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6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads

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Select number of GC threads dynamically based on heap usage and number of Java threads

Reviewed-by: johnc, ysr, jcoomes
This commit is contained in:
Jon Masamitsu 2011-08-09 10:16:01 -07:00
parent 098ed89645
commit 15070123fa
39 changed files with 1523 additions and 231 deletions
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6
hotspot/src/share/vm/memory/cardTableRS.cpp
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@ -164,7 +164,13 @@ inline bool ClearNoncleanCardWrapper::clear_card_serial(jbyte* entry) {
ClearNoncleanCardWrapper::ClearNoncleanCardWrapper(
DirtyCardToOopClosure* dirty_card_closure, CardTableRS* ct) :
_dirty_card_closure(dirty_card_closure), _ct(ct) {
// Cannot yet substitute active_workers for n_par_threads
// in the case where parallelism is being turned off by
// setting n_par_threads to 0.
_is_par = (SharedHeap::heap()->n_par_threads() > 0);
assert(!_is_par ||
(SharedHeap::heap()->n_par_threads() ==
SharedHeap::heap()->workers()->active_workers()), "Mismatch");
}
void ClearNoncleanCardWrapper::do_MemRegion(MemRegion mr) {