truffle: src/share/vm/gc_interface/collectedHeap.cpp comparison

8030177: G1: Enable TLAB resizing Reviewed-by: tschatzl, stefank, jmasa

comparison

equal deleted inserted replaced

-:085b304a1cc5
+:cfd4aac53239
 bs->write_region(deferred);
 // "Clear" the deferred_card_mark field
 thread->set_deferred_card_mark(MemRegion());
 }
 assert(thread->deferred_card_mark().is_empty(), "invariant");
+}
+size_t CollectedHeap::max_tlab_size() const {
+// TLABs can't be bigger than we can fill with a int[Integer.MAX_VALUE].
+// This restriction could be removed by enabling filling with multiple arrays.
+// If we compute that the reasonable way as
+//    header_size + ((sizeof(jint) * max_jint) / HeapWordSize)
+// we'll overflow on the multiply, so we do the divide first.
+// We actually lose a little by dividing first,
+// but that just makes the TLAB  somewhat smaller than the biggest array,
+// which is fine, since we'll be able to fill that.
+size_t max_int_size = typeArrayOopDesc::header_size(T_INT) +
+sizeof(jint) *
+((juint) max_jint / (size_t) HeapWordSize);
+return align_size_down(max_int_size, MinObjAlignment);
 }
 // Helper for ReduceInitialCardMarks. For performance,
 // compiled code may elide card-marks for initializing stores
 // to a newly allocated object along the fast-path. We

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