Mercurial > hg > truffle
view src/share/vm/runtime/sweeper.hpp @ 2368:dde920245681
6896099: Integrate CMS heap ergo with default heap sizing ergo
6627787: CMS: JVM refuses to start up with -Xms16m -Xmx16m
7000125: CMS: Anti-monotone young gen sizing with respect to maximum whole heap size specification
7027529: CMS: retire CMSUseOldDefaults flag
Summary: Simplify CMS heap sizing code, relying on ergonomic initial sizing consistent with other collectors for the most part, controlling only young gen sizing to rein in pause times. Make CMS young gen sizing default statically cpu-dependant. Remove inconsistencies wrt generation sizing and policy code, allowing for the fixing for 6627787 and 7000125. For 7027529, retire the flag CMSUseOldDefaults which had been introduced as a bridge from JDK 5 to JDK 6 a number of years ago.
Reviewed-by: brutisso, poonam
author | ysr |
---|---|
date | Wed, 16 Mar 2011 10:37:08 -0700 |
parents | f95d63e2154a |
children | f52ed367b66d |
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/* * Copyright (c) 1997, 2010, 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. * */ #ifndef SHARE_VM_RUNTIME_SWEEPER_HPP #define SHARE_VM_RUNTIME_SWEEPER_HPP // An NmethodSweeper is an incremental cleaner for: // - cleanup inline caches // - reclamation of unreferences zombie nmethods // class NMethodSweeper : public AllStatic { static long _traversals; // Stack traversal count static nmethod* _current; // Current nmethod static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache static volatile int _invocations; // No. of invocations left until we are completed with this pass static volatile int _sweep_started; // Flag to control conc sweeper static bool _rescan; // Indicates that we should do a full rescan of the // of the code cache looking for work to do. static bool _do_sweep; // Flag to skip the conc sweep if no stack scan happened static int _locked_seen; // Number of locked nmethods encountered during the scan static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack static bool _was_full; // remember if we did emergency unloading static jint _advise_to_sweep; // flag to indicate code cache getting full static jlong _last_was_full; // timestamp of last emergency unloading static uint _highest_marked; // highest compile id dumped at last emergency unloading static long _was_full_traversal; // trav number at last emergency unloading static void process_nmethod(nmethod *nm); static void log_sweep(const char* msg, const char* format = NULL, ...); public: static long traversal_count() { return _traversals; } static void scan_stacks(); // Invoked at the end of each safepoint static void sweep_code_cache(); // Concurrent part of sweep job static void possibly_sweep(); // Compiler threads call this to sweep static void notify(nmethod* nm) { // Perform a full scan of the code cache from the beginning. No // need to synchronize the setting of this flag since it only // changes to false at safepoint so we can never overwrite it with false. _rescan = true; } static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure static void set_was_full(bool state) { _was_full = state; } static bool was_full() { return _was_full; } }; #endif // SHARE_VM_RUNTIME_SWEEPER_HPP