RFR: 8371420: Still sporadic failures of gc/TestAlwaysPreTouchBehavior.java#<gcname> on Linux after JDK-8359104 [v2]

[Matthias Baesken]

> After [JDK-8359104](https://bugs.openjdk.org/browse/JDK-8359104) where getting RSS was improved, we still see sporadic failures of the test gc/TestAlwaysPreTouchBehavior.java#<gcname> , for different gcs.
> E.g. gc/TestAlwaysPreTouchBehavior.java#Epsilon (with -Xlog:os=debug added for more output) 
> 
> 
> ----------System.err:(13/1278)----------
> java.lang.RuntimeException: RSS of this process(24465408b) should be bigger than or equal to heap size(268435456b) (available memory: 16295006208). On Linux Kernel < 4.14 RSS can be inaccurate: expected 24465408 > 268435456
> 
> 
> Looks like the RSS values we get are somewhat delayed/inaccurate .

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

  Add a comment about RSS values and adjust indentation

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28735/files
  - new: https://git.openjdk.org/jdk/pull/28735/files/9eb19178..5fd2bbad

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28735&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28735&range=00-01

  Stats: 8 lines in 1 file changed: 1 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/28735.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28735/head:pull/28735

PR: https://git.openjdk.org/jdk/pull/28735