RFR: 8242240: JfrStacktrace_lock rank not special enough

[Erik Österlund]

Hi Markus,

Thanks for the review.

/Erik

On 2020-06-08 13:57, Markus Gronlund wrote:
> Hi Erik,
>
> Looks good, thank you for taking this one.
>
> Thanks
> Markus
>
> -----Original Message-----
> From: Erik Österlund
> Sent: den 8 juni 2020 09:21
> To: Hotspot dev runtime <hotspot-runtime-dev at openjdk.java.net>
> Cc: Markus Gronlund <markus.gronlund at oracle.com>; Erik Gahlin <erik.gahlin at oracle.com>
> Subject: RFR: 8242240: JfrStacktrace_lock rank not special enough
>
> Hi,
>
> After a ZGC event was added, we sometimes acquire the JfrStacktrace_lock (special rank) when the CodeCache_lock (special rank) is held. This leads to an assertion error. My proposed solution is to make the JfrStacktrace_lock even more special (special - 1).
> Special locks are the new normal.
>
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8242240
>
> Webrev:
> http://cr.openjdk.java.net/~eosterlund/8242240/webrev.00/
>
> Thanks,
> /Erik