8258414: OldObjectSample events too expensive

[kvergizova]

I'd like to backport JDK-8258414 to 15u for parity with 11u.
The patch applies almost cleanly except for some copyright years differences and context changes in jfrAllocationTracer.hpp/jfrAllocationTracer.cpp (JDK-8258094 and JDK-8258404 are not in 15u), reapplied manually.
Tested with tier1 and jdk/jfr tests.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JDK-8258414: OldObjectSample events too expensive

Reviewers

• Yuri Nesterenko (@yan-too - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk15u-dev pull/70/head:pull/70
$ git checkout pull/70

Update a local copy of the PR:
$ git checkout pull/70
$ git pull https://git.openjdk.java.net/jdk15u-dev pull/70/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 70

View PR using the GUI difftool:
$ git pr show -t 70

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk15u-dev/pull/70.diff

[bridgekeeper]

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[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (0d2baec2)

[openjdk]

@kvergizova This change now passes all automated pre-integration checks.

After integration, the commit message for the final commit will be:

8258414: OldObjectSample events too expensive

Reviewed-by: yan

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

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[kvergizova]

/integrate

[openjdk]

@kvergizova Pushed as commit 90b6d69.

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