On Thu, 14 Dec 2017 07:25:51 -0800 Tejun Heo <t...@kernel.org> wrote:
> > 3. Soft-lockups are still theoretically possible with Steven's > > approach. > > > > But it seems to be quite efficient in many real life scenarios, > > including Tetsuo's stress testing. Or am I wrong? > > AFAICS, Steven's approach doesn't fix the livelock that we see quite > often in the fleet where we don't have a safe context to keep flushing > messages. This isn't theoretical at all. You simply don't have a > safe context on the cpu to go to. I said I'd come back with a repro > case but haven't had a chance to yet. I'll try to do it before the > end of the year, but idk this is pretty obvious. Yes! Please create a reproducer, because I still don't believe there is one. And it's all hand waving until there's an actual report that we can lock up the system with my approach. -- Steve
