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7192128: G1: Extend fix for 6948537 to G1's BOT

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G1 does not appear to be immune to the issue described in CR 6948537 and increasing the size of old-generation PLABs appears to increase the liklihood of seeing the issue. Extend the fix for 6948537 to G1's BlockOffsetTable.

Reviewed-by: brutisso, jmasa
This commit is contained in:
John Cuthbertson 2012-08-21 10:05:57 -07:00
parent b11a680280
commit 384650cb3e
3 changed files with 32 additions and 8 deletions
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8
hotspot/src/cpu/sparc/vm/vm_version_sparc.cpp
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@ -106,10 +106,10 @@ void VM_Version::initialize() {
if (FLAG_IS_DEFAULT(OptoLoopAlignment)) {
FLAG_SET_DEFAULT(OptoLoopAlignment, 4);
}
// When using CMS, we cannot use memset() in BOT updates because
// the sun4v/CMT version in libc_psr uses BIS which exposes
// "phantom zeros" to concurrent readers. See 6948537.
if (FLAG_IS_DEFAULT(UseMemSetInBOT) && UseConcMarkSweepGC) {
// When using CMS or G1, we cannot use memset() in BOT updates
// because the sun4v/CMT version in libc_psr uses BIS which
// exposes "phantom zeros" to concurrent readers. See 6948537.
if (FLAG_IS_DEFAULT(UseMemSetInBOT) && (UseConcMarkSweepGC || UseG1GC)) {
FLAG_SET_DEFAULT(UseMemSetInBOT, false);
}
#ifdef _LP64