[jdk17u-dev] Integrated: 8271118: C2: StressGCM should have higher priority than frequency-based policy

[Aleksey Shipilev]

On Mon, 11 Dec 2023 15:15:47 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Clean backport to greatly extend the scope of `StressGCM`. This would allow better compiler testing, including test backports (which rely on `StressGCM` with given seed to reproduce sometimes), and jcstress runs (which automatically opts in to `StressGCM`).
> 
> There seem to be a bunch of compiler bugfixes found/triggered by wider scope, recorded as related issues in duplicate [JDK-8257146](https://bugs.openjdk.org/browse/JDK-8257146), all of which are resolved in current 17u.
> 
> I inspected the code again, and it looks that patch does not change anything else functionally, only takes `StressGCM` path before frequency policy.
> 
> Additional testing:
>  - [x] macos-aarch64-server-fastdebug, `hotspot:tier1`
>  - [x] linux-aarch64-server-fastdebug, `tier{1,2,3}` with `-XX:+StressGCM`
>  - [x] linux-x86_64-server-fastdebug, `tier{1,2,3}` with `-XX:+StressGCM`

This pull request has now been integrated.

Changeset: 95966563
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.org/jdk17u-dev/commit/959665633eae0923d8acce533834940d1797bffd
Stats:     52 lines in 2 files changed: 38 ins; 10 del; 4 mod

8271118: C2: StressGCM should have higher priority than frequency-based policy

Backport-of: ed1cb24027f48ec8e243c26e1847561fa902d91f

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PR: https://git.openjdk.org/jdk17u-dev/pull/2038