Mercurial > hg > graal-jvmci-8
diff src/share/vm/gc_implementation/g1/g1ErgoVerbose.hpp @ 3914:20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
Summary: It introduces ergonomic decision logging in G1 for the following heuristics: heap sizing, collection set construction, concurrent cycle initiation, and partially-young GC start/end. The code has a bit of refactoring in a few places to make the decision logging possible. It also replaces alternative ad-hoc logging that we have under different parameters and switches (G1_DEBUG, G1PolicyVerbose).
Reviewed-by: johnc, ysr
author | tonyp |
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date | Wed, 07 Sep 2011 12:21:23 -0400 |
parents | |
children | f1b4e0e0bdad |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/g1/g1ErgoVerbose.hpp Wed Sep 07 12:21:23 2011 -0400 @@ -0,0 +1,197 @@ +/* + * Copyright (c) 2011, 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_GC_IMPLEMENTATION_G1_G1ERGOVERBOSE_HPP +#define SHARE_VM_GC_IMPLEMENTATION_G1_G1ERGOVERBOSE_HPP + +#include "memory/allocation.hpp" +#include "utilities/debug.hpp" + +// The log of G1's heuristic decisions comprises of a series of +// records which have a similar format in order to maintain +// consistency across records and ultimately easier parsing of the +// output, if we ever choose to do that. Each record consists of: +// * A time stamp to be able to easily correlate each record with +// other events. +// * A unique string to allow us to easily identify such records. +// * The name of the heuristic the record corresponds to. +// * An action string which describes the action that G1 did or is +// about to do. +// * An optional reason string which describes the reason for the +// action. +// * An optional number of name/value pairs which contributed to the +// decision to take the action described in the record. +// +// Each record is associated with a "tag" which is the combination of +// the heuristic the record corresponds to, as well as the min level +// of verboseness at which the record should be printed. The tag is +// checked against the current settings to determine whether the record +// should be printed or not. + +// The available verboseness levels. +typedef enum { + // Determine which part of the tag is occupied by the level. + ErgoLevelShift = 8, + ErgoLevelMask = ~((1 << ErgoLevelShift) - 1), + + // ErgoLow is 0 so that we don't have to explicitly or a heuristic + // id with ErgoLow to keep its use simpler. + ErgoLow = 0, + ErgoHigh = 1 << ErgoLevelShift, +} ErgoLevel; + +// The available heuristics. +typedef enum { + // Determines which part of the tag is occupied by the heuristic id. + ErgoHeuristicMask = ~ErgoLevelMask, + + ErgoHeapSizing = 0, + ErgoCSetConstruction, + ErgoConcCycles, + ErgoPartiallyYoungGCs, + + ErgoHeuristicNum +} ErgoHeuristic; + +class G1ErgoVerbose : AllStatic { +private: + // Determines the minimum verboseness level at which records will be + // printed. + static ErgoLevel _level; + // Determines which heuristics are currently enabled. + static bool _enabled[ErgoHeuristicNum]; + + static ErgoLevel extract_level(int tag) { + return (ErgoLevel) (tag & ErgoLevelMask); + } + + static ErgoHeuristic extract_heuristic(int tag) { + return (ErgoHeuristic) (tag & ErgoHeuristicMask); + } + +public: + // Needs to be explicitly called at GC initialization. + static void initialize(); + + static void set_level(ErgoLevel level); + static void set_enabled(ErgoHeuristic h, bool enabled); + // It is applied to all heuristics. + static void set_enabled(bool enabled); + + static bool enabled(int tag) { + ErgoLevel level = extract_level(tag); + ErgoHeuristic n = extract_heuristic(tag); + return level <= _level && _enabled[n]; + } + + // Extract the heuristic id from the tag and return a string with + // its name. + static const char* to_string(int tag); +}; + +// The macros below generate the format string for values of different +// types and/or metrics. + +// The reason for the action is optional and is handled specially: the +// reason string is concatenated here so it's not necessary to pass it +// as a parameter. +#define ergo_format_reason(_reason_) ", reason: " _reason_ + +// Single parameter format strings +#define ergo_format_str(_name_) ", " _name_ ": %s" +#define ergo_format_region(_name_) ", " _name_ ": "SIZE_FORMAT" regions" +#define ergo_format_byte(_name_) ", " _name_ ": "SIZE_FORMAT" bytes" +#define ergo_format_double(_name_) ", " _name_ ": %1.2f" +#define ergo_format_perc(_name_) ", " _name_ ": %1.2f %%" +#define ergo_format_ms(_name_) ", " _name_ ": %1.2f ms" + +// Double parameter format strings +#define ergo_format_byte_perc(_name_) \ + ", " _name_ ": "SIZE_FORMAT" bytes (%1.2f %%)" + +// Generates the format string +#define ergo_format(_action_, _extra_format_) \ + " %1.3f: [G1Ergonomics (%s) " _action_ _extra_format_ "]" + +// Conditionally, prints an ergonomic decision record. _extra_format_ +// is the format string for the optional items we'd like to print +// (i.e., the decision's reason and any associated values). This +// string should be built up using the ergo_*_format macros (see +// above) to ensure consistency. +// +// Since we cannot rely on the compiler supporting variable argument +// macros, this macro accepts a fixed number of arguments and passes +// them to the print method. For convenience, we have wrapper macros +// below which take a specific number of arguments and set the rest to +// a default value. +#define ergo_verbose_common(_tag_, _action_, _extra_format_, \ + _arg0_, _arg1_, _arg2_, _arg3_, _arg4_, _arg5_) \ + do { \ + if (G1ErgoVerbose::enabled((_tag_))) { \ + gclog_or_tty->print_cr(ergo_format(_action_, _extra_format_), \ + os::elapsedTime(), \ + G1ErgoVerbose::to_string((_tag_)), \ + (_arg0_), (_arg1_), (_arg2_), \ + (_arg3_), (_arg4_), (_arg5_)); \ + } \ + } while (0) + + +#define ergo_verbose(_tag_, _action_) \ + ergo_verbose_common(_tag_, _action_, "", 0, 0, 0, 0, 0, 0) + +#define ergo_verbose0(_tag_, _action_, _extra_format_) \ + ergo_verbose_common(_tag_, _action_, _extra_format_, 0, 0, 0, 0, 0, 0) + +#define ergo_verbose1(_tag_, _action_, _extra_format_, \ + _arg0_) \ + ergo_verbose_common(_tag_, _action_, _extra_format_, \ + _arg0_, 0, 0, 0, 0, 0) + +#define ergo_verbose2(_tag_, _action_, _extra_format_, \ + _arg0_, _arg1_) \ + ergo_verbose_common(_tag_, _action_, _extra_format_, \ + _arg0_, _arg1_, 0, 0, 0, 0) + +#define ergo_verbose3(_tag_, _action_, _extra_format_, \ + _arg0_, _arg1_, _arg2_) \ + ergo_verbose_common(_tag_, _action_, _extra_format_, \ + _arg0_, _arg1_, _arg2_, 0, 0, 0) + +#define ergo_verbose4(_tag_, _action_, _extra_format_, \ + _arg0_, _arg1_, _arg2_, _arg3_) \ + ergo_verbose_common(_tag_, _action_, _extra_format_, \ + _arg0_, _arg1_, _arg2_, _arg3_, 0, 0) + +#define ergo_verbose5(_tag_, _action_, _extra_format_, \ + _arg0_, _arg1_, _arg2_, _arg3_, _arg4_) \ + ergo_verbose_common(_tag_, _action_, _extra_format_, \ + _arg0_, _arg1_, _arg2_, _arg3_, _arg4_, 0) + +#define ergo_verbose6(_tag_, _action_, _extra_format_, \ + _arg0_, _arg1_, _arg2_, _arg3_, _arg4_, _arg5_) \ + ergo_verbose_common(_tag_, _action_, _extra_format_, \ + _arg0_, _arg1_, _arg2_, _arg3_, _arg4_, _arg5_) + +#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ERGOVERBOSE_HPP