jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1HRPrinter.hpp@e7d0505c8a30 (annotated)

src/share/vm/gc_implementation/g1/g1HRPrinter.hpp@e7d0505c8a30 (annotated)

src/share/vm/gc_implementation/g1/g1HRPrinter.hpp

Fri, 10 Oct 2014 15:51:58 +0200

author: tschatzl
date: Fri, 10 Oct 2014 15:51:58 +0200
changeset 7257: e7d0505c8a30
parent 0: f90c822e73f8
permissions: -rw-r--r--

8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso

 /*
  * 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_G1HRPRINTER_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1HRPRINTER_HPP
 #include "memory/allocation.hpp"
 #include "gc_implementation/g1/heapRegion.hpp"
 #define SKIP_RETIRED_FULL_REGIONS 1
 class G1HRPrinter VALUE_OBJ_CLASS_SPEC {
 public:
   typedef enum {
     Alloc,
     AllocForce,
     Retire,
     Reuse,
     CSet,
     EvacFailure,
     Cleanup,
     PostCompaction,
     Commit,
     Uncommit
   } ActionType;
   typedef enum {
     Unset,
     Eden,
     Survivor,
     Old,
     SingleHumongous,
     StartsHumongous,
     ContinuesHumongous
   } RegionType;
   typedef enum {
     StartGC,
     EndGC,
     StartFullGC,
     EndFullGC
   } PhaseType;
 private:
   bool _active;
   static const char* action_name(ActionType action);
   static const char* region_type_name(RegionType type);
   static const char* phase_name(PhaseType phase);
   // Print an action event. This version is used in most scenarios and
   // only prints the region's bottom. The parameters type and top are
   // optional (the "not set" values are Unset and NULL).
   static void print(ActionType action, RegionType type,
                     HeapRegion* hr, HeapWord* top);
   // Print an action event. This version prints both the region's
   // bottom and end. Used for Commit / Uncommit events.
   static void print(ActionType action, HeapWord* bottom, HeapWord* end);
   // Print a phase event.
   static void print(PhaseType phase, size_t phase_num);
 public:
   // In some places we iterate over a list in order to generate output
   // for the list's elements. By exposing this we can avoid this
   // iteration if the printer is not active.
   const bool is_active() { return _active; }
   // Have to set this explicitly as we have to do this during the
   // heap's initialize() method, not in the constructor.
   void set_active(bool active) { _active = active; }
   // The methods below are convenient wrappers for the print() methods.
   void alloc(HeapRegion* hr, RegionType type, bool force = false) {
     if (is_active()) {
       print((!force) ? Alloc : AllocForce, type, hr, NULL);
     }
   }
   void alloc(RegionType type, HeapRegion* hr, HeapWord* top) {
     if (is_active()) {
       print(Alloc, type, hr, top);
     }
   }
   void retire(HeapRegion* hr) {
     if (is_active()) {
       if (!SKIP_RETIRED_FULL_REGIONS || hr->top() < hr->end()) {
         print(Retire, Unset, hr, hr->top());
       }
     }
   }
   void reuse(HeapRegion* hr) {
     if (is_active()) {
       print(Reuse, Unset, hr, NULL);
     }
   }
   void cset(HeapRegion* hr) {
     if (is_active()) {
       print(CSet, Unset, hr, NULL);
     }
   }
   void evac_failure(HeapRegion* hr) {
     if (is_active()) {
       print(EvacFailure, Unset, hr, NULL);
     }
   }
   void cleanup(HeapRegion* hr) {
     if (is_active()) {
       print(Cleanup, Unset, hr, NULL);
     }
   }
   void post_compaction(HeapRegion* hr, RegionType type) {
     if (is_active()) {
       print(PostCompaction, type, hr, hr->top());
     }
   }
   void commit(HeapWord* bottom, HeapWord* end) {
     if (is_active()) {
       print(Commit, bottom, end);
     }
   }
   void uncommit(HeapWord* bottom, HeapWord* end) {
     if (is_active()) {
       print(Uncommit, bottom, end);
     }
   }
   void start_gc(bool full, size_t gc_num) {
     if (is_active()) {
       if (!full) {
         print(StartGC, gc_num);
       } else {
         print(StartFullGC, gc_num);
       }
     }
   }
   void end_gc(bool full, size_t gc_num) {
     if (is_active()) {
       if (!full) {
         print(EndGC, gc_num);
       } else {
         print(EndFullGC, gc_num);
       }
     }
   }
   G1HRPrinter() : _active(false) { }
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1HRPRINTER_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/g1HRPrinter.hpp@e7d0505c8a30 (annotated)

src/share/vm/gc_implementation/g1/g1HRPrinter.hpp