Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.cpp @ 1145:e018e6884bd8
6631166: CMS: better heuristics when combatting fragmentation
Summary: Autonomic per-worker free block cache sizing, tunable coalition policies, fixes to per-size block statistics, retuned gain and bandwidth of some feedback loop filters to allow quicker reactivity to abrupt changes in ambient demand, and other heuristics to reduce fragmentation of the CMS old gen. Also tightened some assertions, including those related to locking.
Reviewed-by: jmasa
| author | ysr |
|---|---|
| date | Wed, 23 Dec 2009 09:23:54 -0800 |
| parents | c0492d52d55b |
| children | c18cbe5936b8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright (c) 2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_cmsPermGen.cpp.incl" | |
| 27 | |
| 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 } | |
| 36 | |
| 37 g->initialize_performance_counters(); | |
| 38 | |
| 39 _gen = g; | |
| 40 } | |
| 41 | |
| 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); | |
|
139
c0492d52d55b
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
0
diff
changeset
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47 return mem_allocate_in_gen(size, _gen); |
| 0 | 48 } else { |
|
139
c0492d52d55b
6539517: CR 6186200 should be extended to perm gen allocation to prevent spurious OOM's from perm gen
apetrusenko
parents:
0
diff
changeset
|
49 return mem_allocate_in_gen(size, _gen); |
| 0 | 50 } |
| 51 } | |
| 52 | |
| 53 void CMSPermGen::compute_new_size() { | |
| 54 _gen->compute_new_size(); | |
| 55 } | |
| 56 | |
| 57 void CMSPermGenGen::initialize_performance_counters() { | |
| 58 | |
| 59 const char* gen_name = "perm"; | |
| 60 | |
| 61 // Generation Counters - generation 2, 1 subspace | |
| 62 _gen_counters = new GenerationCounters(gen_name, 2, 1, &_virtual_space); | |
| 63 | |
| 64 _gc_counters = NULL; | |
| 65 | |
| 66 _space_counters = new GSpaceCounters(gen_name, 0, | |
| 67 _virtual_space.reserved_size(), | |
| 68 this, _gen_counters); | |
| 69 } |