On Thu, 18 Jan 2018, Peter Zijlstra wrote: > On Thu, Jan 18, 2018 at 10:02:25AM +0100, Thomas Gleixner wrote: > > > > 2) We can do a cond_resched() if not in atomic context and interrupts > > > > are > > > > enabled. > > > > > > I did try this before I went with touching softlockup watchdog approach. > > > The > > > problem is in_atomic() can't tell if it is in atomic context on > > > non-preempt > > > kernel. For preempt kernel, it is easy. > > > > Peter, can we do anything about that? > > Not really :/ Take for instance a spinlock on !PREEMPT, only the lock > variable is touched, preempt_count isn't. So we cannot know.
Fair enough.
