RFR: JDK-8199735: Mark word updates need to use Access API

[Roman Kennke]

Am 19.03.2018 um 12:07 schrieb Roman Kennke:
> Am 19.03.2018 um 11:40 schrieb Roman Kennke:
>> Currently, the mark word is accessed directly in oopDesc::mark()
>> set_mark() and a bunch of other accessors. Those need to use the Access
>> API instead because GC might want to employ barriers on those accesses,
>> pretty much like every other field in oopDesc.
>>
>> Notice that this is *not* about accessing the bits and fields inside the
>> markOop, but about accessing the header itself.
>>
>> http://cr.openjdk.java.net/~rkennke/JDK-8199735/webrev.01/
>>
>> Testing: build fastdebug/release with and without PCH, passed tier1
>> fastdebug/release.
>>
>> Can I please get reviews?
>>
>> Thanks, Roman
>>
> 
> Just when I sent it, I realized that this is dropping the volatile from
> the mark word access. Fixed here:
> 
> 
> http://cr.openjdk.java.net/~rkennke/JDK-8199735/webrev.02/
> 

Ping?

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