From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Avi Kivity <avi@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>,
linux-kernel@vger.kernel.org, mtosatti@redhat.com,
kvm@vger.kernel.org
Subject: Re: RCU treating guest mode just like it does user-mode execution
Date: Wed, 17 Aug 2011 17:44:59 -0700 [thread overview]
Message-ID: <20110818004459.GQ2419@linux.vnet.ibm.com> (raw)
In-Reply-To: <4E4C5CBE.5040102@redhat.com>
On Wed, Aug 17, 2011 at 05:28:46PM -0700, Avi Kivity wrote:
> On 08/17/2011 05:25 PM, Paul E. McKenney wrote:
> >> >
> >> Wouldn't scheduling-clock interrupt kick vcpu out of a guest mode much
> >> earlier then 30 seconds?
> >
> >The scheduling-clock interrupt would happen, but I do not know whether
> >or not it would kick the vcpu out of guest mode in such a way that
> >would result in RCU thinking that the CPU has passed through a quiescent
> >state.
> >
>
> The result can only be one of
>
> reenter guest (and rcu_virt_note_context_switch)
> schedule()
> exit to userspace
Very good, thank you both for bearing with me on this!
Thanx, Paul
next prev parent reply other threads:[~2011-08-18 0:44 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-17 20:43 RCU treating guest mode just like it does user-mode execution Paul E. McKenney
2011-08-17 21:50 ` Gleb Natapov
2011-08-17 22:05 ` Paul E. McKenney
2011-08-17 23:55 ` Gleb Natapov
2011-08-18 0:25 ` Paul E. McKenney
2011-08-18 0:28 ` Avi Kivity
2011-08-18 0:44 ` Paul E. McKenney [this message]
2011-08-18 0:53 ` Avi Kivity
2011-08-18 0:44 ` Gleb Natapov
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