RFR (M): 8233919: Incrementally calculate the occupied cards in a heap region remembered set
thomas.schatzl at oracle.com
Fri Nov 22 12:59:32 UTC 2019
ping for a second review :P
On 12.11.19 16:24, Thomas Schatzl wrote:
> Hi all,
> may I have reviews for this change that ultimately makes sure that
> the number of occupied cards in a remembered set is only growing by
> providing a per-OtherRegionsTable count that is atomically updated when
> adding a remembered set entry.
> Note that this count may not be completely accurate due to races when
> deleting a PerRegionTable (which is a known issue) from an
> OtherRegionsTable; but that is no different than before.
> This helps improving the predictions in the young gen remset sampling
> thread, and increase the performance of getting the occupancy count.
> Based on JDK-8233997, and JDK-8233998 also out for review.
More information about the hotspot-gc-dev