Messages in this thread | | | Subject | Re: Kernel virtual memory? | Date | Fri, 8 Aug 1997 17:40:48 +0200 (MET DST) | From | (Rogier Wolff) |
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Benjamin C R LaHaise wrote: > shuffling pages around in memory. Any driver that needs to regularly > allocate dmable pages should really think about doing that at startup, > and just holding onto these flip buffers for its lifetime.
Any driver using DMA for performance reasons is not going to benefit from a flip buffer that the CPU needs to copy to provide for userspace page fragmentation.
Drivers should in the near future be able to DMA directly into userspace memory. We need to lock down the pages involved, and be able to send a "list of pages" for the driver to use.....
Roger.
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