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6896603: CMS/GCH: collection_attempt_is_safe() ergo should use more recent data

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Deprecated HandlePromotionFailure, removing the ability to turn off that feature, did away with one epoch look-ahead when deciding if a scavenge is likely to fail, relying on current data.

Reviewed-by: jmasa, johnc, poonam
This commit is contained in:
Y. Srinivas Ramakrishna 2010-10-23 23:03:49 -07:00
parent 554e77efb4
commit cbc7f8756a
14 changed files with 101 additions and 222 deletions
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14
hotspot/src/share/vm/memory/genCollectedHeap.cpp
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@ -142,8 +142,7 @@ jint GenCollectedHeap::initialize() {
}
_perm_gen = perm_gen_spec->init(heap_rs, PermSize, rem_set());
clear_incremental_collection_will_fail();
clear_last_incremental_collection_failed();
clear_incremental_collection_failed();
#ifndef SERIALGC
// If we are running CMS, create the collector responsible
@ -1347,17 +1346,6 @@ class GenGCEpilogueClosure: public GenCollectedHeap::GenClosure {
};
void GenCollectedHeap::gc_epilogue(bool full) {
// Remember if a partial collection of the heap failed, and
// we did a complete collection.
if (full && incremental_collection_will_fail()) {
set_last_incremental_collection_failed();
} else {
clear_last_incremental_collection_failed();
}
// Clear the flag, if set; the generation gc_epilogues will set the
// flag again if the condition persists despite the collection.
clear_incremental_collection_will_fail();
#ifdef COMPILER2
assert(DerivedPointerTable::is_empty(), "derived pointer present");
size_t actual_gap = pointer_delta((HeapWord*) (max_uintx-3), *(end_addr()));