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Use an atomic reference count for paging in progress so that callers do not

Description

Use an atomic reference count for paging in progress so that callers do not
require the object lock.

Reviewed by: markj
Tested by: pho (as part of a larger branch)
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D21311

Details

Committed
jeffAug 19 2019, 11:09 PM
Reviewer
markj
Differential Revision
D21311: Use atomics for paging in progress.
Parents
rS351240: Fix stylistic nit in r351239
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