jplevyak commented on PR #13893:
URL: https://github.com/apache/trafficserver/pull/13893#issuecomment-6380282365
> Time-based aging skips elapsed intervals and does not advance during
hit-only traffic, preserving stale popularity weights.
▎ - Skipped intervals: _decay_epochs() now advances one epoch for each
whole 30s interval that has passed, not one per check. The leftover partial
interval carries over to the next decay. The advance is
▎ capped at 32 epochs, which already clears any 32-bit hit count, so a
long idle period clears counts rather than wrapping.
▎ - Hit-only traffic: both get() and put() now check for elapsed
intervals, so a cache serving only hits still ages. Since decay is lazy (an
O(1) epoch bump, applied to each entry when it's next touched),
▎ the extra cost per get() is one clock_gettime.
▎
▎ A new unit test ages an entry through get() alone. It checks that 3.5
intervals give three halvings with the remainder carried over, and that 40
intervals clear the count.
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