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    SubjectRe: [RFC PATCH v1 3/5] KVM: Add paravirt kvm_flush_tlb_others
    On 05/01/2012 06:36 PM, Peter Zijlstra wrote:
    > On Tue, 2012-05-01 at 18:31 +0300, Avi Kivity wrote:
    > > On 05/01/2012 05:59 PM, Peter Zijlstra wrote:
    > > > On Tue, 2012-05-01 at 15:12 +0300, Avi Kivity wrote:
    > > > > local_irq_save() is a stronger version or rcu_read_lock()
    > > >
    > > > Not so, local_irq_save() doesn't at all stop regular RCU grace periods,
    > > > things like preemptible rcu can be driven from rcu_read_unlock().
    > > >
    > > > Note that this is the reason call_rcu_sched() exists and is used in this
    > > > case.
    > >
    > > Ah, thanks for the correction. I'll read some more about the _sched
    > > variants.
    >
    > Basically:
    >
    > rcu_read_{,un}lock_sched() -- aka preempt_{en,dis}able()
    > call_rcu_sched()
    > synchronize_rcu_sched() -- aka synchronize_sched();
    >
    > Define an RCU variant where each cpu has to have scheduled at least once
    > to complete a grace period.

    Which was the original rcu implementation, until it got replaced by
    preemptible rcu, yes? I guess that was the source of my confusion.

    --
    error compiling committee.c: too many arguments to function



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