goankur commented on PR #16145:
URL: https://github.com/apache/lucene/pull/16145#issuecomment-6588706007

   @pauldoo agreed.
   
   My [cached-then-evicted rerank 
test](https://github.com/apache/lucene/pull/16145#issuecomment-6476254463) 
shows where it would pay off: ~90% of the major faults were on .vex, which is 
never prefetched, yet each one woke every confident file. 
   
   At 58 probes per JVM hot and no latency cost under eviction, those wake-ups 
were cheap though. Since perf_event_open would still need a fallback for 
locked-down hosts, I'd keep `getrusage` as the base and treat per-file 
attribution as a later opt-in.


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