RFR: JDK-8256155: os::Linux Populate all large_page_sizes, select smallest page size in reserve_memory_special_huge_tlbfs* [v5]

[Marcus G K Williams]

> When using LargePageSizeInBytes=1G, os::Linux::reserve_memory_special_huge_tlbfs* cannot select large pages smaller than 1G. Code heap usually uses less than 1G, so currently the code precludes code heap from using
> Large pages in this circumstance and when os::Linux::reserve_memory_special_huge_tlbfs* is called page sizes fall back to Linux::page_size() (usually 4k).
> 
> This change allows the above use case by populating all large_page_sizes present in /sys/kernel/mm/hugepages in _page_sizes upon calling os::Linux::setup_large_page_size().
> 
> In os::Linux::reserve_memory_special_huge_tlbfs* we then select the largest large page size available in _page_sizes that is smaller than bytes being reserved.

Marcus G K Williams has updated the pull request incrementally with one additional commit since the last revision:

  Remove remnant UseSHM change
  
  Signed-off-by: Marcus G K Williams <marcus.williams at intel.com>

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1153/files
  - new: https://git.openjdk.java.net/jdk/pull/1153/files/0901e70e..b5bd144d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1153&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1153&range=03-04

  Stats: 13 lines in 1 file changed: 0 ins; 10 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1153.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1153/head:pull/1153

PR: https://git.openjdk.java.net/jdk/pull/1153