Query on mechanisms to communicate between kernel modules in Linux

[Tobin C. Harding]

On Sat, Feb 10, 2018 at 10:30:36PM +0530, Neil Thomas wrote:
> Thanks a lot. I will try out this.

Please don't top post.  It upsets people.

Good luck,
Tobin.

> 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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> > > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
> > >
> >

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