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src/share/vm/runtime/commandLineFlagConstraintsGC.cpp
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*** 380,389 ****
--- 380,422 ----
}
#endif
return Flag::SUCCESS;
}
+ Flag::Error ParGCCardsPerStrideChunkConstraintFunc(intx value, bool verbose) {
+ #if INCLUDE_ALL_GCS
+ if (UseConcMarkSweepGC) {
+ // ParGCCardsPerStrideChunk shoule be compared with card table size.
+ size_t heap_size = Universe::heap()->reserved_region().word_size();
+ CardTableModRefBS* bs = (CardTableModRefBS*)GenCollectedHeap::heap()->rem_set()->bs();
+ size_t card_table_size = bs->cards_required(heap_size) - 1; // Valid card table size
+
+ if ((size_t)value > card_table_size) {
+ CommandLineError::print(verbose,
+ "ParGCCardsPerStrideChunk (" INTX_FORMAT ") is too large for the heap size and "
+ "must be less than or equal to card table size (" SIZE_FORMAT ")\n",
+ value, card_table_size);
+ return Flag::VIOLATES_CONSTRAINT;
+ }
+
+ // ParGCCardsPerStrideChunk is used with n_strides(ParallelGCThreads*ParGCStridesPerThread)
+ // from CardTableModRefBSForCTRS::process_stride(). However, ParGCStridesPerThread is already checked
+ // not to make an overflow with ParallelGCThreads from its constraint function.
+ uintx n_strides = ParallelGCThreads * ParGCStridesPerThread;
+ uintx ergo_max = max_uintx / n_strides;
+ if ((uintx)value > ergo_max) {
+ CommandLineError::print(verbose,
+ "ParGCCardsPerStrideChunk (" INTX_FORMAT ") must be "
+ "less than or equal to ergonomic maximum (" UINTX_FORMAT ")\n",
+ value, ergo_max);
+ return Flag::VIOLATES_CONSTRAINT;
+ }
+ }
+ #endif
+ return Flag::SUCCESS;
+ }
+
Flag::Error CMSOldPLABMinConstraintFunc(size_t value, bool verbose) {
Flag::Error status = Flag::SUCCESS;
#if INCLUDE_ALL_GCS
if (UseConcMarkSweepGC) {
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