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6724367: par compact could clear less young gen summary data

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Reviewed-by: jmasa, apetrusenko
This commit is contained in:
John Coomes 2008-07-11 16:11:50 -07:00
parent 038a30dde3
commit 26625ab7f5
1 changed files with 8 additions and 6 deletions
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14
hotspot/src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp
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@ -1639,7 +1639,7 @@ void PSParallelCompact::summary_phase(ParCompactionManager* cm,
const size_t live = pointer_delta(_space_info[id].new_top(),
space->bottom());
const size_t available = pointer_delta(target_space_end, *new_top_addr);
if (live <= available) {
if (live > 0 && live <= available) {
// All the live data will fit.
if (TraceParallelOldGCSummaryPhase) {
tty->print_cr("summarizing %d into old_space @ " PTR_FORMAT,
@ -1649,16 +1649,18 @@ void PSParallelCompact::summary_phase(ParCompactionManager* cm,
space->bottom(), space->top(),
new_top_addr);
// Reset the new_top value for the space.
_space_info[id].set_new_top(space->bottom());
// Clear the source_chunk field for each chunk in the space.
HeapWord* const new_top = _space_info[id].new_top();
HeapWord* const clear_end = _summary_data.chunk_align_up(new_top);
ChunkData* beg_chunk = _summary_data.addr_to_chunk_ptr(space->bottom());
ChunkData* end_chunk = _summary_data.addr_to_chunk_ptr(space->top() - 1);
while (beg_chunk <= end_chunk) {
ChunkData* end_chunk = _summary_data.addr_to_chunk_ptr(clear_end);
while (beg_chunk < end_chunk) {
beg_chunk->set_source_chunk(0);
++beg_chunk;
}
// Reset the new_top value for the space.
_space_info[id].set_new_top(space->bottom());
}
}