Integrated: 8338856: [BACKOUT] JDK-8337828: CDS: Trim down minimum GC region alignment

[Aleksey Shipilev]

On Thu, 22 Aug 2024 17:28:56 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> This reverts commit 598169756c903bb1f77e35ea32717043bc166e3c.
> 
> Causes failures in deeper testing, see [JDK-8338753](https://bugs.openjdk.org/browse/JDK-8338753). I missed it, because my testing did not run with `-XX:-UseCompressedOops`. The test with many classes fails readily with this flag:
> 
> 
> $ CONF=linux-x86_64-server-fastdebug make test TEST=runtime/cds/appcds/LotsOfClasses.java TEST_VM_OPTS=-XX:-UseCompressedOops
> 
> java.lang.RuntimeException: Hotspot crashed
> at jdk.test.lib.cds.CDSTestUtils.executeAndLog(CDSTestUtils.java:699)
> at jdk.test.lib.cds.CDSTestUtils.executeAndLog(CDSTestUtils.java:675)
> at jdk.test.lib.cds.CDSTestUtils.createArchive(CDSTestUtils.java:270)
> at jdk.test.lib.cds.CDSTestUtils.createArchiveAndCheck(CDSTestUtils.java:306)
> at LotsOfClasses.main(LotsOfClasses.java:56)
> at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
> at java.base/java.lang.reflect.Method.invoke(Method.java:573)
> at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:333)
> at java.base/java.lang.Thread.run(Thread.java:1575)
> 
> 
> This is really a VM bug that we crash and not exit nicely, but with the old value we are "lucky" these many classes still fit into 1M array. Backout to return to that point would do for now.
> 
> Additional testing:
>  - [x] Linux x86_64 server fastdebug, `runtime/cds`
>  - [x] Linux x86_64 server fastdebug, `runtime/cds` with `-XX:-UseCompressedOops`

This pull request has now been integrated.

Changeset: 813546f9
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/813546f9236d278c380888f1f90cd49b23792d92
Stats:     5 lines in 1 file changed: 1 ins; 0 del; 4 mod

8338856: [BACKOUT] JDK-8337828: CDS: Trim down minimum GC region alignment

Reviewed-by: dcubed

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PR: https://git.openjdk.org/jdk/pull/20681