On Wed, 2012-01-25 at 18:22 -0600, Sankara Muthukrishnan wrote:

I wonder why my test worked for priority 1 alone before (without this
fix) and I did not see any other threads using RT scheduler in the
system with priority 1 or 2.

It worked at priority 1 because ksoftirqd was also at priority 1.  The
user task can't preempt ksoftirqd, ksoftirqd does it's thing and rides
off into the sunset before the user task arrives at the bad idea spot.

	-Mike