Query on mechanisms to communicate between kernel modules in Linux

[valdis.kletnieks at vt.edu]

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.

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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