mikemccand commented on PR #16145:
URL: https://github.com/apache/lucene/pull/16145#issuecomment-6473375486

   It's too bad we don't have a low-overhead way to know that a given IO was 
blocked by major or minor page fault, way up in javaland.  Then we could be 
more informed about when to re-test (call `mincore`) for cold pages.


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