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8155229: Tune thread usage for live data clearing

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Reviewed-by: mgerdin, drwhite
This commit is contained in:
Thomas Schatzl 2016-05-02 10:24:41 +02:00
parent 53d670b469
commit 39d3c3f512
1 changed files with 4 additions and 1 deletions
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5
hotspot/src/share/vm/gc/g1/g1CardLiveData.cpp
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@ -424,9 +424,12 @@ void G1CardLiveData::clear(WorkGang* workers) {
guarantee(Universe::is_fully_initialized(), "Should not call this during initialization.");
size_t const num_chunks = align_size_up(live_cards_bm().size_in_bytes(), G1ClearCardLiveDataTask::chunk_size()) / G1ClearCardLiveDataTask::chunk_size();
uint const num_workers = (uint)MIN2(num_chunks, (size_t)workers->active_workers());
G1ClearCardLiveDataTask cl(live_cards_bm(), num_chunks);
workers->run_task(&cl);
log_debug(gc, ergo)("Running %s using %u workers for " SIZE_FORMAT " work units.", cl.name(), num_workers, num_chunks);
workers->run_task(&cl, num_workers);
// The region live bitmap is always very small, even for huge heaps. Clear
// directly.