RFR: 8305618: Move gcold out of tier1

[Aleksey Shipilev]

On Wed, 5 Apr 2023 02:40:43 GMT, David Holmes <dholmes at openjdk.org> wrote:

> You've removed tier1_gc_gcold from tier1_gc as stated, but shouldn't that group now be renamed as it is no longer part of tier1? And does it need to be added into another tier?

+1. 

Shenandoah runs both gcold and gcbasher in tier3, should we run these in tier3 as well? Otherwise they would get caught by tier4, which is too long for many to run.

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PR Comment: https://git.openjdk.org/jdk/pull/13340#issuecomment-1497119093