On Wed, Jul 01, 2015 at 12:05:21PM +0200, Peter Zijlstra wrote:
> On Tue, Jun 30, 2015 at 02:48:27PM -0700, Paul E. McKenney wrote:
> > rsp->gp_state = RCU_GP_WAIT_FQS;
> > ret = wait_event_interruptible_timeout(rsp->gp_wq,
> > + ((gf = READ_ONCE(rsp->gp_flags)) &
> > + RCU_GP_FLAG_FQS) ||
> > + (!READ_ONCE(rnp->qsmask) &&
> > + !rcu_preempt_blocked_readers_cgp(rnp)) ||
> > + rcu_exp_gp_seq_done(rsp->exp_rsp,
> > + rsp->gp_exp_snap),
> > + j);
> > rsp->gp_state = RCU_GP_DONE_FQS;
>
> How can the GP be done if we timed out or got interrupted?
If all the CPUs still blocking the grace period went idle, or in a
NO_HZ_FULL kernel, entered nohz_full userspace execution. Or, if
certain low-probability races happen, went offline.
Thanx, Paul
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