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This allows to reduce memory waste by letting UMA to put multiple small buffers into one memory page slab. The page sharing means that UMA may not be able to free memory page when some of buffers are freed, but alternatively memory used by that buffer would just be wasted from the beginning. This change follows alike change in ZoL, but unlike Linux (according to my understanding of it from comments) FreeBSD never shares slabs bigger then one memory page, so this should be even less invasive then there. MFC after: 2 weeks Sponsored by: iXsystems, Inc. |
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