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view src/cpu/x86/vm/c1_FpuStackSim_x86.hpp @ 1837:c99c53f07c14
6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
Summary: Inserted missing yield(check)s in closures used during the work-stealing phase of parallel concurrent marking, a missing synchronous yield-request in the cms perm gen allocation path, and a terminator-terminator for the offer_termination invocation that monitors the yield status of the concurrent marking task. Elaborated some documentation comments and made some task queue termination loop flags configurable at start-up to aid debugging in the field.
Reviewed-by: jmasa, johnc, poonam
author | ysr |
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date | Wed, 29 Sep 2010 16:17:02 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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/* * Copyright (c) 2005, 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. * */ // Simulates the FPU stack and maintains mapping [fpu-register -> stack offset] // FPU registers are described as numbers from 0..nof_fpu_regs-1 class Compilation; class FpuStackSim VALUE_OBJ_CLASS_SPEC { private: Compilation* _compilation; int _stack_size; int _regs[FrameMap::nof_fpu_regs]; int tos_index() const { return _stack_size - 1; } int regs_at(int i) const; void set_regs_at(int i, int val); void dec_stack_size(); void inc_stack_size(); // unified bailout support Compilation* compilation() const { return _compilation; } void bailout(const char* msg) const { compilation()->bailout(msg); } bool bailed_out() const { return compilation()->bailed_out(); } public: FpuStackSim(Compilation* compilation); void pop (); void pop (int rnr); // rnr must be on tos void push(int rnr); void swap(int offset); // exchange tos with tos + offset int offset_from_tos(int rnr) const; // return the offset of the topmost instance of rnr from TOS int get_slot(int tos_offset) const; // return the entry at the given offset from TOS void set_slot(int tos_offset, int rnr); // set the entry at the given offset from TOS void rename(int old_rnr, int new_rnr); // rename all instances of old_rnr to new_rnr bool contains(int rnr); // debugging support only bool is_empty(); bool slot_is_empty(int tos_offset); int stack_size() const { return _stack_size; } void clear(); intArray* write_state(); void read_state(intArray* fpu_stack_state); void print() PRODUCT_RETURN; };