From [PATCH 0/0] A shared memory cache to perform better:
0/4: Actual memory cache implementation
These is the bulk of the work, these patches are still a bit rough at
the edges, grep for FIXMEs and TODOs and you'll see some plumbing (for
example configure options in sssd to set expiration time and cache sizes
are missing and are still harcoded).
Simo.
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Simo Sorce * Red Hat, Inc * New York