[jdk13u-dev] RFR: 8264640: CMS ParScanClosure misses a barrier
akozlov at openjdk.java.net
Fri Apr 2 08:51:46 UTC 2021
Hi, please review an original fix for a GC crash. The jdk13u is the latest supported version that still has buggy code, it was deleted in jdk14 as a part of JEP 363: Remove the Concurrent Mark Sweep (CMS) Garbage Collector. So I'm proposing it here.
The fix is low-risk, on x86-64 it just introduces a compiler barrier to prevent two reads to be reordered as intended by surrounding comments. On CPUs with weaker memory models it introduces CPU barriers as well.
- Add missing barriers
Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/165/head:pull/165
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