JDK-7146354 : Re-enable Compressed OOPs after 7118647 is resolved
  • Type: Bug
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: hs23
  • Priority: P3
  • Status: Closed
  • Resolution: Fixed
  • OS: generic,os_x
  • CPU: generic,x86
  • Submitted: 2012-02-16
  • Updated: 2012-10-01
  • Resolved: 2012-03-24
The Version table provides details related to the release that this issue/RFE will be addressed.

Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.

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JDK 7 JDK 8 Other
7u4Fixed 8Fixed hs23Fixed
Related Reports
Duplicate :  
JDK-7118647 - compressed oops crashes on MacOS X with JPRT GCBasher test
Duplicate :  
JDK-7142181 - MacOS: assert: noaccess_prefix should be used only with non zero based compressed oops
Description
After 7118647 is resolved, apply the fix and re-enable Compressed OOPs.
Comments
EVALUATION http://hg.openjdk.java.net/lambda/lambda/hotspot/rev/7df3125953cb
22-03-2012
EVALUATION http://hg.openjdk.java.net/hsx/hotspot-gc/hotspot/rev/7df3125953cb
18-02-2012
EVALUATION http://hg.openjdk.java.net/hsx/hotspot-comp/hotspot/rev/7df3125953cb
18-02-2012
EVALUATION http://hg.openjdk.java.net/hsx/hotspot-main/hotspot/rev/7df3125953cb
17-02-2012
SUGGESTED FIX diff --git a/src/share/vm/runtime/virtualspace.cpp b/src/share/vm/runtime/virtualspace.cpp --- a/src/share/vm/runtime/virtualspace.cpp +++ b/src/share/vm/runtime/virtualspace.cpp @@ -455,7 +455,7 @@ void ReservedSpace::protect_noaccess_prefix(const size_t size) { assert( (_noaccess_prefix != 0) == (UseCompressedOops && _base != NULL && - (size_t(_base + _size) > OopEncodingHeapMax) && + (Universe::narrow_oop_base() != NULL) && Universe::narrow_oop_use_implicit_null_checks()), "noaccess_prefix should be used only with non zero based compressed oops"); diff --git a/src/share/vm/runtime/arguments.cpp b/src/share/vm/runtime/arguments.cpp --- a/src/share/vm/runtime/arguments.cpp +++ b/src/share/vm/runtime/arguments.cpp @@ -1370,12 +1370,9 @@ // by ergonomics. if (MaxHeapSize <= max_heap_for_compressed_oops()) { #if !defined(COMPILER1) || defined(TIERED) -// disable UseCompressedOops by default on MacOS X until 7118647 is fixed -#ifndef __APPLE__ if (FLAG_IS_DEFAULT(UseCompressedOops)) { FLAG_SET_ERGO(bool, UseCompressedOops, true); } -#endif // !__APPLE__ #endif #ifdef _WIN64 if (UseLargePages && UseCompressedOops) {
17-02-2012
EVALUATION http://hg.openjdk.java.net/hsx/hotspot-rt/hotspot/rev/7df3125953cb
17-02-2012
EVALUATION Relax the assertion to simply check for COOP mode rather than an exact address.
16-02-2012