Mercurial > hg > graal-compiler
annotate src/share/vm/memory/permGen.hpp @ 1839: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
| author | ysr |
|---|---|
| date | Fri, 01 Oct 2010 16:12:54 -0700 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
1839
e41cd7fd68a6
6794422: Perm gen expansion policy for concurrent collectors
ysr
parents:
1552
diff
changeset
|
2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
605
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
605
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
605
diff
changeset
|
21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 // All heaps contains a "permanent generation," containing permanent | |
| 26 // (reflective) objects. This is like a regular generation in some ways, | |
| 27 // but unlike one in others, and so is split apart. | |
| 28 | |
| 29 class Generation; | |
| 30 class GenRemSet; | |
| 31 class CSpaceCounters; | |
| 32 | |
|
1839
e41cd7fd68a6
6794422: Perm gen expansion policy for concurrent collectors
ysr
parents:
1552
diff
changeset
|
33 // PermGen models the part of the heap used to allocate class meta-data. |
| 0 | 34 |
| 35 class PermGen : public CHeapObj { | |
| 36 friend class VMStructs; | |
| 37 protected: | |
| 38 size_t _capacity_expansion_limit; // maximum expansion allowed without a | |
| 605 | 39 // full gc occurring |
|
1839
e41cd7fd68a6
6794422: Perm gen expansion policy for concurrent collectors
ysr
parents:
1552
diff
changeset
|
40 void set_capacity_expansion_limit(size_t limit) { |
|
e41cd7fd68a6
6794422: Perm gen expansion policy for concurrent collectors
ysr
parents:
1552
diff
changeset
|
41 assert_locked_or_safepoint(Heap_lock); |
|
e41cd7fd68a6
6794422: Perm gen expansion policy for concurrent collectors
ysr
parents:
1552
diff
changeset
|
42 _capacity_expansion_limit = limit; |
|
e41cd7fd68a6
6794422: Perm gen expansion policy for concurrent collectors
ysr
parents:
1552
diff
changeset
|
43 } |
| 0 | 44 |
|
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
|
45 HeapWord* mem_allocate_in_gen(size_t size, Generation* gen); |
|
1839
e41cd7fd68a6
6794422: Perm gen expansion policy for concurrent collectors
ysr
parents:
1552
diff
changeset
|
46 // Along with mem_allocate_in_gen() above, implements policy for |
|
e41cd7fd68a6
6794422: Perm gen expansion policy for concurrent collectors
ysr
parents:
1552
diff
changeset
|
47 // "scheduling" allocation/expansion/collection of the perm gen. |
|
e41cd7fd68a6
6794422: Perm gen expansion policy for concurrent collectors
ysr
parents:
1552
diff
changeset
|
48 // The virtual method request_...() below can be overridden by |
|
e41cd7fd68a6
6794422: Perm gen expansion policy for concurrent collectors
ysr
parents:
1552
diff
changeset
|
49 // subtypes that want to implement a different expansion/collection |
|
e41cd7fd68a6
6794422: Perm gen expansion policy for concurrent collectors
ysr
parents:
1552
diff
changeset
|
50 // policy from the default provided. |
|
e41cd7fd68a6
6794422: Perm gen expansion policy for concurrent collectors
ysr
parents:
1552
diff
changeset
|
51 virtual HeapWord* request_expand_and_allocate(Generation* gen, size_t size, |
|
e41cd7fd68a6
6794422: Perm gen expansion policy for concurrent collectors
ysr
parents:
1552
diff
changeset
|
52 GCCause::Cause prev_cause); |
|
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
|
53 |
| 0 | 54 public: |
| 55 enum Name { | |
| 56 MarkSweepCompact, MarkSweep, ConcurrentMarkSweep | |
| 57 }; | |
| 58 | |
| 59 // Permanent allocation (initialized) | |
| 60 virtual HeapWord* mem_allocate(size_t size) = 0; | |
| 61 | |
| 62 // Mark sweep support | |
| 63 virtual void compute_new_size() = 0; | |
| 64 | |
| 65 // Ideally, we would use MI (IMHO) but we'll do delegation instead. | |
| 66 virtual Generation* as_gen() const = 0; | |
| 67 | |
| 68 virtual void oop_iterate(OopClosure* cl) { | |
| 69 Generation* g = as_gen(); | |
| 70 assert(g != NULL, "as_gen() NULL"); | |
| 71 g->oop_iterate(cl); | |
| 72 } | |
| 73 | |
| 74 virtual void object_iterate(ObjectClosure* cl) { | |
| 75 Generation* g = as_gen(); | |
| 76 assert(g != NULL, "as_gen() NULL"); | |
| 77 g->object_iterate(cl); | |
| 78 } | |
| 79 | |
| 80 // Performance Counter support | |
| 81 virtual void update_counters() { | |
| 82 Generation* g = as_gen(); | |
| 83 assert(g != NULL, "as_gen() NULL"); | |
| 84 g->update_counters(); | |
| 85 } | |
| 86 }; |