archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-09-20 19:14:38 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

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

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

21
hotspot/src/share/vm/memory/generation.cpp
View file

@ -32,6 +32,12 @@ Generation::Generation(ReservedSpace rs, size_t initial_size, int level) :
vm_exit_during_initialization("Could not reserve enough space for "
"object heap");
}
// Mangle all of the the initial generation.
if (ZapUnusedHeapArea) {
MemRegion mangle_region((HeapWord*)_virtual_space.low(),
(HeapWord*)_virtual_space.high());
SpaceMangler::mangle_region(mangle_region);
}
_reserved = MemRegion((HeapWord*)_virtual_space.low_boundary(),
(HeapWord*)_virtual_space.high_boundary());
}
@ -505,8 +511,11 @@ bool OneContigSpaceCardGeneration::grow_by(size_t bytes) {
_bts->resize(new_word_size);
// Fix for bug #4668531
MemRegion mangle_region(_the_space->end(), (HeapWord*)_virtual_space.high());
_the_space->mangle_region(mangle_region);
if (ZapUnusedHeapArea) {
MemRegion mangle_region(_the_space->end(),
(HeapWord*)_virtual_space.high());
SpaceMangler::mangle_region(mangle_region);
}
// Expand space -- also expands space's BOT
// (which uses (part of) shared array above)
@ -622,6 +631,14 @@ void OneContigSpaceCardGeneration::gc_epilogue(bool full) {
// update the generation and space performance counters
update_counters();
if (ZapUnusedHeapArea) {
the_space()->check_mangled_unused_area_complete();
}
}
void OneContigSpaceCardGeneration::record_spaces_top() {
assert(ZapUnusedHeapArea, "Not mangling unused space");
the_space()->set_top_for_allocations();
}
void OneContigSpaceCardGeneration::verify(bool allow_dirty) {