Mercurial > hg > graal-compiler
view src/share/vm/runtime/sweeper.hpp @ 3405:8cbcd406c42e
7042740: CMS: assert(n> q) failed: Looping at: ... blockOffsetTable.cpp:557
Summary: Do a one-step look-ahead, when sweeping free or garbage blocks, to avoid overstepping sweep limit, which may become a non-block-boundary because of a heap expansion delta coalescing with a previously co-terminal free block.
Reviewed-by: brutisso, tonyp
author | ysr |
---|---|
date | Fri, 27 May 2011 15:05:33 -0700 |
parents | f52ed367b66d |
children | da91efe96a93 |
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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; } #ifdef ASSERT // Keep track of sweeper activity in the ring buffer static void record_sweep(nmethod* nm, int line); static void report_events(int id, address entry); static void report_events(); #endif 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