Integrated: 8280454: G1: ClassLoaderData verification keeps CLDs live that causes problems with VerifyDuringGC during Remark
Thomas Schatzl
tschatzl at openjdk.java.net
Fri Jun 10 08:00:27 UTC 2022
On Mon, 30 May 2022 17:09:35 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:
> Hi all,
>
> can I have reviews for this change that makes a few CLDG iterations no-keepalive during GC pauses?
>
> This fixes a bug where the `VerifyDuringGC` verification otherwise kept alive all classes, effectively disabling class unloading during (g1) concurrent mark.
>
> Afaict this verification code is only every called during GC pauses, so the change should be fine.
>
> As for the change itself, I tried to avoid cluttering the code with `ClassLoaderDataGraphIterator<>` by using typedefs - unfortunately only C++ 17 allows omitting the `<>` if all template parameters are defaulted.
>
> There is also a new test case for just this.
>
> Testing: tier1-5
>
> Thanks,
> Thomas
This pull request has now been integrated.
Changeset: 94b473e4
Author: Thomas Schatzl <tschatzl at openjdk.org>
URL: https://git.openjdk.org/jdk/commit/94b473e4642a5a4626faeb73341b4aea128ccb31
Stats: 140 lines in 6 files changed: 123 ins; 5 del; 12 mod
8280454: G1: ClassLoaderData verification keeps CLDs live that causes problems with VerifyDuringGC during Remark
Reviewed-by: stefank, coleenp
-------------
PR: https://git.openjdk.org/jdk/pull/8949
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