Re: [ANNOUNCE] 3.2.9-rt17

On Thu, 2012-03-08 at 23:20 +0100, Peter Zijlstra wrote:

and with rt-mutex having the equal priority lock stealing this reverts
to a plain test-and-set lock. There's only a tiny window in which A can
actually get the lock and that is hampered by B's cpu owning the
cacheline in exclusive mode.

I simply cannot see guaranteed progress here.

This can be easily fixed by not having the lateral steal when a lock has
a priority.

-- Steve