FT> If you add a feature to notify I/O completion of user space (I FT> think this feature is necessary for other reasons too), user-space FT> programs can take care about this easily. I prefer the FT> dm-userspace kernel module to just perform I/Os according to FT> requests from user space. I have thought about this approach before, and perhaps it makes sense, as it will simplify the kernel module and move all of the CoW-like behavior back out to userspace. In order for this to perform well, we will need to use AIO, right? I would be interested to hear feedback from others on this list about this particular point. -- Dan Smith IBM Linux Technology Center Open Hypervisor Team email: danms@xxxxxxxxxx
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