RFR: 8223147: JFR Backport (to jdk8u)

[Andrey Petushkov]

Hi Mario,

My understanding is that these changes are to compliment the work/fix the bugs I've done under 8223147 (main backport issue).
These do not have openjdk bug numbers because correspond to changes made by Oracle privately, before JFR was open-sourced.
In other words - the functionality they bring is already part of openjdk jdk11, however expressed in some different code (since otherwise I
would just brought it under 8223147). So it required jdk8-specific way to make it happen in jdk8, which was generously done by Alibaba team

Hope this clarifies
Regards,
Andrey

> On 12 Aug 2019, at 11:50, Mario Torre <neugens at redhat.com> wrote:
> 
> Hi Denghui,
> 
> I'm a bit confused because none of those seems to be a backport bug.
> 
> For example, the 8223689 isn't in 11. As such, we should first port
> changes to the topmost upstream release and than carry them down one
> by one until it reaches 8, in other words we should request the
> changes to go first in 14, then 13, then 11 then 8.
> 
> We can of course apply single fixes in 8 that do not qualify for the
> other releases, for example (I have yet to try) if 8229401 is only
> valid because of the backport to 8 then it's fine to only fix this
> problem in 8, otherwise we need to go the full route.
> 
> Cheers,
> Mario
> 
> Cheers,
> Mario
> 
> 
> On Mon, Aug 12, 2019 at 10:32 AM DDH <denghui.ddh at alibaba-inc.com> wrote:
>> 
>> Hi Mario、Andrey,
>> 
>> We(Alibaba) recently fixed some test failures about JFR CodeCache events, which are incremental changes based on Azul' patchset.
>> 8229401: Fix JFR code cache test failures
>> http://cr.openjdk.java.net/~luchsh/jfr_cr/cr_8229401_hs/
>> http://cr.openjdk.java.net/~luchsh/jfr_cr/cr_8229401_jdk/
>> 
>> 
>> The other patchset we provided earlier is as follows:
>> 8223689: Add JFR Thread Sampling Support
>> http://cr.openjdk.java.net/~luchsh/jfr_cr/cr_thread_samp_20190326/
>> 
>> 8223690: Add JFR BiasedLock Event Support
>> http://cr.openjdk.java.net/~luchsh/hs_biasedlock/
>> http://cr.openjdk.java.net/~luchsh/jdk_biasedlock/
>> 
>> 8223691: Add JFR G1 Region Type Change Event Support
>> http://cr.openjdk.java.net/~luchsh/g1region_type_change_event
>> 
>> 8223692: Add JFR G1 Heap Summary Event Support
>> http://cr.openjdk.java.net/~luchsh/jfr_cr/cr_g1heapsum_hs_20190326/
>> http://cr.openjdk.java.net/~luchsh/jfr_cr/cr_g1heapsum_jdk_20190326/
>> 
>> Thanks,
>> Denghui
> 
> 
> 
> --
> Mario Torre
> Associate Manager, Software Engineering
> Red Hat GmbH <https://www.redhat.com>
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