data transfer from kernel to user space

[Tirtha Ghosh]

Use a shared memory between user space and kernel space.
The same physical memory can be translated as user-space virtual address as
well as kernel space.
See more about mmap, io_remap_pfn_range etc. and you will get an idea.

The main advantage with this u can avoid copying data between two spaces but
disadvantage associated is u need to request  a fixed memory chunk from
kernel for this purpose.


On Tue, Jul 12, 2011 at 10:09 AM, Amit Nagal <helloin.amit at gmail.com> wrote:

> Hi ,
>
> Normally we use copy_to_user  / copy_from_user api's to transfer data
> to/from user space from/to kernel space .
> Can i be suggested with any other  data transfer mechanism b/w kernel
> - user space for a char device ,
> which are much faster than copy_xxx  ?
> Regards
> Amit Nagal
>
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