/* * Copyright (c) 2016, Red Hat, Inc. and/or its affiliates. * * 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_VM_GC_SHENANDOAH_SHENANDOAH_GLOBALS_HPP #define SHARE_VM_GC_SHENANDOAH_SHENANDOAH_GLOBALS_HPP #include "runtime/globals.hpp" #define SHENANDOAH_FLAGS(develop, \ develop_pd, \ product, \ product_pd, \ diagnostic, \ experimental, \ notproduct, \ manageable, \ product_rw, \ range, \ constraint, \ writeable) \ \ product(bool, UseShenandoahGC, false, \ "Use the Shenandoah garbage collector") \ \ product(bool, ShenandoahOptimizeFinals, true, \ "Optimize barriers on final and stable fields/arrays. " \ "Turn it off for maximum compatibility with reflection or JNI " \ "code that manipulates final fields." \ "Defaults to true. ") \ \ product(size_t, ShenandoahHeapRegionSize, 0, \ "Size of the Shenandoah regions. " \ "Determined automatically by default.") \ \ experimental(size_t, ShenandoahMinRegionSize, 256 * K, \ "Minimum heap region size. ") \ \ experimental(size_t, ShenandoahMaxRegionSize, 32 * M, \ "Maximum heap region size. ") \ \ experimental(size_t, ShenandoahTargetNumRegions, 2048, \ "Target number of regions. We try to get around that many " \ "regions, based on ShenandoahMinRegionSize and " \ "ShenandoahMaxRegionSizeSize. ") \ \ product(bool, UseShenandoahMatrix, false, \ "Keep a connection matrix and use this to drive collection sets") \ \ product(bool, PrintShenandoahMatrix, false, \ "Print connection matrix after marking") \ \ product(bool, VerifyShenandoahMatrix, false, \ "Verify connection matrix after marking") \ \ product(ccstr, ShenandoahGCHeuristics, "adaptive", \ "The heuristics to use in Shenandoah GC. Possible values: " \ "dynamic, adaptive, aggressive." \ "Defaults to adaptive") \ \ product(uintx, ShenandoahRefProcFrequency, 5, \ "How often should (weak, soft, etc) references be processed. " \ "References get processed at every Nth GC cycle. " \ "Set to 0 to disable reference processing. " \ "Defaults to process references every 5 cycles.") \ \ product(uintx, ShenandoahUnloadClassesFrequency, 5, \ "How often should classes get unloaded. " \ "Class unloading is performed at every Nth GC cycle. " \ "Set to 0 to disable concurrent class unloading. " \ "Defaults to unload classes every 5 cycles.") \ \ experimental(uintx, ShenandoahFullGCThreshold, 3, \ "How many cycles in a row to do degenerated marking on " \ "cancelled GC before triggering a full-gc" \ "Defaults to 3") \ writeable(Always) \ \ product_rw(uintx, ShenandoahGarbageThreshold, 60, \ "Sets the percentage of garbage a region need to contain before " \ "it can be marked for collection. Applies to " \ "Shenandoah GC dynamic Heuristic mode only (ignored otherwise). " \ "Defaults to 60%.") \ range(0,100) \ \ product_rw(uintx, ShenandoahFreeThreshold, 10, \ "Set the percentage of free heap at which a GC cycle is started. " \ "Applies to Shenandoah GC dynamic Heuristic mode only " \ "(ignored otherwise). Defaults to 10%.") \ range(0,100) \ \ product_rw(uintx, ShenandoahCSetThreshold, 40, \ "Set the approximate target percentage of the heap for the" \ "collection set. Defaults to 40%.") \ range(0,100) \ \ product_rw(uintx, ShenandoahAllocationThreshold, 0, \ "Set percentage of memory allocated since last GC cycle before " \ "a new GC cycle is started. " \ "Applies to Shenandoah GC dynamic Heuristic mode only " \ "(ignored otherwise). Defauls to 0%.") \ range(0,100) \ \ experimental(uintx, ShenandoahInitFreeThreshold, 10, \ "Initial remaininig free threshold for adaptive heuristics") \ range(0,100) \ \ experimental(uintx, ShenandoahMinFreeThreshold, 3, \ "Minimum remaininig free threshold for adaptive heuristics") \ range(0,100) \ \ experimental(uintx, ShenandoahMaxFreeThreshold, 70, \ "Maximum remaininig free threshold for adaptive heuristics") \ range(0,100) \ \ experimental(uintx, ShenandoahHappyCyclesThreshold, 5, \ "How many successful marking cycles before improving free " \ "threshold for adaptive heuristics") \ \ experimental(uint, ShenandoahMarkLoopStride, 1000, \ "How many items are processed during one marking step") \ \ experimental(bool, ShenandoahConcurrentCodeRoots, true, \ "Scan code roots concurrently, instead of during a pause") \ \ experimental(bool, ShenandoahNoBarriersForConst, true, \ "Constant oops don't need barriers") \ \ experimental(bool, ShenandoahDontIncreaseWBFreq, true, \ "Common 2 WriteBarriers or WriteBarrier and a ReadBarrier only " \ "if the resulting WriteBarrier isn't executed more frequently") \ \ experimental(bool, ShenandoahNoLivenessFullGC, true, \ "Skip liveness counting for mark during full GC.") \ \ experimental(bool, ShenandoahWriteBarrierToIR, true, \ "Convert write barrier to IR instead of using assembly blob") \ \ experimental(bool, ShenandoahWriteBarrierCsetTestInIR, true, \ "Perform cset test in IR rather than in the stub") \ \ experimental(bool, ShenandoahLoopOptsAfterExpansion, true, \ "Attempt more loop opts after write barrier expansion") \ \ experimental(bool, UseShenandoahOWST, true, \ "Use Shenandoah work stealing termination protocol") \ \ experimental(size_t, ShenandoahSATBBufferSize, 1 * K, \ "Number of entries in an SATB log buffer.") \ range(1, max_uintx) \ \ experimental(int, ShenandoahRegionSamplingRate, 40, \ "Sampling rate for heap region sampling. " \ "Number of milliseconds between samples") \ writeable(Always) \ \ experimental(bool, ShenandoahRegionSampling, false, \ "Turns on heap region sampling via JVMStat") \ writeable(Always) \ \ experimental(bool, ShenandoahReduceStoreValBarrier, false, \ "If true, only execute storeval barrier when updating " \ "references.") \ \ diagnostic(bool, ShenandoahWriteBarrier, true, \ "Turn on/off write barriers in Shenandoah") \ \ diagnostic(bool, ShenandoahReadBarrier, true, \ "Turn on/off read barriers in Shenandoah") \ \ diagnostic(bool, ShenandoahCASBarrier, true, \ "Turn on/off CAS barriers in Shenandoah") \ \ diagnostic(bool, ShenandoahAcmpBarrier, true, \ "Turn on/off acmp barriers in Shenandoah") \ \ diagnostic(bool, ShenandoahCloneBarrier, true, \ "Turn on/off clone barriers in Shenandoah") \ \ diagnostic(bool, ShenandoahStoreCheck, false, \ "Emit additional code that checks objects are written to only" \ " in to-space") \ \ develop(bool, ShenandoahDumpHeapBeforeConcurrentMark, false, \ "Dump the ShenanodahHeap Before Each ConcurrentMark") \ \ develop(bool, ShenandoahDumpHeapAfterConcurrentMark, false, \ "Dump the ShenanodahHeap After Each Concurrent Mark") \ \ develop(bool, ShenandoahVerifyWritesToFromSpace, false, \ "Use Memory Protection to signal illegal writes to from space") \ \ develop(bool, ShenandoahVerifyReadsToFromSpace, false, \ "Use Memory Protection to signal illegal reads to from space") \ \ develop(bool, ShenandoahVerify, false, \ "Verify the Shenandoah garbage collector") \ \ develop(bool, VerifyStrictOopOperations, false, \ "Verify that == and != are not used on oops. Only in fastdebug") \ \ develop(bool, ShenandoahVerifyOptoBarriers, false, \ "Verify no missing barriers in c2") \ \ product(bool, ShenandoahAlwaysPreTouch, false, \ "Pre-touch heap memory, overrides global AlwaysPreTouch") \ \ experimental(intx, ShenandoahMarkScanPrefetch, 32, \ "How many objects to prefetch ahead when traversing mark bitmaps." \ "Set to 0 to disable prefetching.") \ range(0, 1024) \ \ experimental(intx, ShenandoahFullGCTries, 3, \ "How many times to try to do Full GC on allocation failure." \ "Set to 0 to never try, and fail instead.") \ range(0, 16) \ SHENANDOAH_FLAGS(DECLARE_DEVELOPER_FLAG, \ DECLARE_PD_DEVELOPER_FLAG, \ DECLARE_PRODUCT_FLAG, \ DECLARE_PD_PRODUCT_FLAG, \ DECLARE_DIAGNOSTIC_FLAG, \ DECLARE_EXPERIMENTAL_FLAG, \ DECLARE_NOTPRODUCT_FLAG, \ DECLARE_MANAGEABLE_FLAG, \ DECLARE_PRODUCT_RW_FLAG, \ IGNORE_RANGE, \ IGNORE_CONSTRAINT, \ IGNORE_WRITEABLE) #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAH_GLOBALS_HPP