Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/parallelScavenge/psPermGen.cpp @ 3772:6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
Summary: Perform a heap verification after the first phase of G1's full GC using objects' mark words to determine liveness. The third parameter of the heap verification routines, which was used in G1 to determine which marking bitmap to use in liveness calculations, has been changed from a boolean to an enum with values defined for using the mark word, and the 'prev' and 'next' bitmaps.
Reviewed-by: tonyp, ysr
| author | johnc |
|---|---|
| date | Tue, 14 Jun 2011 11:01:10 -0700 |
| parents | eda9eb483d29 |
| children | c9ca3f51cf41 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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6841742: par compact - remove unused/unsupported options
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" | |
| 27 #include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" | |
| 28 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" | |
| 29 #include "gc_implementation/parallelScavenge/psPermGen.hpp" | |
| 30 #include "gc_implementation/shared/gcUtil.hpp" | |
| 31 #include "gc_implementation/shared/markSweep.inline.hpp" | |
| 32 #include "oops/markOop.inline.hpp" | |
| 0 | 33 |
| 34 PSPermGen::PSPermGen(ReservedSpace rs, size_t alignment, | |
| 35 size_t initial_size, size_t min_size, size_t max_size, | |
| 36 const char* gen_name, int level) : | |
| 37 PSOldGen(rs, alignment, initial_size, min_size, max_size, gen_name, level), | |
| 38 _last_used(0) | |
| 39 { | |
| 40 assert(object_mark_sweep() != NULL, "Sanity"); | |
| 41 | |
| 42 object_mark_sweep()->set_allowed_dead_ratio(PermMarkSweepDeadRatio); | |
| 43 _avg_size = new AdaptivePaddedAverage(AdaptivePermSizeWeight, | |
| 44 PermGenPadding); | |
| 45 } | |
| 46 | |
| 47 HeapWord* PSPermGen::allocate_permanent(size_t size) { | |
| 48 assert_locked_or_safepoint(Heap_lock); | |
| 49 HeapWord* obj = allocate_noexpand(size, false); | |
| 50 | |
| 51 if (obj == NULL) { | |
| 52 obj = expand_and_allocate(size, false); | |
| 53 } | |
| 54 | |
| 55 return obj; | |
| 56 } | |
| 57 | |
| 58 void PSPermGen::compute_new_size(size_t used_before_collection) { | |
| 59 // Update our padded average of objects allocated in perm | |
| 60 // gen between collections. | |
| 61 assert(used_before_collection >= _last_used, | |
| 62 "negative allocation amount since last GC?"); | |
| 63 | |
| 64 const size_t alloc_since_last_gc = used_before_collection - _last_used; | |
| 65 _avg_size->sample(alloc_since_last_gc); | |
| 66 | |
| 67 const size_t current_live = used_in_bytes(); | |
| 68 // Stash away the current amount live for the next call to this method. | |
| 69 _last_used = current_live; | |
| 70 | |
| 71 // We have different alignment constraints than the rest of the heap. | |
| 72 const size_t alignment = MAX2(MinPermHeapExpansion, | |
| 73 virtual_space()->alignment()); | |
| 74 | |
| 75 // Compute the desired size: | |
| 76 // The free space is the newly computed padded average, | |
| 77 // so the desired size is what's live + the free space. | |
| 78 size_t desired_size = current_live + (size_t)_avg_size->padded_average(); | |
| 79 desired_size = align_size_up(desired_size, alignment); | |
| 80 | |
| 81 // ...and no larger or smaller than our max and min allowed. | |
| 82 desired_size = MAX2(MIN2(desired_size, _max_gen_size), _min_gen_size); | |
| 83 assert(desired_size <= _max_gen_size, "just checking"); | |
| 84 | |
| 85 const size_t size_before = _virtual_space->committed_size(); | |
| 86 | |
| 87 if (desired_size == size_before) { | |
| 88 // no change, we're done | |
| 89 return; | |
| 90 } | |
| 91 | |
| 92 { | |
| 93 // We'll be growing or shrinking the heap: in either case, | |
| 94 // we need to hold a lock. | |
| 95 MutexLocker x(ExpandHeap_lock); | |
| 96 if (desired_size > size_before) { | |
| 97 const size_t change_bytes = desired_size - size_before; | |
| 98 const size_t aligned_change_bytes = | |
| 99 align_size_up(change_bytes, alignment); | |
| 100 expand_by(aligned_change_bytes); | |
| 101 } else { | |
| 102 // Shrinking | |
| 103 const size_t change_bytes = | |
| 104 size_before - desired_size; | |
| 105 const size_t aligned_change_bytes = align_size_down(change_bytes, alignment); | |
| 106 shrink(aligned_change_bytes); | |
| 107 } | |
| 108 } | |
| 109 | |
| 110 // While this code isn't controlled by AdaptiveSizePolicy, it's | |
| 111 // convenient to see all resizing decsions under the same flag. | |
| 112 if (PrintAdaptiveSizePolicy) { | |
| 113 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); | |
| 114 assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); | |
| 115 | |
| 116 gclog_or_tty->print_cr("AdaptiveSizePolicy::perm generation size: " | |
| 117 "collection: %d " | |
| 118 "(" SIZE_FORMAT ") -> (" SIZE_FORMAT ") ", | |
| 119 heap->total_collections(), | |
| 120 size_before, _virtual_space->committed_size()); | |
| 121 } | |
| 122 } | |
| 123 | |
| 124 void PSPermGen::precompact() { | |
| 125 // Reset start array first. | |
| 126 _start_array.reset(); | |
| 127 object_mark_sweep()->precompact(); | |
| 128 } |