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Kdbus meets linux-kernel

Kdbus meets linux-kernel

Posted Nov 5, 2014 14:05 UTC (Wed) by cesarb (subscriber, #6266)
In reply to: Kdbus meets linux-kernel by riking
Parent article: Kdbus meets linux-kernel

So, it's the sender's decision whether to zero-copy, instead of the kernel's?

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Kdbus meets linux-kernel

Posted Nov 5, 2014 14:41 UTC (Wed) by dvdhrm (subscriber, #85474) [Link]

> So, it's the sender's decision whether to zero-copy, instead of the kernel's?

The sender needs to provide data in a way suitable for zero-copy. For kdbus, this means it has to be in a memfd. Whether the kernel passes this data around via the fd, or whether it inlines it into the receiver's buffer, is *not* controlled by the sender. So far, kdbus always passes data the same way it received it, though.


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