jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/gSpaceCounters.hpp@b2ef234911c9

7190666: G1: assert(_unused == 0) failed: Inconsistency in PLAB stats
Summary: Reset the fields in ParGCAllocBuffer, that are used for accumulating values for the ResizePLAB sensors in PLABStats, to zero after flushing the values to the PLABStats fields. Flush PLABStats values only when retiring the final allocation buffers prior to disposing of a G1ParScanThreadState object, rather than when retiring every allocation buffer.
Reviewed-by: jwilhelm, jmasa, ysr

     1 /*

     2  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_GSPACECOUNTERS_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_GSPACECOUNTERS_HPP

    28 #ifndef SERIALGC

    29 #include "gc_implementation/shared/generationCounters.hpp"

    30 #include "memory/generation.hpp"

    31 #include "runtime/perfData.hpp"

    32 #endif

    34 // A GSpaceCounter is a holder class for performance counters

    35 // that track a space;

    37 class GSpaceCounters: public CHeapObj<mtGC> {

    38   friend class VMStructs;

    40  private:

    41   PerfVariable*      _capacity;

    42   PerfVariable*      _used;

    44   // Constant PerfData types don't need to retain a reference.

    45   // However, it's a good idea to document them here.

    46   // PerfConstant*     _size;

    48   Generation*       _gen;

    49   char*             _name_space;

    51  public:

    53   GSpaceCounters(const char* name, int ordinal, size_t max_size, Generation* g,

    54                  GenerationCounters* gc, bool sampled=true);

    56   ~GSpaceCounters() {

    57     if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space, mtGC);

    58   }

    60   inline void update_capacity() {

    61     _capacity->set_value(_gen->capacity());

    62   }

    64   inline void update_used() {

    65     _used->set_value(_gen->used());

    66   }

    68   // special version of update_used() to allow the used value to be

    69   // passed as a parameter. This method can can be used in cases were

    70   // the  utilization is already known and/or when the _gen->used()

    71   // method is known to be expensive and we want to avoid unnecessary

    72   // calls to it.

    73   //

    74   inline void update_used(size_t used) {

    75     _used->set_value(used);

    76   }

    78   inline void inc_used(size_t size) {

    79     _used->inc(size);

    80   }

    82   debug_only(

    83     // for security reasons, we do not allow arbitrary reads from

    84     // the counters as they may live in shared memory.

    85     jlong used() {

    86       return _used->get_value();

    87     }

    88     jlong capacity() {

    89       return _used->get_value();

    90     }

    91   )

    93   inline void update_all() {

    94     update_used();

    95     update_capacity();

    96   }

    98   const char* name_space() const        { return _name_space; }

    99 };

   101 class GenerationUsedHelper : public PerfLongSampleHelper {

   102   private:

   103     Generation* _gen;

   105   public:

   106     GenerationUsedHelper(Generation* g) : _gen(g) { }

   108     inline jlong take_sample() {

   109       return _gen->used();

   110     }

   111 };

   113 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_GSPACECOUNTERS_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/gc_implementation/shared/gSpaceCounters.hpp@b2ef234911c9

src/share/vm/gc_implementation/shared/gSpaceCounters.hpp