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6631166: CMS: better heuristics when combatting fragmentation

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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
This commit is contained in:
Y. Srinivas Ramakrishna 2009-12-23 09:23:54 -08:00
parent 1383dc414b
commit 272a6d47bb
26 changed files with 1099 additions and 345 deletions
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10
hotspot/src/share/vm/memory/defNewGeneration.cpp
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@ -609,7 +609,7 @@ void DefNewGeneration::collect(bool full,
remove_forwarding_pointers();
if (PrintGCDetails) {
gclog_or_tty->print(" (promotion failed)");
gclog_or_tty->print(" (promotion failed) ");
}
// Add to-space to the list of space to compact
// when a promotion failure has occurred. In that
@ -620,6 +620,9 @@ void DefNewGeneration::collect(bool full,
from()->set_next_compaction_space(to());
gch->set_incremental_collection_will_fail();
// Inform the next generation that a promotion failure occurred.
_next_gen->promotion_failure_occurred();
// Reset the PromotionFailureALot counters.
NOT_PRODUCT(Universe::heap()->reset_promotion_should_fail();)
}
@ -679,6 +682,11 @@ void DefNewGeneration::preserve_mark_if_necessary(oop obj, markOop m) {
void DefNewGeneration::handle_promotion_failure(oop old) {
preserve_mark_if_necessary(old, old->mark());
if (!_promotion_failed && PrintPromotionFailure) {
gclog_or_tty->print(" (promotion failure size = " SIZE_FORMAT ") ",
old->size());
}
// forward to self
old->forward_to(old);
_promotion_failed = true;