(const char* name, size_t value, size_t alignment, bool verbose) { |
| size_t aligned_max = ((max_uintx - alignment) & ~(alignment-1)); |
| if (value > aligned_max) { |
| JVMFlag::printError(verbose, |
| "%s (" SIZE_FORMAT ") must be " |
| "less than or equal to aligned maximum value (" SIZE_FORMAT ")\n", |
| name, value, aligned_max); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } |
| return JVMFlag::SUCCESS; |
| } |
| |
| static JVMFlag::Error MaxSizeForHeapAlignment(const char* name, size_t value, bool verbose) { |
| size_t heap_alignment; |
| |
| #if INCLUDE_G1GC |
| if (UseG1GC) { |
| // For G1 GC, we don't know until G1CollectorPolicy is created. |
| heap_alignment = MaxSizeForHeapAlignmentG1(); |
| } else |
| #endif |
| { |
| heap_alignment = CollectorPolicy::compute_heap_alignment(); |
| } |
| |
| return MaxSizeForAlignment(name, value, heap_alignment, verbose); |
| } |
| |
| JVMFlag::Error InitialHeapSizeConstraintFunc(size_t value, bool verbose) { |
| return MaxSizeForHeapAlignment("InitialHeapSize", value, verbose); |
| } |
| |
| JVMFlag::Error MaxHeapSizeConstraintFunc(size_t value, bool verbose) { |
| JVMFlag::Error status = MaxSizeForHeapAlignment("MaxHeapSize", value, verbose); |
| |
| if (status == JVMFlag::SUCCESS) { |
| status = CheckMaxHeapSizeAndSoftRefLRUPolicyMSPerMB(value, SoftRefLRUPolicyMSPerMB, verbose); |
| } |
| return status; |
| } |
| |
| JVMFlag::Error HeapBaseMinAddressConstraintFunc(size_t value, bool verbose) { |
| // If an overflow happened in Arguments::set_heap_size(), MaxHeapSize will have too large a value. |
| // Check for this by ensuring that MaxHeapSize plus the requested min base address still fit within max_uintx. |
| if (UseCompressedOops && FLAG_IS_ERGO(MaxHeapSize) && (value > (max_uintx - MaxHeapSize))) { |
| JVMFlag::printError(verbose, |
| "HeapBaseMinAddress (" SIZE_FORMAT ") or MaxHeapSize (" SIZE_FORMAT ") is too large. " |
| "Sum of them must be less than or equal to maximum of size_t (" SIZE_FORMAT ")\n", |
| value, MaxHeapSize, max_uintx); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } |
| |
| return MaxSizeForHeapAlignment("HeapBaseMinAddress", value, verbose); |
| } |
| |
| JVMFlag::Error NewSizeConstraintFunc(size_t value, bool verbose) { |
| #if INCLUDE_G1GC |
| JVMFlag::Error status = NewSizeConstraintFuncG1(value, verbose); |
| if (status != JVMFlag::SUCCESS) { |
| return status; |
| } |
| #endif |
| |
| return JVMFlag::SUCCESS; |
| } |
| |
| JVMFlag::Error MinTLABSizeConstraintFunc(size_t value, bool verbose) { |
| // At least, alignment reserve area is needed. |
| if (value < ThreadLocalAllocBuffer::alignment_reserve_in_bytes()) { |
| JVMFlag::printError(verbose, |
| "MinTLABSize (" SIZE_FORMAT ") must be " |
| "greater than or equal to reserved area in TLAB (" SIZE_FORMAT ")\n", |
| value, ThreadLocalAllocBuffer::alignment_reserve_in_bytes()); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } |
| if (value > (ThreadLocalAllocBuffer::max_size() * HeapWordSize)) { |
| JVMFlag::printError(verbose, |
| "MinTLABSize (" SIZE_FORMAT ") must be " |
| "less than or equal to ergonomic TLAB maximum (" SIZE_FORMAT ")\n", |
| value, ThreadLocalAllocBuffer::max_size() * HeapWordSize); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } |
| return JVMFlag::SUCCESS; |
| } |
| |
| JVMFlag::Error TLABSizeConstraintFunc(size_t value, bool verbose) { |
| // Skip for default value of zero which means set ergonomically. |
| if (FLAG_IS_CMDLINE(TLABSize)) { |
| if (value < MinTLABSize) { |
| JVMFlag::printError(verbose, |
| "TLABSize (" SIZE_FORMAT ") must be " |
| "greater than or equal to MinTLABSize (" SIZE_FORMAT ")\n", |
| value, MinTLABSize); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } |
| if (value > (ThreadLocalAllocBuffer::max_size() * HeapWordSize)) { |
| JVMFlag::printError(verbose, |
| "TLABSize (" SIZE_FORMAT ") must be " |
| "less than or equal to ergonomic TLAB maximum size (" SIZE_FORMAT ")\n", |
| value, (ThreadLocalAllocBuffer::max_size() * HeapWordSize)); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } |
| } |
| return JVMFlag::SUCCESS; |
| } |
| |
| // We will protect overflow from ThreadLocalAllocBuffer::record_slow_allocation(), |
| // so AfterMemoryInit type is enough to check. |
| JVMFlag::Error TLABWasteIncrementConstraintFunc(uintx value, bool verbose) { |
| if (UseTLAB) { |
| size_t refill_waste_limit = Thread::current()->tlab().refill_waste_limit(); |
| |
| // Compare with 'max_uintx' as ThreadLocalAllocBuffer::_refill_waste_limit is 'size_t'. |
| if (refill_waste_limit > (max_uintx - value)) { |
| JVMFlag::printError(verbose, |
| "TLABWasteIncrement (" UINTX_FORMAT ") must be " |
| "less than or equal to ergonomic TLAB waste increment maximum size(" SIZE_FORMAT ")\n", |
| value, (max_uintx - refill_waste_limit)); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } |
| } |
| return JVMFlag::SUCCESS; |
| } |
| |
| JVMFlag::Error SurvivorRatioConstraintFunc(uintx value, bool verbose) { |
| if (FLAG_IS_CMDLINE(SurvivorRatio) && |
| (value > (MaxHeapSize / Universe::heap()->collector_policy()->space_alignment()))) { |
| JVMFlag::printError(verbose, |
| "SurvivorRatio (" UINTX_FORMAT ") must be " |
| "less than or equal to ergonomic SurvivorRatio maximum (" SIZE_FORMAT ")\n", |
| value, |
| (MaxHeapSize / Universe::heap()->collector_policy()->space_alignment())); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } else { |
| return JVMFlag::SUCCESS; |
| } |
| } |
| |
| JVMFlag::Error MetaspaceSizeConstraintFunc(size_t value, bool verbose) { |
| if (value > MaxMetaspaceSize) { |
| JVMFlag::printError(verbose, |
| "MetaspaceSize (" SIZE_FORMAT ") must be " |
| "less than or equal to MaxMetaspaceSize (" SIZE_FORMAT ")\n", |
| value, MaxMetaspaceSize); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } else { |
| return JVMFlag::SUCCESS; |
| } |
| } |
| |
| JVMFlag::Error MaxMetaspaceSizeConstraintFunc(size_t value, bool verbose) { |
| if (value < MetaspaceSize) { |
| JVMFlag::printError(verbose, |
| "MaxMetaspaceSize (" SIZE_FORMAT ") must be " |
| "greater than or equal to MetaspaceSize (" SIZE_FORMAT ")\n", |
| value, MaxMetaspaceSize); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } else { |
| return JVMFlag::SUCCESS; |
| } |
| } |
| |
| JVMFlag::Error SurvivorAlignmentInBytesConstraintFunc(intx value, bool verbose) { |
| if (value != 0) { |
| if (!is_power_of_2(value)) { |
| JVMFlag::printError(verbose, |
| "SurvivorAlignmentInBytes (" INTX_FORMAT ") must be " |
| "power of 2\n", |
| value); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } |
| if (value < ObjectAlignmentInBytes) { |
| JVMFlag::printError(verbose, |
| "SurvivorAlignmentInBytes (" INTX_FORMAT ") must be " |
| "greater than or equal to ObjectAlignmentInBytes (" INTX_FORMAT ")\n", |
| value, ObjectAlignmentInBytes); |
| return JVMFlag::VIOLATES_CONSTRAINT; |
| } |
| } |
| return JVMFlag::SUCCESS; |
| } |
