On Wed, Apr 05, 2017 at 05:31:05PM -0700, Stephen Hemminger wrote: > On Sun, 02 Apr 2017 06:28:41 +0200 > Mike Galbraith <efa...@gmx.de> wrote: > > > Livelock can be triggered by setting kworkers to SCHED_FIFO, then > > suspend/resume.. you come back from sleepy-land with a spinning > > kworker. For whatever reason, I can only do that with an enterprise > > like config, my standard config refuses to play, but no matter, it's > > "Typical broken usage". > > > > (yield() should be rendered dead) > > The kernel is not normally built to have kworkers run at SCHED_FIFO. > The user has do some action to alter the process priorities. > > I classify this as user error. We don't support killing kworker threads > either.
PI can boost anybody to FIFO, all you need is to be holding a lock.
