RFR: 8256155: 2M large pages for code when LargePageSizeInBytes is set to 1G for heap [v3]

[Marcus G K Williams]

> Add 2M LargePages to _page_sizes
> 
>     Use 2m pages for large page requests
>     less than 1g on linux when 1G are default
>     pages
> 
>     - Add os::Linux::large_page_size_2m() that
>     returns 2m as size
>     - Add os::Linux::select_large_page_size() to return
>     correct large page size for size_t bytes
>     - Add 2m size to _page_sizes array
>     - Update reserve_memory_special methods
>     to set/use large_page_size based on bytes reserved
>     - Update large page not reserved warnings
>     to include large_page_size attempted
>     - Update TestLargePageUseForAuxMemory.java
>     to expect 2m large pages in some instances
> 
> Signed-off-by: Marcus G K Williams <marcus.williams at intel.com>

Marcus G K Williams has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - Merge branch 'update_hlp' of github.com:mgkwill/jdk into update_hlp
 - Add 2M LargePages to _page_sizes
   
   Use 2m pages for large page requests
   less than 1g on linux when 1G are default
   pages
   
   - Add os::Linux::large_page_size_2m() that
   returns 2m as size
   - Add os::Linux::select_large_page_size() to return
   correct large page size for size_t bytes
   - Add 2m size to _page_sizes array
   - Update reserve_memory_special methods
   to set/use large_page_size based on bytes reserved
   - Update large page not reserved warnings
   to include large_page_size attempted
   - Update TestLargePageUseForAuxMemory.java
   to expect 2m large pages in some instances
   
   Signed-off-by: Marcus G K Williams <marcus.williams at intel.com>
 - Merge remote-tracking branch 'upstream/master' into update_hlp
 - Add 2M LargePages to _page_sizes
   
   Use 2m pages for large page requests
   less than 1g on linux when 1G are default
   pages
   
   - Add os::Linux::large_page_size_2m() that
   returns 2m as size
   - Add os::Linux::select_large_page_size() to return
   correct large page size for size_t bytes
   - Add 2m size to _page_sizes array
   - Update reserve_memory_special methods
   to set/use large_page_size based on bytes reserved
   - Update large page not reserved warnings
   to include large_page_size attempted
   - Update TestLargePageUseForAuxMemory.java
   to expect 2m large pages in some instances
   
   Signed-off-by: Marcus G K Williams <marcus.williams at intel.com>

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1153/files
  - new: https://git.openjdk.java.net/jdk/pull/1153/files/7092bec8..57e54963

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1153&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1153&range=01-02

  Stats: 204961 lines in 1352 files changed: 133754 ins; 50869 del; 20338 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