linux-kernel - Re: [PATCH -v3 0/6] rcu,nohz,kvm: use RCU extended quiescent state when running KVM guest

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Date:	Mon, 09 Feb 2015 22:03:08 -0500
From:	Rik van Riel <riel@...hat.com>
To:	paulmck@...ux.vnet.ibm.com,
	Frederic Weisbecker <fweisbec@...il.com>
CC:	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"mtosatti@...hat.com" <mtosatti@...hat.com>,
	"borntraeger@...ibm.com" <borntraeger@...ibm.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"lcapitulino@...hat.com" <lcapitulino@...hat.com>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>
Subject: Re: [PATCH -v3 0/6] rcu,nohz,kvm: use RCU extended quiescent state
 when running KVM guest

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On 02/09/2015 10:01 PM, Paul E. McKenney wrote:
> On Tue, Feb 10, 2015 at 02:44:17AM +0100, Frederic Weisbecker
> wrote:
>> On Mon, Feb 09, 2015 at 08:22:59PM -0500, Rik van Riel wrote:
>>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
>>> 
>>> On 02/09/2015 08:15 PM, Will Deacon wrote:
>>>> Hi Rik,
>>>> 
>>>> On Mon, Feb 09, 2015 at 04:04:38PM +0000, riel@...hat.com
>>>> wrote:
>>>>> Apologies to Catalin and Will for not fixing up ARM. I am
>>>>> not familiar with ARM assembly, and not sure how to pass a
>>>>> constant argument to a function from assembly code on ARM
>>>>> :)
>>>> 
>>>> It's a bit of a faff getting enum values into asm -- we
>>>> actually have to duplicate the definitions using #defines to
>>>> get at the constants. Perhaps it would be cleaner to leave 
>>>> context_tracking_user_{enter,exit} intact as C wrappers
>>>> around context_tracking_{enter,exit} passing the appropriate
>>>> constant? That way we don't actually need to change the arch
>>>> code at all.
>>> 
>>> If Paul and Frederic have no objections, I would be happy to do
>>> that.
>>> 
>>> Paul, Frederic?
>> 
>> Sure, that's fine by me.
> 
> And if it is fine by Frederic, it is fine by me!

I'll send a new series tomorrow that addresses Will's concern,
as well as Paulo's latest suggestions.

- -- 
All rights reversed
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