RFR: 8256155: Allow multiple large page sizes to be used on Linux [v29]

[Stefan Johansson]

On Mon, 26 Apr 2021 08:33:44 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

>> Marcus G K Williams has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 48 commits:
>> 
>>  - Set LargePageSizeInBytes to largepage upper limit
>>    
>>    Signed-off-by: Marcus G K Williams <marcus.williams at intel.com>
>>  - Merge branch 'master' into update_hlp
>>  - Fix merge
>>    
>>    Signed-off-by: Marcus G K Williams <marcus.williams at intel.com>
>>  - Merge branch 'master' into update_hlp
>>  - Merge branch 'master' into update_hlp
>>  - Rebase on pull/3073
>>    
>>    Signed-off-by: Marcus G K Williams <marcus.williams at intel.com>
>>  - Merge branch 'pull/3073' into update_hlp
>>  - Thomas review.
>>    
>>    Changed commit_memory_special to return bool to signal if the request succeeded or not.
>>  - Self review.
>>    
>>    Update helper name to better match commit_memory_special().
>>  - Marcus review.
>>    
>>    Updated comments.
>>  - ... and 38 more: https://git.openjdk.java.net/jdk/compare/5aab1609...6f063309
>
> src/hotspot/os/linux/os_linux.cpp line 3767:
> 
>> 3765:   } else {
>> 3766:     _large_page_size = default_large_page_size;
>> 3767:   }
> 
> Move this part up to be done before you populate `_page_sizes` with the page sizes from `all_page_sizes`. Then you can use `_large_page_size` as the maximum page size that you add to `_page_sizes` and you don't have to care about `LargePageSizeInBytes` in that for-loop.

I also think that the log-tag should be `pagesize`.

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