I am looking for a way to synchronize a kernel driver and some user-land code (without any copy_to_user or polling on a mmap)
More explanation:
My user side code read some data in a shared mmap, but it needs to know when the data are ready from the driver I already try to use signals to schedule everything but performances are even lower than using a regular char device (with a copy_to user)
(Working on a 4.1.15 kernel)
Any idea ?
[EDIT] I trying to do it with msync now