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

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Message-ID: <1335884353.13683.144.camel@twins>
Date:	Tue, 01 May 2012 16:59:13 +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 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.
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