aarch64: Concurrent class unloading, nmethod barriers, ZGC

[Andrew Haley]

On 1/9/20 10:35 PM, Erik Österlund wrote:
> Now in this scenario, without an nmethod entry barrier, we can end up 
> calling a dead method. The nmethod entry barrier guards that by 
> enforcing the invariant that we can't enter dead nmethods.

Wow.  :-)

Thank you for that. it's useful to have some discussion of this
permanently recorded online for posterity,

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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