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7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed()) 7002546: regression on SpecJbb2005 on 7b118 comparing to 7b117 on small heaps Summary: Relaxed assertion checking related to incremental_collection_failed flag to allow for ExplicitGCInvokesConcurrent behaviour where we do not want a failing scavenge to bail to a stop-world collection. Parameterized incremental_collection_will_fail() so we can selectively use, or not use, as appropriate, the statistical prediction at specific use sites. This essentially reverts the scavenge bail-out logic to what it was prior to some recent changes that had inadvertently started using the statistical prediction which can be noisy in the presence of bursty loads. Added some associated verbose non-product debugging messages. Reviewed-by: johnc, tonyp
author ysr
date Tue, 07 Dec 2010 21:55:53 -0800
parents f95d63e2154a
children ee138854b3a6
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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_OPTO_PHASE_HPP
#define SHARE_VM_OPTO_PHASE_HPP

#include "libadt/port.hpp"
#include "runtime/timer.hpp"

class Compile;

//------------------------------Phase------------------------------------------
// Most optimizations are done in Phases.  Creating a phase does any long
// running analysis required, and caches the analysis in internal data
// structures.  Later the analysis is queried using transform() calls to
// guide transforming the program.  When the Phase is deleted, so is any
// cached analysis info.  This basic Phase class mostly contains timing and
// memory management code.
class Phase : public StackObj {
public:
  enum PhaseNumber {
    Compiler,                   // Top-level compiler phase
    Parser,                     // Parse bytecodes
    Remove_Useless,             // Remove useless nodes
    Optimistic,                 // Optimistic analysis phase
    GVN,                        // Pessimistic global value numbering phase
    Ins_Select,                 // Instruction selection phase
    CFG,                        // Build a CFG
    BlockLayout,                // Linear ordering of blocks
    Register_Allocation,        // Register allocation, duh
    LIVE,                       // Dragon-book LIVE range problem
    StringOpts,                 // StringBuilder related optimizations
    Interference_Graph,         // Building the IFG
    Coalesce,                   // Coalescing copies
    Ideal_Loop,                 // Find idealized trip-counted loops
    Macro_Expand,               // Expand macro nodes
    Peephole,                   // Apply peephole optimizations
    last_phase
  };
protected:
  enum PhaseNumber _pnum;       // Phase number (for stat gathering)

#ifndef PRODUCT
  static int _total_bytes_compiled;

  // accumulated timers
  static elapsedTimer _t_totalCompilation;
  static elapsedTimer _t_methodCompilation;
  static elapsedTimer _t_stubCompilation;
#endif

// The next timers used for LogCompilation
  static elapsedTimer _t_parser;
  static elapsedTimer _t_escapeAnalysis;
  static elapsedTimer _t_optimizer;
  static elapsedTimer   _t_idealLoop;
  static elapsedTimer   _t_ccp;
  static elapsedTimer _t_matcher;
  static elapsedTimer _t_registerAllocation;
  static elapsedTimer _t_output;

#ifndef PRODUCT
  static elapsedTimer _t_graphReshaping;
  static elapsedTimer _t_scheduler;
  static elapsedTimer _t_blockOrdering;
  static elapsedTimer _t_macroExpand;
  static elapsedTimer _t_peephole;
  static elapsedTimer _t_codeGeneration;
  static elapsedTimer _t_registerMethod;
  static elapsedTimer _t_temporaryTimer1;
  static elapsedTimer _t_temporaryTimer2;
  static elapsedTimer _t_idealLoopVerify;

// Subtimers for _t_optimizer
  static elapsedTimer   _t_iterGVN;
  static elapsedTimer   _t_iterGVN2;

// Subtimers for _t_registerAllocation
  static elapsedTimer   _t_ctorChaitin;
  static elapsedTimer   _t_buildIFGphysical;
  static elapsedTimer   _t_computeLive;
  static elapsedTimer   _t_regAllocSplit;
  static elapsedTimer   _t_postAllocCopyRemoval;
  static elapsedTimer   _t_fixupSpills;

// Subtimers for _t_output
  static elapsedTimer   _t_instrSched;
  static elapsedTimer   _t_buildOopMaps;
#endif
public:
  Compile * C;
  Phase( PhaseNumber pnum );
#ifndef PRODUCT
  static void print_timers();
#endif
};

#endif // SHARE_VM_OPTO_PHASE_HPP