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uma: Show the count of free slabs in each per-domain keg's sysctl tree

Description

uma: Show the count of free slabs in each per-domain keg's sysctl tree

This is useful for measuring the number of pages that could be freed
from a NOFREE zone under memory pressure.

MFC after: 1 week
Sponsored by: The FreeBSD Foundation

Details

Provenance
markjAuthored on Sep 17 2021, 4:13 PM
Parents
rG7fabaac2211e: rpc: Convert an SOLISTENING check to an assertion
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