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6716785: implicit null checks not triggering with CompressedOops

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Allocate alignment-sized page(s) below java heap so that memory accesses at heap_base+1page give signal and cause an implicit null check

Reviewed-by: kvn, jmasa, phh, jcoomes
This commit is contained in:
Coleen Phillimore 2008-07-19 17:38:22 -04:00
parent 575988272e
commit 20dba03e99
23 changed files with 197 additions and 133 deletions
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4
hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp
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@ -108,8 +108,8 @@ jint ParallelScavengeHeap::initialize() {
// size than is needed or wanted for the perm gen. Use the "compound
// alignment" ReservedSpace ctor to avoid having to use the same page size for
// all gens.
ReservedSpace heap_rs(pg_max_size, pg_align, og_max_size + yg_max_size,
og_align);
ReservedHeapSpace heap_rs(pg_max_size, pg_align, og_max_size + yg_max_size,
og_align);
os::trace_page_sizes("ps perm", pg_min_size, pg_max_size, pg_page_sz,
heap_rs.base(), pg_max_size);
os::trace_page_sizes("ps main", og_min_size + yg_min_size,