Cache coherency handling in user space

[jagadeesh kumar]

Hi,

I am doing RDMA (InfiniBand) programming.


When network device and CPU are using  kernel buffer, then DMA
synchronisation APIs are to be used for maintaining cache coherency.
But in case of User space buffer there is no such provision provided for
user and data is always synchronised with cache copy. Please help me to
understand how cache coherency is maintained in user space.

Thanks,
Jagadeesh.
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