Mercurial > hg > graal-compiler
diff src/share/vm/gc_implementation/parNew/parCardTableModRefBS.cpp @ 4095:bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
Summary: Select number of GC threads dynamically based on heap usage and number of Java threads
Reviewed-by: johnc, ysr, jcoomes
| author | jmasa |
|---|---|
| date | Tue, 09 Aug 2011 10:16:01 -0700 |
| parents | 3be7439273c5 |
| children | 04b9a2566eec 441e946dc1af |
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--- a/src/share/vm/gc_implementation/parNew/parCardTableModRefBS.cpp Tue Nov 22 04:47:10 2011 -0500 +++ b/src/share/vm/gc_implementation/parNew/parCardTableModRefBS.cpp Tue Aug 09 10:16:01 2011 -0700 @@ -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 @@ 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 @@ 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);