RFR (S): 8033380: Experimental VM flag to enforce access atomicity (original) (raw)

Aleksey Shipilev aleksey.shipilev at oracle.com
Tue Feb 11 03:02:06 PST 2014

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Hi,

I understand we are still closed for integration?

Please review this small feature meanwhile: https://bugs.openjdk.java.net/browse/JDK-8033380 http://cr.openjdk.java.net/~shade/8033380/webrev.02/

TL;DR: JMM 9 may need to extend the access atomicity over longs and doubles. Luckily, our logic in emitting the relevant access-atomic instructions is decoupled from memory barriers logic, and so we can "just" unconditionally go through needs_atomic_access where appropriate.

Testing:

• full cycle JPRT
• targeted microbenchmarks on x86/ARM/PPC

Thanks, -Aleksey

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