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KernelTrap: vmsplice() versus COW

Apr 21, 2006, 21:15 (0 Talkback[s])

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"While explaining the new splice() and tee() buffer management system calls, Linus Torvalds made reference to some possible future extensions. This included vmsplice(), a system call since implemented by Jens Axboe 'to basically do a 'write to the buffer', but using the reference counting and VM traversal to actually fill the buffer.' Reviewing the implications of using such a system call lead to a comparison with FreeBSD's ZERO_COPY_SOCKET which uses COW (copy on write)..."

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