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6692899: CMS: many vm.parallel_class_loading tests fail with assert "missing Printezis mark"

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The CMS concurrent precleaning and concurrent marking phases should work around classes that are undergoing redefinition.

Reviewed-by: ysr, dcubed
This commit is contained in:
Jon Masamitsu 2009-01-11 16:58:24 -08:00
parent 3474623106
commit c2ff9781c7
18 changed files with 161 additions and 19 deletions
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10
hotspot/src/share/vm/memory/space.cpp
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@ -569,7 +569,15 @@ void Space::object_iterate_mem(MemRegion mr, UpwardsObjectClosure* cl) {
if (prev > mr.start()) {
region_start_addr = prev;
blk_start_addr = prev;
assert(blk_start_addr == block_start(region_start_addr), "invariant");
// The previous invocation may have pushed "prev" beyond the
// last allocated block yet there may be still be blocks
// in this region due to a particular coalescing policy.
// Relax the assertion so that the case where the unallocated
// block is maintained and "prev" is beyond the unallocated
// block does not cause the assertion to fire.
assert((BlockOffsetArrayUseUnallocatedBlock &&
(!is_in(prev))) ||
(blk_start_addr == block_start(region_start_addr)), "invariant");
} else {
region_start_addr = mr.start();
blk_start_addr = block_start(region_start_addr);