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Re: Implementation of POSIX shared memory objects
yamt%mwd.biglobe.ne.jp@localhost (YAMAMOTO Takashi) wrote:
> > Here is the implementation of POSIX shared memory objects:
> > http://www.netbsd.org/~rmind/shm_memobj.diff
> > Please review.
> why did you choose to implement it in kernel?
After some thinking about this, I have few things to mention.
For many cases, it makes sense to dump this complexity out from the kernel,
and use file-system layer (with eg. tmpfs). However:
- It could not provide determinism for real-time systems.
- It would have significant overhead for embedded systems. High bandwidth and
performance is a requirement for POSIX shared memory.
- Similar bits of kernel functionality (and therefore some complexity) might
be needed if we plan to support POSIX typed memory objects.
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