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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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36
hotspot/src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp
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@ -1058,6 +1058,10 @@ void PSParallelCompact::post_compact()
ref_processor()->enqueue_discovered_references(NULL);
if (ZapUnusedHeapArea) {
heap->gen_mangle_unused_area();
}
// Update time of last GC
reset_millis_since_last_gc();
}
@ -1959,6 +1963,11 @@ void PSParallelCompact::invoke_no_policy(bool maximum_heap_compaction) {
PSPermGen* perm_gen = heap->perm_gen();
PSAdaptiveSizePolicy* size_policy = heap->size_policy();
if (ZapUnusedHeapArea) {
// Save information needed to minimize mangling
heap->record_gen_tops_before_GC();
}
_print_phases = PrintGCDetails && PrintParallelOldGCPhaseTimes;
// Make sure data structures are sane, make the heap parsable, and do other
@ -2127,17 +2136,19 @@ void PSParallelCompact::invoke_no_policy(bool maximum_heap_compaction) {
size_t max_eden_size = young_gen->max_size() -
young_gen->from_space()->capacity_in_bytes() -
young_gen->to_space()->capacity_in_bytes();
size_policy->compute_generation_free_space(young_gen->used_in_bytes(),
young_gen->eden_space()->used_in_bytes(),
old_gen->used_in_bytes(),
perm_gen->used_in_bytes(),
young_gen->eden_space()->capacity_in_bytes(),
old_gen->max_gen_size(),
max_eden_size,
true /* full gc*/,
gc_cause);
size_policy->compute_generation_free_space(
young_gen->used_in_bytes(),
young_gen->eden_space()->used_in_bytes(),
old_gen->used_in_bytes(),
perm_gen->used_in_bytes(),
young_gen->eden_space()->capacity_in_bytes(),
old_gen->max_gen_size(),
max_eden_size,
true /* full gc*/,
gc_cause);
heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes());
heap->resize_old_gen(
size_policy->calculated_old_free_size_in_bytes());
// Don't resize the young generation at an major collection. A
// desired young generation size may have been calculated but
@ -2210,6 +2221,11 @@ void PSParallelCompact::invoke_no_policy(bool maximum_heap_compaction) {
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());
collection_exit.update();