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6672698: mangle_unused_area() should not remangle the entire heap at each collection

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Maintain a high water mark for the allocations in a space and mangle only up to that high water mark.

Reviewed-by: ysr, apetrusenko
This commit is contained in:
Jon Masamitsu 2008-07-09 15:08:55 -07:00
parent 0d9452401c
commit 18dbebd143
43 changed files with 1299 additions and 206 deletions
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16
hotspot/src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp
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@ -98,6 +98,9 @@ void PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) {
// Increment the invocation count
heap->increment_total_collections(true /* full */);
// Save information needed to minimize mangling
heap->record_gen_tops_before_GC();
// We need to track unique mark sweep invocations as well.
_total_invocations++;
@ -188,6 +191,12 @@ void PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) {
deallocate_stacks();
if (ZapUnusedHeapArea) {
// Do a complete mangle (top to end) because the usage for
// scratch does not maintain a top pointer.
young_gen->to_space()->mangle_unused_area_complete();
}
eden_empty = young_gen->eden_space()->is_empty();
if (!eden_empty) {
eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen);
@ -198,7 +207,7 @@ void PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) {
Universe::update_heap_info_at_gc();
survivors_empty = young_gen->from_space()->is_empty() &&
young_gen->to_space()->is_empty();
young_gen->to_space()->is_empty();
young_gen_empty = eden_empty && survivors_empty;
BarrierSet* bs = heap->barrier_set();
@ -344,6 +353,11 @@ void PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) {
perm_gen->verify_object_start_array();
}
if (ZapUnusedHeapArea) {
old_gen->object_space()->check_mangled_unused_area_complete();
perm_gen->object_space()->check_mangled_unused_area_complete();
}
NOT_PRODUCT(ref_processor()->verify_no_references_recorded());
if (PrintHeapAtGC) {