RFR: 8263236: runtime/os/TestTracePageSizes.java fails on old kernels [v5]

[Aleksey Shipilev]

> See the bug report for details. On some kernels, the madvise hint is not reflected in `/proc/smaps`.
> Rough kernel bisection shows that the hints are reliable since kernel 4.15.
> 
> Additional testing:
>  - [x] Test with kernel 5.4.0 (still passes)
>  - [x] Test with kernel 4.9.0 (used to fail, now passes)
>  - [x] Test with kernel 4.15 (still passes)
>  - [x] Test with kernel 4.14.17 (used to fail, now passes)

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  More precise version, after rough kernel bisection

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3415/files
  - new: https://git.openjdk.java.net/jdk/pull/3415/files/5bf7827c..1df37de7

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3415&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3415&range=03-04

  Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3415.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3415/head:pull/3415

PR: https://git.openjdk.java.net/jdk/pull/3415