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diff src/share/vm/runtime/globals.hpp @ 1716:be3f9c242c9d

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6948538: CMS: BOT walkers can fall into object allocation and initialization cracks Summary: GC workers now recognize an intermediate transient state of blocks which are allocated but have not yet completed initialization. blk_start() calls do not attempt to determine the size of a block in the transient state, rather waiting for the block to become initialized so that it is safe to query its size. Audited and ensured the order of initialization of object fields (klass, free bit and size) to respect block state transition protocol. Also included some new assertion checking code enabled in debug mode. Reviewed-by: chrisphi, johnc, poonam
author ysr
date Mon, 16 Aug 2010 15:58:42 -0700
parents 7fcd5f39bd7a
children b4099f5786da
line wrap: on
line diff
--- a/src/share/vm/runtime/globals.hpp	Sat Aug 14 00:47:52 2010 -0700
+++ b/src/share/vm/runtime/globals.hpp	Mon Aug 16 15:58:42 2010 -0700
@@ -1712,7 +1712,7 @@
   develop(bool, VerifyBlockOffsetArray, false,                              \
           "Do (expensive!) block offset array verification")                \
                                                                             \
-  product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug,           \
+  product(bool, BlockOffsetArrayUseUnallocatedBlock, false,                 \
           "Maintain _unallocated_block in BlockOffsetArray"                 \
           " (currently applicable only to CMS collector)")                  \
                                                                             \