Yes, I know. But I rolled my own QNX clone and I figured it would be neat to do this transparently rather than that the application has to code it up explicitly. This puts some constraints on where messages can be located though and that's an interesting problem to solve if you want to do it entirely without overhead.
I have a general distaste for transparent policies, which I always find to fall short for some use case. In this case, the sender would know best what to do with their message. Moreover, for small buffers, page remapping won't be an optimization. I recommend reflecting this as an alternative send interface.
The lower a transparent policy lies in the OS, the worse it contorts the system. Even mechanisms necessarily constrain policy, if only slightly. I strongly believe that microkernels will only be improved by adhering ever closer to true minimality. If backwards compatibility is important, put the policy in a library. But I think transparent policies are generally advisable only when user feedback indicates benefit.
If you want your send/receive/reply mechanism to work transparently across a network then you have already made many such decisions and likely this one will just appear as an optimization in case both client and server are local.
Yes, I know. But I rolled my own QNX clone and I figured it would be neat to do this transparently rather than that the application has to code it up explicitly. This puts some constraints on where messages can be located though and that's an interesting problem to solve if you want to do it entirely without overhead.
I have a general distaste for transparent policies, which I always find to fall short for some use case. In this case, the sender would know best what to do with their message. Moreover, for small buffers, page remapping won't be an optimization. I recommend reflecting this as an alternative send interface.
The lower a transparent policy lies in the OS, the worse it contorts the system. Even mechanisms necessarily constrain policy, if only slightly. I strongly believe that microkernels will only be improved by adhering ever closer to true minimality. If backwards compatibility is important, put the policy in a library. But I think transparent policies are generally advisable only when user feedback indicates benefit.
If you want your send/receive/reply mechanism to work transparently across a network then you have already made many such decisions and likely this one will just appear as an optimization in case both client and server are local.
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