jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.cpp@e41cd7fd68a6

6794422: Perm gen expansion policy for concurrent collectors
Summary: Concurrent collectors should expand the perm gen without a full STW GC, but possibly by triggering a concurrent collection. Temporary band-aid for G1 where no concurrent collection is kicked off since the perm gen is not collected concurrently.
Reviewed-by: johnc

     1 /*

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     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

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     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  *

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    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

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    23  */

    25 #include "incls/_precompiled.incl"

    26 #include "incls/_cmsPermGen.cpp.incl"

    28 CMSPermGen::CMSPermGen(ReservedSpace rs, size_t initial_byte_size,

    29              CardTableRS* ct,

    30              FreeBlockDictionary::DictionaryChoice dictionaryChoice) {

    31   CMSPermGenGen* g =

    32     new CMSPermGenGen(rs, initial_byte_size, -1, ct);

    33   if (g == NULL) {

    34     vm_exit_during_initialization("Could not allocate a CompactingPermGen");

    35   }

    37   g->initialize_performance_counters();

    39   _gen = g;

    40 }

    42 HeapWord* CMSPermGen::mem_allocate(size_t size) {

    43   Mutex* lock = _gen->freelistLock();

    44   bool lock_owned = lock->owned_by_self();

    45   if (lock_owned) {

    46     MutexUnlocker mul(lock);

    47     return mem_allocate_in_gen(size, _gen);

    48   } else {

    49     return mem_allocate_in_gen(size, _gen);

    50   }

    51 }

    53 HeapWord* CMSPermGen::request_expand_and_allocate(Generation* gen,

    54                                                   size_t size,

    55                                                   GCCause::Cause prev_cause /* ignored */) {

    56   HeapWord* obj = gen->expand_and_allocate(size, false);

    57   if (gen->capacity() >= _capacity_expansion_limit) {

    58     set_capacity_expansion_limit(gen->capacity() + MaxPermHeapExpansion);

    59     assert(((ConcurrentMarkSweepGeneration*)gen)->should_concurrent_collect(),

    60            "Should kick off a collection if one not in progress");

    61   }

    62   return obj;

    63 }

    65 void CMSPermGen::compute_new_size() {

    66   _gen->compute_new_size();

    67 }

    69 void CMSPermGenGen::initialize_performance_counters() {

    71   const char* gen_name = "perm";

    73   // Generation Counters - generation 2, 1 subspace

    74   _gen_counters = new GenerationCounters(gen_name, 2, 1, &_virtual_space);

    76   _gc_counters = NULL;

    78   _space_counters = new GSpaceCounters(gen_name, 0,

    79                                        _virtual_space.reserved_size(),

    80                                        this, _gen_counters);

    81 }

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

src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.cpp@e41cd7fd68a6

src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.cpp