Re: [bisected] pre-3.16 regression on open() scalability

[Andi Kleen]

> OK.  What would you suggest instead?  If all we do is to revert the

Hang checker should have two timer phases:

Timer fires first time:
- Save context switch counter on that. Force a reschedule to some
work queue. Rearm timer

Timer fires again:
- Check reschedule count. If the reschedule count changed
it was a real hang, otherwise ignore.

-Andi
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