Messages in this thread | | | Subject | Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation | From | Roland Dreier <> | Date | Mon, 25 Apr 2005 16:58:03 -0700 |
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Andrew> ug. What stops the memory from leaking if the process Andrew> exits?
Andrew> I hope this is a privileged operation?
I don't think it has to be privileged. In my implementation, the driver keeps a per-process list of registered memory regions and unpins/cleans up on process exit.
Andrew> It would be better to obtain this memory via a mmap() of Andrew> some special device node, so we can perform appropriate Andrew> permission checking and clean everything up on unclean Andrew> application exit.
This seems to interact poorly with how applications want to use RDMA, ie typically through a library interface such as MPI. People doing HPC don't want to recode their apps to use a new allocator, they just want to link to a new MPI library and have the app go fast.
- R.
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