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6033 arc_adjust() should search MFU lists for oldest buffer when adjusting MFU size Reviewed by: Saso Kiselkov <saso.kiselkov@nexenta.com> Reviewed by: Xin Li <delphij@delphij.net> Reviewed by: Prakash Surya <me@prakashsurya.com> Approved by: Matthew Ahrens <mahrens@delphix.com> References: https://www.illumos.org/issues/6033 https://github.com/illumos/illumos-gate/commit/31c46cf Ported-by: kernelOfTruth kerneloftruth@gmail.com Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3545