Query on mechanisms to communicate between kernel modules in Linux

[Pintu Kumar]

On Fri, Feb 9, 2018 at 12:52 AM, Neil Thomas <neilkt27 at gmail.com> wrote:
> Thanks, I will check it out.
>
> On 09-Feb-2018 12:50 AM, <valdis.kletnieks at vt.edu> wrote:
>>
>> On Thu, 08 Feb 2018 23:38:01 +0530, Neil Thomas said:
>>
>> > I am just a beginner. I have tried procfs, Netlink socket to communicate
>> > between user space and kernel space and it works fine.
>> >
>> > I am developing a monitoring utility to trace the VFS operation and find
>> > the frequency of VFS function calls. This monitoring utility runs in
>> > kernel
>> > space. We have to record the occurrence of each  VFS function calls
>> > (like
>> > vfs_open(), vfs_read()).  I don't know  which is best mechanism to
>> > report
>> > this VFS event to the monitoring utility.
>> >
>> > Could anyone please suggest the best mechanism to transfer data
>> > frequently
>> > between kernel modules.

You can also use ION (CONFIG_ION) or DMABUF (DMA_SHARED_BUFFER) buffer
sharing mechanism to share data between 2 drivers.
Check this:
https://www.kernel.org/doc/html/latest/driver-api/dma-buf.html
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/staging/android/ion?h=v4.15

>>
>> There's a perfectly good perf-based function trace facility that will
>> provide
>> this info to userspace.
>>
>> http://www.brendangregg.com/perf.html#StaticKernelTracing
>>
>
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