| Date | Wed, 19 Apr 2017 13:35:12 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 |
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On Wed, Apr 19, 2017 at 01:28:45PM +0200, Peter Zijlstra wrote: > > So the thing Maz complained about is because KVM assumes > synchronize_srcu() is 'free' when there is no srcu_read_lock() activity. > This series 'breaks' that.
Could've been call_srcu() instead. Looking at the code that triggers the sp->running case and we slow down. That is !running will queue and insta-complete the callback, resulting in done=true and no waiting.
> > I've not looked hard enough at the new SRCU to see if its possible to > re-instate that feature.
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