On 04/02, Peter Zijlstra wrote: > > On Thu, Apr 02, 2015 at 07:39:24PM +0200, Frederic Weisbecker wrote: > > TIF_NOHZ is used by context_tracking to force syscall slow-path on every > > task in order to track userspace roundtrips. As such, it must be set on > > all running tasks. > > > > It's currently explicitly inherited through context switches. There is > > no need to do it on this fast-path though. The flag could be simply > > set once for all on all tasks, whether they are running or not. > > > > Lets do this by setting the flag to init task on early boot and let it > > propagate through fork inheritance. > > > > One must ask, what's the point of the flag if everybody must always have > it set?
To force the slow path in the syscall paths. Unfortunately it is not easy to change this ... Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
