Mercurial > hg > graal-jvmci-8
view src/share/vm/memory/generationSpec.cpp @ 1145:e018e6884bd8
6631166: CMS: better heuristics when combatting fragmentation
Summary: Autonomic per-worker free block cache sizing, tunable coalition policies, fixes to per-size block statistics, retuned gain and bandwidth of some feedback loop filters to allow quicker reactivity to abrupt changes in ambient demand, and other heuristics to reduce fragmentation of the CMS old gen. Also tightened some assertions, including those related to locking.
Reviewed-by: jmasa
author | ysr |
---|---|
date | Wed, 23 Dec 2009 09:23:54 -0800 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
line wrap: on
line source
/* * Copyright 2001-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ # include "incls/_precompiled.incl" # include "incls/_generationSpec.cpp.incl" Generation* GenerationSpec::init(ReservedSpace rs, int level, GenRemSet* remset) { switch (name()) { case Generation::DefNew: return new DefNewGeneration(rs, init_size(), level); case Generation::MarkSweepCompact: return new TenuredGeneration(rs, init_size(), level, remset); #ifndef SERIALGC case Generation::ParNew: return new ParNewGeneration(rs, init_size(), level); case Generation::ASParNew: return new ASParNewGeneration(rs, init_size(), init_size() /* min size */, level); case Generation::ConcurrentMarkSweep: { assert(UseConcMarkSweepGC, "UseConcMarkSweepGC should be set"); CardTableRS* ctrs = remset->as_CardTableRS(); if (ctrs == NULL) { vm_exit_during_initialization("Rem set incompatibility."); } // Otherwise // The constructor creates the CMSCollector if needed, // else registers with an existing CMSCollector ConcurrentMarkSweepGeneration* g = NULL; g = new ConcurrentMarkSweepGeneration(rs, init_size(), level, ctrs, UseCMSAdaptiveFreeLists, (FreeBlockDictionary::DictionaryChoice)CMSDictionaryChoice); g->initialize_performance_counters(); return g; } case Generation::ASConcurrentMarkSweep: { assert(UseConcMarkSweepGC, "UseConcMarkSweepGC should be set"); CardTableRS* ctrs = remset->as_CardTableRS(); if (ctrs == NULL) { vm_exit_during_initialization("Rem set incompatibility."); } // Otherwise // The constructor creates the CMSCollector if needed, // else registers with an existing CMSCollector ASConcurrentMarkSweepGeneration* g = NULL; g = new ASConcurrentMarkSweepGeneration(rs, init_size(), level, ctrs, UseCMSAdaptiveFreeLists, (FreeBlockDictionary::DictionaryChoice)CMSDictionaryChoice); g->initialize_performance_counters(); return g; } #endif // SERIALGC default: guarantee(false, "unrecognized GenerationName"); return NULL; } } PermanentGenerationSpec::PermanentGenerationSpec(PermGen::Name name, size_t init_size, size_t max_size, size_t read_only_size, size_t read_write_size, size_t misc_data_size, size_t misc_code_size) { _name = name; _init_size = init_size; if (UseSharedSpaces || DumpSharedSpaces) { _enable_shared_spaces = true; if (UseSharedSpaces) { // Override shared space sizes from those in the file. FileMapInfo* mapinfo = FileMapInfo::current_info(); _read_only_size = mapinfo->space_capacity(CompactingPermGenGen::ro); _read_write_size = mapinfo->space_capacity(CompactingPermGenGen::rw); _misc_data_size = mapinfo->space_capacity(CompactingPermGenGen::md); _misc_code_size = mapinfo->space_capacity(CompactingPermGenGen::mc); } else { _read_only_size = read_only_size; _read_write_size = read_write_size; _misc_data_size = misc_data_size; _misc_code_size = misc_code_size; } } else { _enable_shared_spaces = false; _read_only_size = 0; _read_write_size = 0; _misc_data_size = 0; _misc_code_size = 0; } _max_size = max_size; } PermGen* PermanentGenerationSpec::init(ReservedSpace rs, size_t init_size, GenRemSet *remset) { // Break the reserved spaces into pieces for the permanent space // and the shared spaces. ReservedSpace perm_rs = rs.first_part(_max_size, UseSharedSpaces, UseSharedSpaces); ReservedSpace shared_rs = rs.last_part(_max_size); if (enable_shared_spaces()) { if (!perm_rs.is_reserved() || perm_rs.base() + perm_rs.size() != shared_rs.base()) { FileMapInfo* mapinfo = FileMapInfo::current_info(); mapinfo->fail_continue("Sharing disabled - unable to " "reserve address space."); shared_rs.release(); disable_sharing(); } } switch (name()) { case PermGen::MarkSweepCompact: return new CompactingPermGen(perm_rs, shared_rs, init_size, remset, this); #ifndef SERIALGC case PermGen::MarkSweep: guarantee(false, "NYI"); return NULL; case PermGen::ConcurrentMarkSweep: { assert(UseConcMarkSweepGC, "UseConcMarkSweepGC should be set"); CardTableRS* ctrs = remset->as_CardTableRS(); if (ctrs == NULL) { vm_exit_during_initialization("RemSet/generation incompatibility."); } // XXXPERM return new CMSPermGen(perm_rs, init_size, ctrs, (FreeBlockDictionary::DictionaryChoice)CMSDictionaryChoice); } #endif // SERIALGC default: guarantee(false, "unrecognized GenerationName"); return NULL; } } // Alignment void PermanentGenerationSpec::align(size_t alignment) { _init_size = align_size_up(_init_size, alignment); _max_size = align_size_up(_max_size, alignment); _read_only_size = align_size_up(_read_only_size, alignment); _read_write_size = align_size_up(_read_write_size, alignment); _misc_data_size = align_size_up(_misc_data_size, alignment); _misc_code_size = align_size_up(_misc_code_size, alignment); assert(enable_shared_spaces() || (_read_only_size + _read_write_size == 0), "Shared space when disabled?"); }