[13] RFR(L): 8214542: JFR: Old Object Sample event slow on a deep heap in debug builds

[Erik Gahlin]

Looks good.

Erik

> On 28 Jun 2019, at 17:56, Markus Gronlund <markus.gronlund at oracle.com> wrote:
> 
> Greetings, 
> 
> Kindly asking for reviews for the following changeset:
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8214542 
> Webrev: http://cr.openjdk.java.net/~mgronlun/8214542/webrev01/ 
> Testing: test/jdk/:jdk_jfr
> 
> Summary:
> Removal of heavy current_frontier assertion.
> Trimmed down storage requirements by only storing necessary contextual edges.
> Normalized representation of edges for better reuse.
> Better preservation of already persisted tree structure by less intrusive reuse logic.
> Caching.
> 
> Thank you in advance
> Markus