RFR: 8254167 G1: Record regions where evacuation failed to provide targeted iteration [v6]
Hamlin Li
mli at openjdk.java.net
Fri Sep 3 03:19:57 UTC 2021
> This is another try to optimize evcuation failure for regions.
> I record evacuation failed regions, and iterate these regions directly rather than iterate the whole cset.
> The implementation reuses and refactors some of the existing data in g1CollectedHeap (_regions_failed_evacuation, _num_regions_failed_evacuation), and records these regions in an array, and iterate this array later in post evacuation phase.
>
> I have 2 implementations:
>
> - 1) CHT (Initial version)
> - 2) bitmap (latest version, reuse _regions_failed_evacuation in g1CollectedHeap)
>
> This implementation does not consider work distribution as mentioned in JDK-8254167 yet. But seems it already get better&stable performance gain than origin. We could improve it further later if work distribution is necessary.
>
> I will attach the perf data in JBS.
Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:
Refactor par iteration for regions of cset and evac failure.
-------------
Changes:
- all: https://git.openjdk.java.net/jdk/pull/5272/files
- new: https://git.openjdk.java.net/jdk/pull/5272/files/7fa8496d..3b5543f5
Webrevs:
- full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5272&range=05
- incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5272&range=04-05
Stats: 98 lines in 5 files changed: 39 ins; 42 del; 17 mod
Patch: https://git.openjdk.java.net/jdk/pull/5272.diff
Fetch: git fetch https://git.openjdk.java.net/jdk pull/5272/head:pull/5272
PR: https://git.openjdk.java.net/jdk/pull/5272
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