hotspot/src/share/vm/gc_implementation/g1/g1ErgoVerbose.hpp
author tonyp
Tue, 08 Nov 2011 00:41:28 -0500
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child 11249 b0c1cc35cafe
permissions -rw-r--r--
7099849: G1: include heap region information in hs_err files Reviewed-by: johnc, brutisso, poonam
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/*
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 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1ERGOVERBOSE_HPP
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#define SHARE_VM_GC_IMPLEMENTATION_G1_G1ERGOVERBOSE_HPP
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#include "memory/allocation.hpp"
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#include "utilities/debug.hpp"
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// The log of G1's heuristic decisions comprises of a series of
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// records which have a similar format in order to maintain
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// consistency across records and ultimately easier parsing of the
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// output, if we ever choose to do that. Each record consists of:
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// * A time stamp to be able to easily correlate each record with
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// other events.
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// * A unique string to allow us to easily identify such records.
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// * The name of the heuristic the record corresponds to.
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// * An action string which describes the action that G1 did or is
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// about to do.
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// * An optional reason string which describes the reason for the
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// action.
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// * An optional number of name/value pairs which contributed to the
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// decision to take the action described in the record.
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//
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// Each record is associated with a "tag" which is the combination of
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// the heuristic the record corresponds to, as well as the min level
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// of verboseness at which the record should be printed. The tag is
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// checked against the current settings to determine whether the record
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// should be printed or not.
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// The available verboseness levels.
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typedef enum {
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  // Determine which part of the tag is occupied by the level.
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  ErgoLevelShift = 8,
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  ErgoLevelMask = ~((1 << ErgoLevelShift) - 1),
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  // ErgoLow is 0 so that we don't have to explicitly or a heuristic
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  // id with ErgoLow to keep its use simpler.
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  ErgoLow = 0,
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  ErgoHigh = 1 << ErgoLevelShift
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} ErgoLevel;
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// The available heuristics.
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typedef enum {
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  // Determines which part of the tag is occupied by the heuristic id.
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  ErgoHeuristicMask = ~ErgoLevelMask,
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  ErgoHeapSizing = 0,
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  ErgoCSetConstruction,
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  ErgoConcCycles,
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  ErgoPartiallyYoungGCs,
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  ErgoHeuristicNum
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} ErgoHeuristic;
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class G1ErgoVerbose : AllStatic {
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private:
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  // Determines the minimum verboseness level at which records will be
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  // printed.
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  static ErgoLevel _level;
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  // Determines which heuristics are currently enabled.
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  static bool _enabled[ErgoHeuristicNum];
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  static ErgoLevel extract_level(int tag) {
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    return (ErgoLevel) (tag & ErgoLevelMask);
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  }
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  static ErgoHeuristic extract_heuristic(int tag) {
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    return (ErgoHeuristic) (tag & ErgoHeuristicMask);
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  }
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public:
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  // Needs to be explicitly called at GC initialization.
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  static void initialize();
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  static void set_level(ErgoLevel level);
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  static void set_enabled(ErgoHeuristic h, bool enabled);
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  // It is applied to all heuristics.
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  static void set_enabled(bool enabled);
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  static bool enabled(int tag) {
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    ErgoLevel level = extract_level(tag);
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    ErgoHeuristic n = extract_heuristic(tag);
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    return level <= _level && _enabled[n];
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  }
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  // Extract the heuristic id from the tag and return a string with
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  // its name.
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  static const char* to_string(int tag);
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};
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// The macros below generate the format string for values of different
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// types and/or metrics.
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// The reason for the action is optional and is handled specially: the
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// reason string is concatenated here so it's not necessary to pass it
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// as a parameter.
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#define ergo_format_reason(_reason_) ", reason: " _reason_
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// Single parameter format strings
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#define ergo_format_str(_name_)      ", " _name_ ": %s"
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#define ergo_format_region(_name_)   ", " _name_ ": "SIZE_FORMAT" regions"
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#define ergo_format_byte(_name_)     ", " _name_ ": "SIZE_FORMAT" bytes"
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#define ergo_format_double(_name_)   ", " _name_ ": %1.2f"
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#define ergo_format_perc(_name_)     ", " _name_ ": %1.2f %%"
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#define ergo_format_ms(_name_)       ", " _name_ ": %1.2f ms"
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// Double parameter format strings
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#define ergo_format_byte_perc(_name_)                                   \
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                             ", " _name_ ": "SIZE_FORMAT" bytes (%1.2f %%)"
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// Generates the format string
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#define ergo_format(_action_, _extra_format_)                   \
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  " %1.3f: [G1Ergonomics (%s) " _action_ _extra_format_ "]"
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// Conditionally, prints an ergonomic decision record. _extra_format_
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// is the format string for the optional items we'd like to print
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// (i.e., the decision's reason and any associated values). This
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// string should be built up using the ergo_*_format macros (see
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// above) to ensure consistency.
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//
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// Since we cannot rely on the compiler supporting variable argument
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// macros, this macro accepts a fixed number of arguments and passes
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// them to the print method. For convenience, we have wrapper macros
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// below which take a specific number of arguments and set the rest to
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// a default value.
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#define ergo_verbose_common(_tag_, _action_, _extra_format_,            \
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                            _arg0_, _arg1_, _arg2_, _arg3_, _arg4_, _arg5_) \
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  do {                                                                  \
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    if (G1ErgoVerbose::enabled((_tag_))) {                              \
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      gclog_or_tty->print_cr(ergo_format(_action_, _extra_format_),     \
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                             os::elapsedTime(),                         \
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                             G1ErgoVerbose::to_string((_tag_)),         \
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                             (_arg0_), (_arg1_), (_arg2_),              \
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                             (_arg3_), (_arg4_), (_arg5_));             \
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    }                                                                   \
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  } while (0)
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#define ergo_verbose(_tag_, _action_)                           \
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  ergo_verbose_common(_tag_, _action_, "", 0, 0, 0, 0, 0, 0)
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#define ergo_verbose0(_tag_, _action_, _extra_format_)                  \
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  ergo_verbose_common(_tag_, _action_, _extra_format_, 0, 0, 0, 0, 0, 0)
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#define ergo_verbose1(_tag_, _action_, _extra_format_,                  \
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                      _arg0_)                                           \
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  ergo_verbose_common(_tag_, _action_, _extra_format_,                  \
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                      _arg0_, 0, 0, 0, 0, 0)
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#define ergo_verbose2(_tag_, _action_, _extra_format_,                  \
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                      _arg0_, _arg1_)                                   \
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  ergo_verbose_common(_tag_, _action_, _extra_format_,                  \
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                      _arg0_, _arg1_, 0, 0, 0, 0)
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#define ergo_verbose3(_tag_, _action_, _extra_format_,                  \
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                      _arg0_, _arg1_, _arg2_)                           \
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  ergo_verbose_common(_tag_, _action_, _extra_format_,                  \
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                      _arg0_, _arg1_, _arg2_, 0, 0, 0)
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#define ergo_verbose4(_tag_, _action_, _extra_format_,                  \
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                      _arg0_, _arg1_, _arg2_, _arg3_)                   \
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  ergo_verbose_common(_tag_, _action_, _extra_format_,                  \
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                      _arg0_, _arg1_, _arg2_, _arg3_, 0, 0)
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#define ergo_verbose5(_tag_, _action_, _extra_format_,                  \
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                      _arg0_, _arg1_, _arg2_, _arg3_, _arg4_)           \
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  ergo_verbose_common(_tag_, _action_, _extra_format_,                  \
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                      _arg0_, _arg1_, _arg2_, _arg3_, _arg4_, 0)
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#define ergo_verbose6(_tag_, _action_, _extra_format_,                  \
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                      _arg0_, _arg1_, _arg2_, _arg3_, _arg4_, _arg5_)   \
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  ergo_verbose_common(_tag_, _action_, _extra_format_,                  \
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                      _arg0_, _arg1_, _arg2_, _arg3_, _arg4_, _arg5_)
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ERGOVERBOSE_HPP