On Thu, May 03, 2012 at 02:37:42PM +0200, Ivo Sieben wrote:

Solved unnecessary schedule latency in the TTY layer when used in
realtime context:
The global "normal" spin lock that guards the line discipline
administration is replaced by a raw spin lock.

Why, what does this cause to have happen?  What's the difference here
that causes any speedups or latency fixes?

thanks,

greg k-h