RFR: JDK-8327059: os::Linux::print_proc_sys_info add swappiness information

Thu Feb 29 15:50:00 UTC 2024

The swappiness information is an important reclaim ration metrics on Linux. See https://documentation.suse.com/sles/15-SP2/html/SLES-all/cha-tuning-memory.html#cha-tuning-memory-vm .
We should add it to the already existing information about data from /proc/sys .

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Commit messages:
 - JDK-8327059

Changes: https://git.openjdk.org/jdk/pull/18068/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18068&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327059
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18068.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18068/head:pull/18068

PR: https://git.openjdk.org/jdk/pull/18068