[jdk15u-dev] RFR: 8258414: OldObjectSample events too expensive

Mon Jun 7 07:52:35 UTC 2021

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.

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Commit messages:
 - Backport a9b156d358b0436584a33f71abc00c9bed9d47a3

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/70/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=70&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258414
  Stats: 142 lines in 9 files changed: 64 ins; 31 del; 47 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/70.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/70/head:pull/70

PR: https://git.openjdk.java.net/jdk15u-dev/pull/70