linux-kernel - Re: [RFC PATCH v1 3/5] KVM: Add paravirt kvm_flush_tlb

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Message-ID: <1335886921.13683.154.camel@twins>
Date:	Tue, 01 May 2012 17:42:01 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>, mingo@...e.hu,
	jeremy@...p.org, mtosatti@...hat.com, kvm@...r.kernel.org,
	x86@...nel.org, vatsa@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, hpa@...or.com
Subject: Re: [RFC PATCH v1 3/5] KVM: Add paravirt kvm_flush_tlb_others

On Tue, 2012-05-01 at 18:39 +0300, Avi Kivity wrote:

> >  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.

Indeed. The _sched RCU variant has the 'classic' RCU semantics.
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