RFR: 8333522: JFR SwapSpace event might read wrong free swap space size [v4]

[Matthias Baesken]

> In some cgroups v2 based test system , a too large free swap space value has been observed.
> The value should not be larger than total swap space.

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  add comment suggested by Severin

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19574/files
  - new: https://git.openjdk.org/jdk/pull/19574/files/de08dc06..2df9dadf

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19574&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19574&range=02-03

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19574.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19574/head:pull/19574

PR: https://git.openjdk.org/jdk/pull/19574