Messages in this thread | | | Date | Thu, 2 Apr 2015 21:09:10 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 2/3] context_tracking: Inherit TIF_NOHZ through forks instead of context switches |
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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?
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