RFR: 8271195: Use largest available large page size smaller than LargePageSizeInBytes when available [v6]

[Stefan Johansson]

On Mon, 21 Feb 2022 11:33:24 GMT, Swati Sharma <duke at openjdk.java.net> wrote:

>> test/hotspot/jtreg/runtime/os/TestExplicitPageAllocation.java line 188:
>> 
>>> 186: 
>>> 187:         for (int i = index;i >= vmPageSizeIndex;i--) {
>>> 188:             if(pageSizes[i]) {
>> 
>> An alternative to this would be to have something like `ArrayList<PageSizeConfig>` to which we only add the configured page sizes. And `PageSizeConfig` would hold both the page size and the number of pages configured for this size. I think that would be slightly easier to follow.
>
> Page Count array size increased to 64 this will fix the reported issue and should be sufficient to handle all the page sizes for 64 bit platforms.

Yes, I saw the fix and it will work. I still think a solution like the one I proposed would be both more robust and easier to maintain, but I you prefer this approach I won't block it.

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PR: https://git.openjdk.java.net/jdk/pull/7326