Query on mechanisms to communicate between kernel modules in Linux

[Neil Thomas]

Thanks a lot. I will try out this.

On 10-Feb-2018 2:08 PM, "Pintu Kumar" <pintu.ping at gmail.com> wrote:

> 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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>
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