Mercurial > hg > truffle
view src/share/vm/ci/ciMethodBlocks.hpp @ 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 | 194b8e3a2fc4 |
children | c18cbe5936b8 |
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/* * Copyright 2006-2008 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. * */ class ciBlock; typedef short ciBlockIndex; class ciMethodBlocks : public ResourceObj { private: ciMethod *_method; Arena *_arena; GrowableArray<ciBlock *> *_blocks; ciBlock **_bci_to_block; int _num_blocks; int _code_size; void do_analysis(); public: ciMethodBlocks(Arena *arena, ciMethod *meth); ciBlock *block_containing(int bci); ciBlock *block(int index) { return _blocks->at(index); } ciBlock *make_block_at(int bci); ciBlock *split_block_at(int bci); bool is_block_start(int bci); int num_blocks() { return _num_blocks;} void clear_processed(); ciBlock *make_dummy_block(); // a block not associated with a bci #ifndef PRODUCT void dump(); #endif }; class ciBlock : public ResourceObj { private: int _idx; int _start_bci; int _limit_bci; int _control_bci; uint _flags; int _ex_start_bci; int _ex_limit_bci; #ifndef PRODUCT ciMethod *_method; #endif enum { Processed = (1 << 0), Handler = (1 << 1), MayThrow = (1 << 2), DoesJsr = (1 << 3), DoesRet = (1 << 4), RetTarget = (1 << 5), HasHandler = (1 << 6) }; public: enum { fall_through_bci = -1 }; ciBlock(ciMethod *method, int index, int start_bci); int start_bci() const { return _start_bci; } int limit_bci() const { return _limit_bci; } int control_bci() const { return _control_bci; } int index() const { return _idx; } void set_start_bci(int bci) { _start_bci = bci; } void set_limit_bci(int bci) { _limit_bci = bci; } void set_control_bci(int bci) { _control_bci = bci;} void set_exception_range(int start_bci, int limit_bci); int ex_start_bci() const { return _ex_start_bci; } int ex_limit_bci() const { return _ex_limit_bci; } bool contains(int bci) const { return start_bci() <= bci && bci < limit_bci(); } // flag handling bool processed() const { return (_flags & Processed) != 0; } bool is_handler() const { return (_flags & Handler) != 0; } bool may_throw() const { return (_flags & MayThrow) != 0; } bool does_jsr() const { return (_flags & DoesJsr) != 0; } bool does_ret() const { return (_flags & DoesRet) != 0; } bool has_handler() const { return (_flags & HasHandler) != 0; } bool is_ret_target() const { return (_flags & RetTarget) != 0; } void set_processed() { _flags |= Processed; } void clear_processed() { _flags &= ~Processed; } void set_handler() { _flags |= Handler; } void set_may_throw() { _flags |= MayThrow; } void set_does_jsr() { _flags |= DoesJsr; } void clear_does_jsr() { _flags &= ~DoesJsr; } void set_does_ret() { _flags |= DoesRet; } void clear_does_ret() { _flags &= ~DoesRet; } void set_is_ret_target() { _flags |= RetTarget; } void set_has_handler() { _flags |= HasHandler; } void clear_exception_handler() { _flags &= ~Handler; _ex_start_bci = -1; _ex_limit_bci = -1; } #ifndef PRODUCT ciMethod *method() const { return _method; } void dump(); void print_on(outputStream* st) const PRODUCT_RETURN; #endif };