Messages in this thread | | | Subject | Re: pinning down user memory... | Date | Thu, 23 Sep 1999 23:53:23 +0100 (BST) | From | Alan Cox <> |
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> anyone in the list has had requirement to pin user memory pages down in > linux? i have had other ways in > solaris/nt to do this. but have not known the right way to lock pages down > under linux.
Normally you map kernel pages into user space for this. A simple example is the dmaram driver in 2.3.18ac, or the sound drivers - which map a chunk of kernel buffer into user space and give uses access to a buffer being used for DMA.
2.3.x adds stuff for locking down page groups for direct I/O but that isn't in standard 2.2 kernels
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