Messages in this thread | | | Date | Wed, 29 Sep 2021 21:11:15 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC][PATCH v2 08/11] context_tracking,rcu: Replace RCU dynticks counter with context_tracking |
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On Wed, Sep 29, 2021 at 11:37:01AM -0700, Paul E. McKenney wrote:
> > +void context_tracking_idle(void) > > +{ > > + atomic_add_return(CT_SEQ, &raw_cpu_ptr(&context_tracking)->seq); > > This is presumably a momentary idle.
> > notrace void rcu_momentary_dyntick_idle(void) > > { > > - int seq; > > - > > raw_cpu_write(rcu_data.rcu_need_heavy_qs, false); > > - seq = rcu_dynticks_inc(2); > > - /* It is illegal to call this from idle state. */ > > - WARN_ON_ONCE(!(seq & 0x1)); > > + context_tracking_idle(); > > rcu_preempt_deferred_qs(current); > > }
It's whatever that is. It increments the actual sequence count without modifying the state.
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