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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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8
hotspot/src/share/vm/gc_implementation/parNew/parCardTableModRefBS.cpp
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@ -33,6 +33,7 @@
#include "runtime/java.hpp"
#include "runtime/mutexLocker.hpp"
#include "runtime/virtualspace.hpp"
#include "runtime/vmThread.hpp"
void CardTableModRefBS::non_clean_card_iterate_parallel_work(Space* sp, MemRegion mr,
OopsInGenClosure* cl,
@ -42,6 +43,11 @@ void CardTableModRefBS::non_clean_card_iterate_parallel_work(Space* sp, MemRegio
assert((n_threads == 1 && ParallelGCThreads == 0) ||
n_threads <= (int)ParallelGCThreads,
"# worker threads != # requested!");
assert(!Thread::current()->is_VM_thread() || (n_threads == 1), "There is only 1 VM thread");
assert(UseDynamicNumberOfGCThreads ||
!FLAG_IS_DEFAULT(ParallelGCThreads) ||
n_threads == (int)ParallelGCThreads,
"# worker threads != # requested!");
// Make sure the LNC array is valid for the space.
jbyte** lowest_non_clean;
uintptr_t lowest_non_clean_base_chunk_index;
@ -52,6 +58,8 @@ void CardTableModRefBS::non_clean_card_iterate_parallel_work(Space* sp, MemRegio
int n_strides = n_threads * ParGCStridesPerThread;
SequentialSubTasksDone* pst = sp->par_seq_tasks();
// Sets the condition for completion of the subtask (how many threads
// need to finish in order to be done).
pst->set_n_threads(n_threads);
pst->set_n_tasks(n_strides);