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... operations1
Some systems partly avoid this data copying under certain conditions in a transparent manner, using page remapping and copy-on-write.
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... place2
As an optimization, I/O data can be modified in place if it is not currently shared.
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... entry3
Similar issues arise in file caches that are based on memory mapped files.
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... buffers4
A small amount of memory is required to hold mbuf structures.
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Peter Druschel
1999-01-05