[8u] RFR (S): 8147087: Race when reusing PerRegionTable bitmaps may result in dropped remembered set entries

[Bengt Rutisson]

Hi Thomas,

Looks good.

Bengt

On 2016-01-20 15:16, Thomas Schatzl wrote:
> Hi all,
>
>    can I get re-reviews for a backport of the JDK-8147087 change to 8u?
>
> As mentioned in the 9 review-request, I intend to backport this change
> to earlier versions as usual, waiting for a successful nightly at
> least.
>
> However yesterday we decided internally that 9/hs-rt should not be
> pushed into to help current stabilization efforts. But it would be nice
> to have the change in 8u by tomorrow due to rdp2. So I would like to
> push to 8u first to meet that, and only later push the jdk9 change as
> reviewed.
>
> I would also need an 8u "R"eviewer to look at this, as Tom and Mikael
> are only Committers at most.
>
> The 8u version requires some changes to the existing code, namely
>
> - path updates
> - merge errors with the copyright date
> - merge errors with the asserts, i.e. instead of
>
> assert(contains_reference(from), " some text ", p2i(from));
>
> 8u requires the use of the err_msg() method in the assert, i.e.
>
> assert(contains_reference(from), err_msg(" some text ", from));
>
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8147087
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8147087/webrev.8u/
> Original 9 review thread:
> http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2016-January/0162
> 44.html
> Testing:
> jprt
>
> Thanks,
>    Thomas
>