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KernelTrap: vmsplice() versus COW

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


Re-Imagining Linux Platforms to Meet the Needs of Cloud Service Providers

"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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