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Don't call vm_reserv_free_page() if PG_PCPU_CACHE is set.
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Authored by markj on Jul 4 2019, 7:28 PM.
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Details

Summary

Pages allocated from a per-CPU cache cannot belong to a reservation.
So, as an optimization, avoid the call when we know that the page was
allocated from a per-CPU cache.

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Buildable 25204
Build 23884: arc lint + arc unit