f09cbea31a
When a reserve of free items is configured for a zone, the reserve must not be reclaimed under memory pressure. Modify keg_drain() to simply respect the reserved pool. While here remove an always-false uk_freef == NULL check (kegs that shouldn't be drained should set _NOFREE instead), and make sure that the keg_drain() KTR statement does not reference an uninitialized variable. Reviewed by: alc, rlibby Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D26772