RFR(XL): 8167108 - SMR and JavaThread Lifecycle

Daniel D. Daugherty daniel.daugherty at oracle.com
Wed Nov 8 23:09:41 UTC 2017


The jdk10-05-full bits have passed JPRT testing (hs-tier1 testing) and
hs-tier[2-5] testing via Mach 5. No unexpected test failures.

Dan



On 11/8/17 1:05 PM, Daniel D. Daugherty wrote:
> Greetings,
>
> Resolving one of the code review comments (from both Stefan K and Coleen)
> on jdk10-04-full required quite a few changes so it is being done as a
> standalone patch and corresponding webrevs:
>
> Here's the mq comment for the change:
>
>   stefank, coleenp CR - refactor most JavaThreadIterator usage to use
>     JavaThreadIteratorWithHandle.
>
> Here is the full webrev:
>
> http://cr.openjdk.java.net/~dcubed/8167108-webrev/jdk10-05-full/
>
> And here is the delta webrev:
>
> http://cr.openjdk.java.net/~dcubed/8167108-webrev/jdk10-05-delta/
>
> We welcome comments, suggestions and feedback.
>
> Dan, Erik and Robbin
>
>
> On 10/9/17 3:41 PM, Daniel D. Daugherty wrote:
>> Greetings,
>>
>> We have a (eXtra Large) fix for the following bug:
>>
>> 8167108 inconsistent handling of SR_lock can lead to crashes
>> https://bugs.openjdk.java.net/browse/JDK-8167108
>>
>> This fix adds a Safe Memory Reclamation (SMR) mechanism based on
>> Hazard Pointers to manage JavaThread lifecycle.
>>
>> Here's a PDF for the internal wiki that we've been using to describe
>> and track the work on this project:
>>
>> http://cr.openjdk.java.net/~dcubed/8167108-webrev/SMR_and_JavaThread_Lifecycle-JDK10-04.pdf 
>>
>>
>> Dan has noticed that the indenting is wrong in some of the code quotes
>> in the PDF that are not present in the internal wiki. We don't have a
>> solution for that problem yet.
>>
>> Here's the webrev for current JDK10 version of this fix:
>>
>> http://cr.openjdk.java.net/~dcubed/8167108-webrev/jdk10-04-full
>>
>> This fix has been run through many rounds of JPRT and Mach5 tier[2-5]
>> testing, additional stress testing on Dan's Solaris X64 server, and
>> additional testing on Erik and Robbin's machines.
>>
>> We welcome comments, suggestions and feedback.
>>
>> Daniel Daugherty
>> Erik Osterlund
>> Robbin Ehn
>>
>
>



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