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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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19
hotspot/src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp
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@ -265,6 +265,11 @@ bool PSScavenge::invoke_no_policy() {
young_gen->eden_space()->accumulate_statistics();
}
if (ZapUnusedHeapArea) {
// Save information needed to minimize mangling
heap->record_gen_tops_before_GC();
}
if (PrintHeapAtGC) {
Universe::print_heap_before_gc();
}
@ -315,7 +320,7 @@ bool PSScavenge::invoke_no_policy() {
if (!ScavengeWithObjectsInToSpace) {
assert(young_gen->to_space()->is_empty(),
"Attempt to scavenge with live objects in to_space");
young_gen->to_space()->clear();
young_gen->to_space()->clear(SpaceDecorator::Mangle);
} else if (ZapUnusedHeapArea) {
young_gen->to_space()->mangle_unused_area();
}
@ -437,8 +442,10 @@ bool PSScavenge::invoke_no_policy() {
if (!promotion_failure_occurred) {
// Swap the survivor spaces.
young_gen->eden_space()->clear();
young_gen->from_space()->clear();
young_gen->eden_space()->clear(SpaceDecorator::Mangle);
young_gen->from_space()->clear(SpaceDecorator::Mangle);
young_gen->swap_spaces();
size_t survived = young_gen->from_space()->used_in_bytes();
@ -600,6 +607,12 @@ bool PSScavenge::invoke_no_policy() {
Universe::print_heap_after_gc();
}
if (ZapUnusedHeapArea) {
young_gen->eden_space()->check_mangled_unused_area_complete();
young_gen->from_space()->check_mangled_unused_area_complete();
young_gen->to_space()->check_mangled_unused_area_complete();
}
scavenge_exit.update();
if (PrintGCTaskTimeStamps) {