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Enforce +UseCompressedClassPointers #5

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@rkennke rkennke commented May 17, 2021

This change force-enables +UseCompressedClassPointers. This is required for the next step where we want to store the compressed class pointers into object headers. The change also removes test configurations that explicitely disable CCP.
In the long run, we would remove the flag altogether, but not now.


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@bridgekeeper bridgekeeper bot commented May 17, 2021

👋 Welcome back rkennke! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

@openjdk openjdk bot added the rfr label May 17, 2021
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@mlbridge mlbridge bot commented May 17, 2021


src/hotspot/share/runtime/arguments.cpp Outdated Show resolved Hide resolved
test/hotspot/jtreg/gc/metaspace/ Outdated Show resolved Hide resolved
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@openjdk openjdk bot commented May 17, 2021

@rkennke This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file for details.

After integration, the commit message for the final commit will be:

Enforce +UseCompressedClassPointers

Reviewed-by: shade

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@openjdk openjdk bot added the ready label May 17, 2021
rkennke and others added 2 commits May 17, 2021
Co-authored-by: Aleksey Shipilëv <>
Co-authored-by: Aleksey Shipilëv <>
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@rkennke rkennke commented May 18, 2021


@openjdk openjdk bot closed this May 18, 2021
@openjdk openjdk bot added integrated and removed ready rfr labels May 18, 2021
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@openjdk openjdk bot commented May 18, 2021

@rkennke Pushed as commit c6e863a.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.

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@mlbridge mlbridge bot commented May 18, 2021

Mailing list message from Thomas Stüfe on lilliput-dev:

I like this. This may be something for the mainline JDK too, independent
from Lilliput. Since CompressedClassPointers have been made independent
from CompressedOops, I don't see a reason to run
without CompressedClassPointers on 64bit. This would slash test effort and
remove unknowns (e.g. differences in heap usage when CCptrs are off).

Cheers, Thomas

On Mon, May 17, 2021 at 5:47 PM Roman Kennke <rkennke at>

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