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vfs: flip deferred_inact to atomic

Description

vfs: flip deferred_inact to atomic

Turns out it is very rarely triggered, making a per-cpu
counter a waste.

Examples from real life boxes:
uptime counter
135 days 847
138 days 2190
141 days 1

Details

Provenance
mjgAuthored on Mar 25 2023, 1:31 PM
Parents
rGe5eb1d298f65: vfs: replace some spelled out VNASSERTs with VNPASS
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