RFR (XS): 8052170: G1 asserts at collection exit with -XX:-G1DeferredRSUpdate

Thomas Schatzl thomas.schatzl at oracle.com
Wed Aug 6 14:15:35 UTC 2014

Hi all,

  Bengt had some suggestions to simplify the change: just skip
verification for the values that we do not print anyway.

As this makes the change a lot simpler, I changed it as suggested. New
webrev is at


On Tue, 2014-08-05 at 16:07 +0200, Thomas Schatzl wrote:
> Hi all,
>   can I have reviews for this small change? It fixes an assertion that
> triggers when -XX:-G1DeferredRSUpdate and -XX:+PrintGCDetails is set. In
> particular in this case the timing measurements introduced in
> JDK-8019342 are not updated during GC, causing this issue.
> The existing test case introduced in 8040977 does not trigger either,
> because it does not enable PrintGCDetails.
> The fix is to initialize these timing metrics also in case
> G1DeferredRSUpdate is disabled.
> I also moved the checking whether G1DeferredRSUpdate is enabled into
> G1CollectedHeap::redirty_logged_cards() as similar code style has been
> suggested for the eager reclaim change.
> I updated the existing test case too.
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8052170
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8052170/webrev
> Testing:
> jprt, jtreg test case
> Thanks,
>   Thomas

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