Mercurial > hg > graal-compiler
view src/share/vm/runtime/statSampler.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 | f95d63e2154a |
children |
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/* * Copyright (c) 2001, 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_STATSAMPLER_HPP #define SHARE_VM_RUNTIME_STATSAMPLER_HPP #include "runtime/perfData.hpp" #include "runtime/task.hpp" class StatSamplerTask; /* * The StatSampler class is responsible for periodically updating * sampled PerfData instances and writing the sampled values to the * PerfData memory region. * * In addition it is also responsible for providing a home for * PerfData instances that otherwise have no better home. */ class StatSampler : AllStatic { friend class StatSamplerTask; private: static StatSamplerTask* _task; static PerfDataList* _sampled; static void collect_sample(); static void create_misc_perfdata(); static void create_sampled_perfdata(); static void sample_data(PerfDataList* list); static const char* get_system_property(const char* name, TRAPS); static void create_system_property_instrumentation(TRAPS); public: // Start/stop the sampler static void engage(); static void disengage(); static bool is_active() { return _task != NULL; } static void initialize(); static void destroy(); }; void statSampler_exit(); #endif // SHARE_VM_RUNTIME_STATSAMPLER_HPP