RFR: 8183545: Event tracing, transition hooks

[Robbin Ehn]

Thanks Erik!

/Robbin

On 07/06/2017 04:16 PM, Erik Gahlin wrote:
> Looks good.
> 
> Erik
> 
>> Hi all,
>>
>> Please review.
>>
>> This patch adds a new bit in suspend flag for the tracing backend.
>> Thus tracing backend can suspend threads on certain transitions.
>>
>> (David H and Dan D have looked at this, that's why they are on CC)
>>
>> I have also put in a oneliner in:
>> src/share/vm/classfile/javaClasses.cpp
>>
>> Which adds Threads_lock->owned_by_self() to the assert.
>> Threads_lock->owned_by_self() give the same guarantees as is_Watcher_thread(), e.g. there is no safepoint.
>>
>> If you really insist I can put the oneliner in a separate issue, but the tracing backend changes depends on both.
>>
>> Issue: https://bugs.openjdk.java.net/browse/JDK-8183545
>> Webrev: http://cr.openjdk.java.net/~rehn/8183545/webrev/index.html
>>
>> Test: openjdk build on Linux x64
>>
>> Thanks!
>>
>> /Robbin
>