RFR: 8298175: JFR: Common timestamp for periodic events [v2]

[Erik Gahlin]

> Could I have review of infrastructure that makes it easier to write periodic events with the same timestamp.
> 
> Testing: jdk/jdk/jfr + tier1 + tier2
> 
> Thanks
> Erik

Erik Gahlin has updated the pull request incrementally with one additional commit since the last revision:

  Update request loop

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/11541/files
  - new: https://git.openjdk.org/jdk/pull/11541/files/96146720..605f1290

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11541&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11541&range=00-01

  Stats: 8 lines in 1 file changed: 0 ins; 3 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/11541.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11541/head:pull/11541

PR: https://git.openjdk.org/jdk/pull/11541