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@xxxxxxxxx> wrote: > > > On Fri, Feb 9, 2018 at 12:52 AM, Neil Thomas <neilkt27@xxxxxxxxx> wrote: > > > Thanks, I will check it out. > > > > > > On 09-Feb-2018 12:50 AM, <valdis.kletnieks@xxxxxx> 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 > > >> > > > > > > _______________________________________________ > > > Kernelnewbies mailing list > > > Kernelnewbies@xxxxxxxxxxxxxxxxx > > > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > > > > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
