jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/ageTable.cpp@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) 1997, 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 #include "precompiled.hpp"

    26 #include "gc_implementation/shared/ageTable.hpp"

    27 #include "gc_implementation/shared/gcPolicyCounters.hpp"

    28 #include "memory/collectorPolicy.hpp"

    29 #include "memory/resourceArea.hpp"

    30 #include "memory/sharedHeap.hpp"

    31 #include "utilities/copy.hpp"

    33 /* Copyright (c) 1992-2009 Oracle and/or its affiliates, and Stanford University.

    34    See the LICENSE file for license information. */

    36 ageTable::ageTable(bool global) {

    38   clear();

    40   if (UsePerfData && global) {

    42     ResourceMark rm;

    43     EXCEPTION_MARK;

    45     const char* agetable_ns = "generation.0.agetable";

    46     const char* bytes_ns = PerfDataManager::name_space(agetable_ns, "bytes");

    48     for(int age = 0; age < table_size; age ++) {

    49       char age_name[10];

    50       jio_snprintf(age_name, sizeof(age_name), "%2.2d", age);

    51       const char* cname = PerfDataManager::counter_name(bytes_ns, age_name);

    52       _perf_sizes[age] = PerfDataManager::create_variable(SUN_GC, cname,

    53                                                           PerfData::U_Bytes,

    54                                                           CHECK);

    55     }

    57     const char* cname = PerfDataManager::counter_name(agetable_ns, "size");

    58     PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None,

    59                                      table_size, CHECK);

    60   }

    61 }

    63 void ageTable::clear() {

    64   for (size_t* p = sizes; p < sizes + table_size; ++p) {

    65     *p = 0;

    66   }

    67 }

    69 void ageTable::merge(ageTable* subTable) {

    70   for (int i = 0; i < table_size; i++) {

    71     sizes[i]+= subTable->sizes[i];

    72   }

    73 }

    75 void ageTable::merge_par(ageTable* subTable) {

    76   for (int i = 0; i < table_size; i++) {

    77     Atomic::add_ptr(subTable->sizes[i], &sizes[i]);

    78   }

    79 }

    81 int ageTable::compute_tenuring_threshold(size_t survivor_capacity) {

    82   size_t desired_survivor_size = (size_t)((((double) survivor_capacity)*TargetSurvivorRatio)/100);

    83   size_t total = 0;

    84   int age = 1;

    85   assert(sizes[0] == 0, "no objects with age zero should be recorded");

    86   while (age < table_size) {

    87     total += sizes[age];

    88     // check if including objects of age 'age' made us pass the desired

    89     // size, if so 'age' is the new threshold

    90     if (total > desired_survivor_size) break;

    91     age++;

    92   }

    93   int result = age < MaxTenuringThreshold ? age : MaxTenuringThreshold;

    95   if (PrintTenuringDistribution || UsePerfData) {

    97     if (PrintTenuringDistribution) {

    98       gclog_or_tty->cr();

    99       gclog_or_tty->print_cr("Desired survivor size %ld bytes, new threshold %d (max %d)",

   100         desired_survivor_size*oopSize, result, MaxTenuringThreshold);

   101     }

   103     total = 0;

   104     age = 1;

   105     while (age < table_size) {

   106       total += sizes[age];

   107       if (sizes[age] > 0) {

   108         if (PrintTenuringDistribution) {

   109           gclog_or_tty->print_cr("- age %3d: %10ld bytes, %10ld total",

   110             age, sizes[age]*oopSize, total*oopSize);

   111         }

   112       }

   113       if (UsePerfData) {

   114         _perf_sizes[age]->set_value(sizes[age]*oopSize);

   115       }

   116       age++;

   117     }

   118     if (UsePerfData) {

   119       SharedHeap* sh = SharedHeap::heap();

   120       CollectorPolicy* policy = sh->collector_policy();

   121       GCPolicyCounters* gc_counters = policy->counters();

   122       gc_counters->tenuring_threshold()->set_value(result);

   123       gc_counters->desired_survivor_size()->set_value(

   124         desired_survivor_size*oopSize);

   125     }

   126   }

   128   return result;

   129 }

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

src/share/vm/gc_implementation/shared/ageTable.cpp@b2ef234911c9

src/share/vm/gc_implementation/shared/ageTable.cpp